Relevant bibliographies by topics / Polyanionic materials

Academic literature on the topic 'Polyanionic materials'

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Published: 6 September 2023

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Journal articles on the topic "Polyanionic materials"

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Marshall, Kayleigh L., Qianlong Wang, Hannah S. I. Sullivan, and Mark T. Weller. "Synthesis and structural characterisation of transition metal fluoride sulfates." Dalton Transactions 45, no. 21 (2016): 8854–61. http://dx.doi.org/10.1039/c6dt00582a.

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Eleven new transition metal fluorosulfate structures have been synthesised and structurally characterised. These materials show a variety of polyanionic motifs ranging from discrete [TiF4(SO4)2]4− polyanions (right) to complex layers.
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Sichevych, Olga, Yurii Prots, Walter Schnelle, Frank R. Wagner, and Yuri Grin. "Polycation–Polyanion Architecture of the Intermetallic Compound Mg3−xGa1+xIr." Molecules 27, no. 3 (January 20, 2022): 659. http://dx.doi.org/10.3390/molecules27030659.

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Mg3−xGa1+xIr (x = 0.05) was synthesized by direct reaction of the elements in welded tantalum containers at 1200 °C and subsequent annealing at 500 °C for 30 days. Its crystal structure represents a new prototype and was determined by single-crystal technique as follows: space group P63/mcm, Pearson symbol hP90, Z = 18, a = 14.4970(3) Å, c = 8.8638(3) Å. The composition and atomic arrangement in Mg3GaIr do not follow the 8–N rule due to the lack of valence electrons. Based on chemical bonding analysis in positional space, it was shown that the title compound has a polycationic–polyanionic organization. In comparison with other known intermetallic substances with this kind of bonding pattern, both the polyanion and the polyanion are remarkably complex. Mg3−xGa1+xIr is an example of how the general organization of intermetallic substances (e.g., formation of polyanions and polycations) can be understood by extending the principles of 8–N compounds to electron-deficient materials with multi-atomic bonding.
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Werwein, Anton, Christopher Benndorf, Marko Bertmer, Alexandra Franz, Oliver Oeckler, and Holger Kohlmann. "Hydrogenation Properties of LnAl2 (Ln = La, Eu, Yb), LaGa2, LaSi2 and the Crystal Structure of LaGa2H0.71(2)." Crystals 9, no. 4 (April 3, 2019): 193. http://dx.doi.org/10.3390/cryst9040193.

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Many Zintl phases take up hydrogen and form hydrides. Hydrogen atoms occupy interstitial sites formed by alkali or alkaline earth metals and / or bind covalently to the polyanions. The latter is the case for polyanionic hydrides like SrTr2H2 (Tr = Al, Ga) with slightly puckered honeycomb-like polyanions decorated with hydrogen atoms. This study addresses the hydrogenation behavior of LnTr2, where the lanthanide metals Ln introduce one additional valence electron. Hydrogenation reactions were performed in autoclaves and followed by thermal analysis up to 5.0 MPa hydrogen gas pressure. Products were analyzed by powder X-ray and neutron diffraction, transmission electron microscopy, and NMR spectroscopy. Phases LnAl2 (Ln = La, Eu, Yb) decompose into binary hydrides and aluminium-rich intermetallics upon hydrogenation, while LaGa2 forms a ternary hydride LaGa2H0.71(2). Hydrogen atoms are statistically distributed over two kinds of trigonal-bipyramidal La3Ga2 interstitials with 67% and 4% occupancy, respectively. Ga-H distances (2.4992(2) Å) are considerably longer than in polyanionic hydrides and not indicative of covalent bonding. 2H solid-state NMR spectroscopy and theoretical calculations on Density Functional Theory (DFT) level confirm that LaGa2H0.7 is a typical interstitial metallic hydride.
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Barpanda, Prabeer, Laura Lander, Shin-ichi Nishimura, and Atsuo Yamada. "Polyanionic Insertion Materials for Sodium-Ion Batteries." Advanced Energy Materials 8, no. 17 (April 20, 2018): 1703055. http://dx.doi.org/10.1002/aenm.201703055.

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Wu, Honglun, Yiqing Chen, Tianzhuo Wen, Long Chen, Xiangjun Pu, and Zhongxue Chen. "Advances in Vanadium-Redoxed Polyanions for High-Voltage Sodium-Ion Batteries." Batteries 9, no. 1 (January 12, 2023): 56. http://dx.doi.org/10.3390/batteries9010056.

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Large-scale energy storage using sodium ion batteries (SIBs) as a hub for the conversion of renewable energy has become a topic of great importance. However, the application of SIBs is hindered by low energy density arising from inferior capacity and operation voltage. In this regard, vanadium-based phosphate polyanions with multiple valence changes (III–V), high redox potential, abundant resources, spacious frame structure, and remarkable thermal stability are promising avenues to address this dilemma. In this review, following the principle of electronic structure and function relationship, we summarize the recent progress in phosphates, pyrophosphates, fluorophosphates, and mixed polyanions of vanadium-centered polyanionic materials for SIBs. This review may provide comprehensive understanding and guidelines to further construct high performance, low-cost sodium-ion batteries.
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Guijarro, Albert, and Miguel Yus. "Polychlorinated materials as a source of polyanionic synthons." Tetrahedron 52, no. 5 (January 1996): 1797–810. http://dx.doi.org/10.1016/0040-4020(95)01014-9.

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Singh, Shashwat, Shubham Lochab, Lalit Sharma, Valérie Pralong, and Prabeer Barpanda. "An overview of hydroxy-based polyanionic cathode insertion materials for metal-ion batteries." Physical Chemistry Chemical Physics 23, no. 34 (2021): 18283–99. http://dx.doi.org/10.1039/d1cp01741a.

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Sharma, Lalit, and Arumugam Manthiram. "Polyanionic insertion hosts for aqueous rechargeable batteries." Journal of Materials Chemistry A 10, no. 12 (2022): 6376–96. http://dx.doi.org/10.1039/d1ta11080b.

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Zhang, Huang, Xiaoping Tan, Huihua Li, Stefano Passerini, and Wei Huang. "Assessment and progress of polyanionic cathodes in aqueous sodium batteries." Energy & Environmental Science 14, no. 11 (2021): 5788–800. http://dx.doi.org/10.1039/d1ee01392k.

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An assessment of the latest ground-breaking advances of polyanionic materials as cathodes for aqueous sodium-ion batteries is given. Future research directions and challenges on material development are provided.
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Bianchini, M., J. M. Ateba-Mba, P. Dagault, E. Bogdan, D. Carlier, E. Suard, C. Masquelier, and L. Croguennec. "Multiple phases in the ε-VPO4O–LiVPO4O–Li2VPO4O system: a combined solid state electrochemistry and diffraction structural study." J. Mater. Chem. A 2, no. 26 (2014): 10182–92. http://dx.doi.org/10.1039/c4ta01518e.

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Dissertations / Theses on the topic "Polyanionic materials"

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Kim, Jae Chul Ph D. Massachusetts Institute of Technology. "Design of novel lithium storage materials with a polyanionic framework." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/88373.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, February 2014.
Cataloged from PDF version of thesis. "February 2014." Page 206 blank.
Includes bibliographical references (pages 195-205).
Lithium ion batteries for large-scale applications demand a strict safety standard from a cathode material during operating cycles. Lithium manganese borate (LiMnBO₃) that crystallizes into a hexagonal or monoclinic framework is one prominent polyanionic compound to cope with such requirement since it can possess high safety and high energy density simultaneously, without trading one for the other, theoretically. However, the hexagonal phase was nothing but a disregarded composition due to its negligible Li intercalation capacity. In contrast, the monoclinic LiMnBO₃ compound exhibited much more electrochemical activity than the hexagonal polymorph. In this thesis work, the discharge capacity of 100 mAh g 1 with acceptable capacity retention was achieved by simple optimization. The different electrochemical behaviors between them were understood in relation to their structural difference as it affects the Li migration barrier, structural stability of Li-deficient states, and even particle morphology. However, although promising, monoclinic LiMnBO₃ needed further improvement in terms of the achievable capacity and cyclability. Electrochemical analysis showed that the limited capacity of LiMnBO₃ mostly originated from transport limitation, a hindered Li migration through the one-dimensional diffusion channel. It also struggled from the phase decomposition and Mn dissolution due to the instability of the delithiated state, which led to gradual capacity fading in prolonged cycles. As an effective materials design strategy to overcome such limitations, systematic substitution of transition metal elements was proposed. To increase achievable capacity, Mn was partially substituted by Fe. Also, to fortify the structural integrity, Mg replaced Mn. In order to obtain both improved capacity and cyclability, Fe and Mg are co-doping led to an optimized composition. Prepared by cold-isostatic pressing, LiMg₀.₁Mn₀.₅Fe₀.₄4BO₃ showed near theoretical capacity of 200 mAh g-¹ with much improved capacity retention. These newly established materials outperformed most of the polyanionic cathode compounds. Therefore, it can be concluded a new promising candidate as a Li storage material has been developed through this thesis research.
by Jae Chul Kim.
Ph. D.
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Matts, Ian Lawrence. "Multi-redox active polyanionic cathodes for alkali-ion batteries." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104108.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2016.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 121-139).
In order for alkali-ion batteries to gain widespread adoption as the energy storage technology of choice for transportation and grid applications, their energy must be improved. One key step towards this necessary improvement is the development of new battery cathode materials. In this thesis, two classes of polyanionic materials are examined as candidate cathodes for alkali-ion batteries: Li-containing carbonophosphates for Li-ion batteries and Na-containing fluorophosphates for Na-ion batteries. High-throughput ab initio calculations have previously identified carbonophosphates as a new class of polyanionic cathode materials. Li₃MnCO₃PO₄ is the most promising candidate due to its high theoretical capacity, predicted multi-redox activity, and ideal voltage range. However, a major limitation of this material is its poor cyclability and experimental capacity. In this work Li₃Fe₀.₂Mn₀.₈CO₃PO₄ is synthesized to combine the high theoretical capacity of Li₃MnCO₃PO₄ with the high cyclability of Li₃FeCO₃PO₄. Li₃Fe₀.₂Mn₀.₈CO₃PO₄ outperforms both Li₃MnCO₃PO₄ and Li₃FeCO₃PO₄, showing a reversible capacity of 105 mAh/g with little capacity fade over 25 cycles. However, poor thermodynamic stability of these compounds, particularly at partially delithiated compositions, prevents carbonophosphates from being seriously considered as a viable Li-ion cathode. Fluorophosphate cathodes are currently one of the most promising polyanionic sodium-ion battery cathodes due to their high energy density and cyclability. To further improve fluorophosphate cathodes, their capacity must be increased by using Na sites that had not been accessed prior to this work. In this thesis, reversible electrochemical Na+ insertion into Na₃V₂(PO₄)₂F₃ is demonstrated. To further improve fluorophosphate cathodes by using its newly discovered insertion capacity, novel Na₃[M]₂(PO₄)₂F₃ cathodes, with {M = Fe, Ti, V}, are synthesized and evaluated. Seeing no improvement, the question of what specific mechanism limits fluorophosphate cathode capacity is addressed. For this, the synthesis, electrochemical characterization, and computational examination of a specifically designed test system, Na₃GaV(PO₄)₂F₃, is reported. This leads to the conclusion that large diffusion barriers at high sodiations impose a kinetic limit on Na+ insertion in fluorophosphate cathodes, as opposed to limits in transition metal redox activity.
by Ian Lawrence Matts.
Ph. D.
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Zhang, Huang [Verfasser], and S. [Akademischer Betreuer] Passerini. "Polyanionic cathode materials for sodium-ion batteries / Huang Zhang ; Betreuer: S. Passerini." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1178528162/34.

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Gardiner, Grahame. "Atomistic simulation of polyanion cathode materials for lithium batteries." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564008.

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Rechargeable lithium-ion batteries are attractive candidates for implementation into new large-scale energy storage applications, such as hybrid and electric vehicles, due to their high energy density. Modern atomistic modelling techniques can provide valuable insights into the fundamental defect and ion transport properties of electrode materials at the atomic scale, which are essential for a full understanding of lithium battery function. In this thesis, three types of polyanion materials, for use as alternative cathodes in lithium batteries, are examined using such computational techniques. Firstly, the mixed-metal phosphate material LiFe0:5Mn0:5PO4 is investigated. The intrinsic defect type in this olivine-structured material with the lowest energy is the cation antisite defect, in which Li+ and Fe2+/Mn2+ ions exchange positions. Lithium ion diusion occurs down one-dimensional b-axis channels following a curved path in accord with experiment. Migration energies for Fe2+ and Mn2+ antisite cations on Li+ sites suggest that such defects will impede bulk Li+ mobility in LiFe0:5Mn0:5PO4. Secondly, ion conduction paths through the tavorite structures of recently discovered LiFeSO4F and NaFeSO4F are investigated by a combination of static lattice and molecular dynamics simulation techniques. The results indicate that LiFeSO4F is eectively a three-dimensional (3D) lithium-ion conductor with an activation energy of 0:4 eV for long-range diusion, which involves a combination of zigzag paths through [100], [010], and [111] tunnels in the open tavorite lattice. In contrast, for Na+ migration in NaFeSO4F, only one direction ([101]) is found to have a relatively low activation energy (0.6 eV). This leads to a diffiusion coecient that is more than six orders of magnitude lower than in any other direction, suggesting that NaFeSO4F is a one-dimensional (1D) Na-ion conductor. Finally, the defect and diffiusion properties of LiFe0:5Mn0:5SO4F, which exhibits a complex triplite structure in which the cation (M) sites are shared by Li+, Fe2+ and Mn2+ ions, are examined. Low activation energies (6 0:45 eV) are found for several nearest-neighbour jumps between lithium sites which make up a 3D network of long-range migration pathways. However, due to cation site sharing, coherent long-range diusion may be blocked by Fe2+ and Mn2+ ions which would aect the rate capability of this material.
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Glass, Hugh. "Borate polyanion-based systems as Li- and Mg-ion cathode materials." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/264940.

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The aim of this thesis is to investigate pyroborates, M2B2O5, and orthoborates, M3(BO3)2, where M = Mg, Mn, Co, Ni, as high capacity and high voltage Li- and Mg-ion cathode materials. We explore the layered orthoborates (M3(BO3)2 which, to our knowledge, have not been previously considered as Li- or Mg-ion cathodes, perhaps due to the lack of Li analogues. Structural analysis shows that mixed metal orthoborates form a solid solution, with cation order driven by the presence of directional d orbitals. Electrochemical studies show that Mg can be removed from the structure and replaced with Li in a 1:1 ion ratio. In the compound Mg2Mn(BO3)2 removal of 1 Mg is achieved giving a capacity of 209.9 mAh g 1. The pyroborates (M2B2O5) are an unexplored family of borate polyanions, which offer higher theoretical capacities and voltages than LiMBO3 due to their more condensed frameworks. There are no known Li containing pyroborates, we use electrochemical ion exchange, with the aim of replacing each Mg with 2 Li to form LixMB2O¬5. The stoichiometry can be varied to alter the redox couple utilised and the Mg available for removal. MgxM2-xB2O5 has been synthesised for M = Mn, Co, Fe and Ni and all forms have been shown to form a solid solution with cation ordering over the two M sites. In MgMnB2O5 we have shown that Mg can be fully removed while retaining the pyroborate structure. Subsequently up to 1.1 Li can be inserted giving discharge capacities of 240 mAhg-1 above 1.5 V. After 100’s of cycles 2 Li can be reversibly cycled. The insertion of Li has been confirmed by 7Li NMR and the oxidation state changes in Mn have been investigated by SQUID magnetometry and XANES spectroscopy. Electrochemical studies in materials where M = Fe, Co, and Ni show high voltage plateaus ( > 3.5 V) but limited capacity at room temperature. Increased temperatures improves cycling, with Co and Fe based compounds reaching full theoretical capacities ( > 200 mAhg-1). As Mg can be removed from the structure, the pyroborates could be of interest in Mg-ion batteries, which offer benefits in energy density, cost, and safety. Mg-ion battery research is still in its infancy, therefore here we develop methods to reliably test Mg-ion cathodes and electrolytes. We demonstrate that despite significant side reactions, Mg can be reversibly cycled in the MgMnB2O5 system in a full Mg-ion cell, showing that pyroborates are a promising family of materials for high capacity, high voltage Mg-ion cathodes. This study shows that the pyroborates and orthoborates are a promising family of materials for Li- and Mg-ion cathodes, with the light weight structure leading to high specific capacities. The ability to replace Mg for Li in polyanion materials without disrupting the crystal structure opens a new way to search for novel, high energy density, Li-ion cathodes.
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MASESE, TITUS NYAMWARO. "Iron-based Polyanion Cathode Materials for High-Energy Density Rechargeable Lithium and Magnesium Batteries." Kyoto University, 2015. http://hdl.handle.net/2433/199395.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(人間・環境学)
甲第19071号
人博第724号
新制||人||174(附属図書館)
26||人博||724(吉田南総合図書館)
32022
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 内本 喜晴, 教授 田部 勢津久, 准教授 藤原 直樹
学位規則第4条第1項該当
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Siegfried, Adam. "Exploratory synthesis of polyanion-based open-framework solids as potential candidates for cathode material applications." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1211391125/.

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Mourad, Abdel Hamid. "Comportement photo-oxydant d'heteropolytungstates de structure de keggin." Paris 6, 1987. http://www.theses.fr/1987PA066545.

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Nguyen, Long Hoang Bao. "Cristallochimie d’oxyphosphates fluorés de vanadium : De l’étude de leur structure à leurs performances en batteries Na-ion." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0356.

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Les batteries Na-ion se développent comme une nouvelle alternative aux batteries Li-ion. Parmi le grand nombre de matériaux déjà étudiés à l’électrode positive, Na3V2(PO4)2F3 et Na3(VO)2(PO4)2F sont les plus performants grâce à des capacités théoriques élevées, des potentiels d’extraction des ions Na+ élevés, et la stabilité de la structure lors de cyclages longues durées. De plus, la structure et les propriétés électrochimiques des matériaux Na3V2(PO4)2F3 et Na3(VO)2(PO4)2F peuvent être modulées par un effet de substitution cationique ou anionique. Ce travail de thèse a pour but d’explorer la cristallochimie de nouveaux matériaux dérivés de Na3V2(PO4)2F3 et Na3(VO)2(PO4)2F. Dans un premier temps, différentes modes de synthèse (voies tout solide, céramique assistée par sol-gel, et broyage mécanique) sont explorées pour réaliser des substitutions cationiques et anioniques. La structure tridimensionnelle à longue distance de ces matériaux est déterminée par diffraction des rayons X synchrotron, tandis que les environnements locaux sont ensuite décrits finement en combinant des techniques de spectroscopies (résonance magnétique nucléaire à l’état solide, absorption des rayons X, et infra-rouge) dont l’interprétation est appuyée par des calculs théoriques. Les diagrammes de phases et les processus d’oxydoréduction impliqués lors des réactions de dés-intercalation et de ré-intercalation des ions Na+ de la structure hôte sont étudiés pour chacune des compositions, operando (cad. lors du fonctionnement de la batterie) en diffraction et absorption des rayons X synchrotron. Une compréhension des mécanismes structuraux et redox impliqués au cours du cyclage permet d’identifier les limitations de ces phases et de nous guider pour proposer des nouveaux matériaux dérivés présentant de meilleures performances
Na-ion batteries are currently developed as a future alternative to the conventional Li-ion batteries. Among all the polyanion materials studied as positive electrodes for Na-ion batteries, Na3V2(PO4)2F3 and Na3(VO)2(PO4)2F are the two promising compositions thanks to their high theoretical capacity, high Na+-extraction voltage, and especially the high stability of their structural framework upon long-term cycling. Furthermore, the crystal structure and the electrochemical properties of these materials can be greatly modulated through an effect of cationic or anionic substitution. This PhD work aims at exploring the diversity in crystal chemistry of Na3V2(PO4)2F3, Na3(VO)2(PO4)2F and their derivatives obtained through different synthesis methods. The three-dimensional long range crystal structure of these phases is determined by the use of high resolution synchrotron X-ray powder diffraction whereas their local atomic and electronic structures are investigated through a combination of solid-state nuclear magnetic resonance supported by first-principles theoretical calculations, synchrotron X-ray absorption spectroscopy and infrared spectroscopy. Thereafter, the phase diagram and the redox processes involved in the Na+ de-intercalation and intercalation are established thanks to operando synchrotron X-ray diffraction and absorption. An in-depth understanding on the crystal structure as well as the involved redox couples for each composition helps us to determine the limitations of these vanadium fluorinated oxy-phosphates and sheds light to the development of new materials with better performance based on their structure
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"High Pressure and High Temperature Study on Lithium carbide (Li2C2) and Calcium carbide (CaC2): An attempt to make a novel polyanionic form of Carbon." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.15232.

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abstract: Carbon lacks an extended polyanionic chemistry which appears restricted to carbides with C4-, C22-, and C34- moieties. The most common dimeric anion of carbon atoms is C22- with a triple bond between the two carbon atoms. Compounds containing the dicarbide anion can be regarded as salts of acetylene C2H2 (ethyne) and hence are also called acetylides or ethynides. Inspired by the fact that molecular acetylene undergoes pressure induced polymerization to polyacetylene above 3.5 GPa, it is of particular interest to study the effect of pressure on the crystal structures of acetylides as well. In this work, pressure induced polymerization was attempted with two simple metal acetylides, Li2C2 and CaC2. Li2C2 and CaC2 have been synthesized by a direct reaction of the elements at 800ºC and 1200ºC, respectively. Initial high pressure investigations were performed inside Diamond anvil cell (DAC) at room temperature and in situ Raman spectroscopic measurement were carried out up to 30 GPa. Near 15 GPa, Li2C2 undergoes a transition into a high pressure acetylide phase and around 25 GPa this phase turns amorphous. CaC2 is polymorphic at ambient pressure. Monoclinic CaC2-II does not show stability at pressures above 1 GPa. Tetragonal CaC2-I is stable up to at least 12 GPa above which possibly a pressure-induced distortion occurs. At around 18 GPa, CaC2 turns amorphous. In a subsequent series of experiments both Li2C2 and CaC2 were compressed to 10 GPa in a multi anvil (MA) device and heated to temperatures between 300 and 1100oC for Li2C2, and 300°C to 900°C for CaC2. The recovered products were analyzed by PXRD and Raman spectroscopy. It has been observed that reactions at temperature higher than 900°C were very difficult to control and hitherto only short reaction times could be applied. For Li2C2, a new phase, free of starting material was found at 1100°C. Both the PXRD patterns and Raman spectra of products at 1100oC could not be matched to known forms of carbon or carbides. For CaC2 new reflections in PXRD were visible at 900ºC with the starting material phase.
Dissertation/Thesis
M.S. Chemistry 2012
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Book chapters on the topic "Polyanionic materials"

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Okada*, Shigeto, and Jun-ichi Yamaki. "Polyanionic Cathode-Active Materials." In Lithium-Ion Batteries, 1–11. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-34445-4_9.

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Julien, Christian, Alain Mauger, Ashok Vijh, and Karim Zaghib. "Polyanionic Compounds as Cathode Materials." In Lithium Batteries, 201–68. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-19108-9_7.

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Barpanda, P., and J. M. Tarascon. "Fluorine-Based Polyanionic Compounds for High-Voltage Electrode Materials." In Lithium Batteries, 127–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118615515.ch7.

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Li, Biao, Huijun Yan, Jin Ma, Pingrong Yu, Dingguo Xia, Weifeng Huang, Wangsheng Chu, and Ziyu Wu. "Polyanion-Modified Li-Rich Manganese-Based Layered Materials." In Studies on Anionic Redox in Li-Rich Cathode Materials of Li-Ion Batteries, 35–54. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2847-3_3.

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Wu, X. B., X. H. Wu, J. H. Guo, S. D. Li, R. Liu, M. J. McDonald, and Y. Yang. "Polyanion Compounds as Cathode Materials for Li-Ion Batteries." In Rechargeable Batteries, 93–134. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15458-9_4.

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Hu, Bingwen, Zigeng Liu, and Rüdiger-A. Eichel. "CHAPTER 6. NMR Studies on Polyanion-type Cathode Materials for LIBs/NIBs." In New Developments in NMR, 211–52. Cambridge: Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839160097-00211.

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Terny, S., and M. A. Frechero. "Study of Phosphate Polyanion Electrodes and Their Performance with Glassy Electrolytes: Potential Application in Lithium Ion Solid-state Batteries." In Advanced Electrode Materials, 321–54. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119242659.ch8.

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Singh, Shashwat, Sai Pranav Vanam, Shubham Lochab, Maximilian Fichtner, and Prabeer Barpanda. "Development of polyanionic sodium-ion battery insertion materials." In Reference Module in Chemistry, Molecular Sciences and Chemical Engineering. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-823144-9.00154-0.

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Begam, K. M., M. S. Michael, and S. R. S. Prabaharan. "TOPOTACTIC LITHIUM INSERTION/EXTRACTION PROPERTIES OF A NEW POLYANION MATERIAL2(4)3[0 ≤ < 3] FOR RECHARGEABLE LITHIUM BATTERIES." In Solid State Ionics, 461–68. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702586_0049.

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Conference papers on the topic "Polyanionic materials"

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ALOUI, Thamer, Najla FOURATI, Hajer GUERMAZI, Samir GUERMAZI, and Chouki ZERROUKI. "Polyanionic Molybdate Powders as Promising Electrode Materials Based on NASICON Fe2 (MoO4)3 Networks." In MOL2NET 2018, International Conference on Multidisciplinary Sciences, 4th edition. Basel, Switzerland: MDPI, 2018. http://dx.doi.org/10.3390/mol2net-04-05642.

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Loyola, Bryan R., Valeria La Saponara, and Kenneth J. Loh. "Embedded Piezoresistive Thin Films for Monitoring GFRP Composites." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3621.

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The trend towards higher reliance on fiber-reinforced composites for structural components has led to the need to rethink current nondestructive evaluation (NDE) strategies. In principle, embeddable sensor schemes are desired for green-light/red-light structural health monitoring systems that do not negatively affect the properties and performance of the host structure. However, there are still numerous challenges that need to be overcome before these embedded sensing technologies can be realized for real-world structural systems. For example, some of these issues and challenges include the damage detection sensitivity/threshold, reliability of the system, transportability of the system to multiple configurations and different types of structural components, and signal processing/interpretation. The objective of this study is to develop a novel, embedded sensing system that can accurately quantify damage to composites without interfering with structural performance and functionality. In particular, this study will utilize multi-walled carbon nanotube (MWNT)-polyelectrolyte (PE) thin films deposited on a glass fiber substrate for in situ composite structural monitoring. A layer-by-layer (LbL) film fabrication methodology is employed for depositing piezoresistive nanocomposites directly onto glass fiber fabrics, and the resulting film exhibits excellent strain sensing performance, homogeneity, and exhibits no phase segregation. Specifically, the LbL fabrication process will employ polycationic poly(vinyl alcohol) (PVA) and polyanionic poly(sodium 4-styrene sulfonate) (PSS) doped with MWNTs for fabricating the electrically-conductive and piezoresistive thin films. Upon film deposition, the glass fiber substrates are infused with an epoxy matrix via wet-layup to fabricate self-sensing glass fiber-reinforced polymer (GFRP) composite specimens for testing. A frequency-domain approach, based on electrical impedance spectroscopy, is used to characterize the electromechanical response of the GFRP-MWNT-based thin film samples when subjected to complex uni-axial tensile load patterns. A resistor connected to a parallel resistor-capacitor circuit model is proposed for fitting experimental impedance spectroscopic measurements. It has been found that the series resistor models the bulk thin film piezoresistive performance accurately. In addition, these impedance measurements shed light on the glass fiber-thin film interaction electromechanical behavior. Bi-functional strain sensitivity is observed for all GFRP specimens, and the transition point of bilinear strain sensitivity is utilized as a possible metric for GFRP damage detection.
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Wang, Zhaomin, Fanming Zeng, Chun Li, and Limin Wang. "Polyanions SnWO4 nanowires using as the lithium-ion battery anode." In 2022 International Conference on Optoelectronic Materials and Devices, edited by Qiang Huang. SPIE, 2023. http://dx.doi.org/10.1117/12.2674018.

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Ke, Linping, Josselyne Chano, Melissa Weston, Hong Sun, and Dong Shen. "Dry Cationic Friction Reducers: New Alternative for High TDS Slickwater." In SPE International Conference on Oilfield Chemistry. SPE, 2021. http://dx.doi.org/10.2118/204286-ms.

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Abstract Currently, well stimulation in North America has evolved almost entirely to slickwater fracturing with friction reducers (FRs). Some parts of North America are notorious for their poor water quality, so wells are commonly treated using high total dissolved solids (TDS)-containing flow-back or produced water. Cationic FRs are usually applied in these systems due to their tolerance to multivalent cations in such waters. Additionally, dry friction reducers have gained momentum for better economics and logistics. In this paper, a dry cationic FR is systematically studied with respect to its "on the fly" hydration capability, friction reduction, mechanical stability, compatibility with other anionic chemical additives, and thermal stability in different levels of TDS brines. The cationic FR solution was subjected to varying shearing rates to understand its hydration capability, friction reduction, and mechanical stability. Its compatibility with anionic additives, such as a scale inhibitor, was also tested in a laboratory friction loop. Thermal stability of the cationic FR solution was studied at 150°F using a viscometer and Multi-Angle Laser Light Scattering (MALLS) method to obtain molecular weight information. The charge characteristics of the cationic FR, indicative of self-degradation properties, with exposure to heat, were also studied. Potential formation damage of the FR solution was evaluated with core flow tests in the absence of oxidizing breakers. Friction reduction and hydration tests show that the FR performs well in high TDS waters, even at low temperature, reaching its peak performance rapidly. The cationic FR possesses high mechanical stability even after being exposed to high pumping rates in the friction loop. It is well known that cationic FRs are not compatible with polyanionic scale inhibitors; in this study, a compatible scale inhibitor, SI-1, is identified. Additionally, there has historically been hesitation to use such cationic materials due to concerns of formation compatibility with negatively charged source rocks or flocculation in water treatment plants. Thermal testing with cationic FRs reveals that the material degrades to anionic without the aid of any other additive, which is confirmed by the fact that addition of polycationic additive, C1, caused coacervation in the heat-treated sample. As a result, concerns over effects of rock wettability or incompatibility with water treatment additives can be alleviated. No anionic FRs undergo similar change of the ionic charge. Thermal testing with cationic FR solutions also shows a significant viscosity drop, surprisingly without pronounced molecular weight loss (via MALLS). However, core flow testing of cationic FR fluids shows good regained permeability, even without breakers, further confirming self-cleaning capability. The degradation mechanism of these FRs will be shown. The self-cleaning capability of the dry cationic FR, even at relatively low bottomhole temperature (BHT), in combination with its high salt-tolerance, makes it an excellent friction reducer for multiple applications, especially with low quality water.
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Vujković, Milica, Aleksandra Gezović, Danica Bajuk Bogdanović, Tamara Petrović, Veselinka Grudić, and Slavko Mentus. "What Drives the Synthesis of Mixed Polyanionic Na4Fe3(PO4)2P2O7 Cathode Material and Determines its Electrochemical Behavior?" In MATSUS23 & Sustainable Technology Forum València (STECH23). València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.matsus.2023.112.

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Canepa, Pieremanuele, Zeyu Deng, Tara Mishra, Eunike Mahayoni, Vincent Seznec, Jean-Noel Chotard, Anthony Cheetham, Christian Masquelier, and Gopalakrishnan Sai Gautam. "Theoretical and Experimental Studies of ion Transport in Mixed Polyanion Solid Electrolytes." In Materials for Sustainable Development Conference (MAT-SUS). València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.nfm.2022.001.

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