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Articles de revues sur le sujet « LNMO films »

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Auteur : Grafiati

Publié le 6 septembre 2023

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1

Wang, Yan, Guang Yang, Qian Peng et Pei Xiang Lu. « Excellent Electrochemical Performance and Thermal Stability of LiNi_0.5Mn_1.5O₄ Thin-Film Cathode Prepared by Pulsed Laser Deposition ». Advanced Materials Research 853 (décembre 2013) : 83–89. http://dx.doi.org/10.4028/www.scientific.net/amr.853.83.

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Lithium secondary batteries using LiNi0.5Mn1.5O4 (LNMO) films as a cathode material were prepared by pulsed laser deposition on stainless steel substrates. X-ray diffraction and Field-emission Scanning Electron Microscope results show that the film deposited at 750°C exhibits good crystallinity with well-defined grains structure. Galvanostatic charge/discharge measurement results revealed that the reversible capacity maintains 116.8mAhg-1 after 100 cycles at 0.5C. It also exhibits excellent rate capability, as the rates increase to 5 and 10 C, about 95.4% and 92.3% of its initial capacity at 0.2C can be retained. In additional, thermal stability of the Al2O3 coated LNMO thin film cathodes were also explored. The high temperature cyclic performance of LNMO thin film electrode was significantly enhanced by the coating.

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Solchenbach, Sophie, Morten Wetjen, Daniel Pritzl, K. Uta Schwenke et Hubert A. Gasteiger. « Lithium Oxalate as Capacity and Cycle-Life Enhancer in LNMO/Graphite and LNMO/SiG Full Cells ». Journal of The Electrochemical Society 165, n^o 3 (2018) : A512—A524. http://dx.doi.org/10.1149/2.0611803jes.

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Palakkal, Jasnamol P., Thorsten Schneider et Lambert Alff. « Oxygen defect engineered magnetism of La₂NiMnO₆ thin films ». AIP Advances 12, n^o 3 (1 mars 2022) : 035116. http://dx.doi.org/10.1063/9.0000360.

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The double perovskite La2NiMnO6 (LNMO) exhibits complex magnetism due to the competition of magnetic interactions that are strongly affected by structural and magnetic inhomogeneities. In this work, we study the effect of oxygen annealing on the structure and magnetism of epitaxial thin films grown by pulsed laser deposition. The key observations are that a longer annealing time leads to a reduction of saturation magnetization and an enhancement in the ferromagnetic transition temperature. We explain these results based upon epitaxial strain and oxygen defect engineering. The oxygen enrichment by annealing caused a decrease in the volume of the perovskite lattice. This increased the epitaxial strain of the films that are in-plane locked to the SrTiO3 substrate. The enhanced strain caused a reduction in the saturation magnetization due to randomly distributed anti-site defects. The reduced oxygen defects concentration in the films due to the annealing in oxygen improved the ferromagnetic long-range interaction and caused an increase in the magnetic transition temperature.

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Niketic, Svetlana, Gina Filoso, Mohamed Houache, Zouina Karkar, Chae-Ho Yim et Yaser Abu-Lebdeh. « 5V Solid-State Lithium Batteries Using Garnet-Based Electrolytes and LiNi_0.5Mn_1.5O₄ Spinel Cathode Composite ». ECS Meeting Abstracts MA2022-01, n^o 2 (7 juillet 2022) : 303. http://dx.doi.org/10.1149/ma2022-012303mtgabs.

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There is an ever increasing demand to increase the gravimetric and volumetric energy density of Lithium batteries as well as enhancing their safety cycle life and lower safety. Solid-State batteries (SSB) enjoy a great attention nowadays due to their potential to meet all those requirements and power the EV revolution. The use of solid electrolytes (SE) in commercial batteries has been solely limited to polymer electrolytes based on poly(ethylene oxide), PEO, coupled with LiFePO4 (LFP) that are limited by the oxidative stability of PEO to < 3.6 V and the low potential of LFP at 3.4 V. The commercial cells are cycled at high temperature (45 ⁰C) to overcome the modest ambient ionic conductivity of the SE and under a stack pressure and a cathode composite to overcome the high interfacial resistances of the solid-solid interfaces. A cathode composite is made of conventional cathode components with a "catholyte" added to the formulation. The catholyte is made of an optimized amount of an ionic conductor that is mostly derived from the solid electrolyte formulation. Very recent studies by our research group (1) and others (2) have shown that higher voltage cells can be made by using garnet or perovskite-based ceramic/polymer composites and LiNi0.5Mn0.3Co0.2O2 (NMC532) or LiNi0.6Mn0.2Co0.2O2 (NMC 622) layered cathodes reaching 4.2 V and can operate for few cycles. Herein, we extend the work in order to further increase the voltage of the SSB cells by using LiNi0.5Mn1.5O4 (LNMO) spinel cathode with its high potential of 4.7 V. The Tantalum-doped Lithium Lanthanum Zirconate, Li6.4La3Zr1.4Ta0.6O12 (Ta-doped LLZO, LLZTO), of the garnet family of solid electrolytes has been selected as a SE due to their high ambient ionic conductivity, wide electrochemical stability window and good chemical stability against Li metal. PEO and other compatible polymers have been used to formulate composite SEs in thin films and their properties were studied and compared with LLZTO pellets. Cells have been made using composite cathode formulations composed of LNMO cathode as an active material, carbon black, conventional and novel binders and a SE-based and proprietary catholyte coupled with the SE films or pellets and thick/thin Li films. The short-term cycling performance of the cells assembled with selected SEs and composite cathodes along with other electrochemical results will be presented. References: (1) Hilal Al-Salih, Allan Huang, Chae-Ho Yim, Annica I. Freytag, Gillian R. Goward, Elena Baranova and Yaser Abu-Lebdeh, 2020, J. Electrochem. Soc. 167 070557. (2) P. López-Aranguren, X. Judez, M. Chakir, M. Armand and L. Buannic, 2020, J. Electrochem. Soc. 167 020548.

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Koshtyal, Yury, Denis Olkhovskii, Aleksander Rumyantsev et Maxim Maximov. « Applications and Advantages of Atomic Layer Deposition for Lithium-Ion Batteries Cathodes : Review ». Batteries 8, n^o 10 (15 octobre 2022) : 184. http://dx.doi.org/10.3390/batteries8100184.

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Nowadays, lithium-ion batteries (LIBs) are one of the most convenient, reliable, and promising power sources for portable electronics, power tools, hybrid and electric vehicles. The characteristics of the positive electrode (cathode active material, CAM) significantly contribute to the battery’s functional properties. Applying various functional coatings is one of the productive ways to improve the work characteristics of lithium-ion batteries. Nowadays, there are many methods for depositing thin films on a material’s surface; among them, one of the most promising is atomic layer deposition (ALD). ALD allows for the formation of thin and uniform coatings on surfaces with complex geometric forms, including porous structures. This review is devoted to applying the ALD method in obtaining thin functional coatings for cathode materials and includes an overview of more than 100 publications. The most thoroughly investigated surface modifications are lithium cobalt oxide (LCO), lithium manganese spinel (LMO), lithium nickel-cobalt-manganese oxides (NCM), lithium-nickel-manganese spinel (LNMO), and lithium-manganese rich (LMR) cathode materials. The most studied processes of deposition are aluminum oxide (Al2O3), titanium dioxide (TiO2) and zirconium dioxide (ZrO2) films. The primary purposes of such studies are to find the synthesis parameters of films, to find the optimal coating thickness (e.g., ~1–2 nm for Al2O3, ~1 nm for ZrO2, <1 nm for TiO2, etc.), and to reveal the effect of the coating on the electrochemical parameters of batteries. The review summarizes synthesis conditions, investigation results of deposited films on CAMs and positive electrodes and some functional effects observed due to films obtained by ALD on cathodes.

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Milien, Mickdy S., Hans Beyer, Witali Beichel, Petra Klose, Hubert A. Gasteiger, Brett L. Lucht et Ingo Krossing. « Lithium Bis(2,2,2-trifluoroethyl)phosphate Li[O2P(OCH2CF3)2] : A High Voltage Additive for LNMO/Graphite Cells ». Journal of The Electrochemical Society 165, n^o 11 (2018) : A2569—A2576. http://dx.doi.org/10.1149/2.0541811jes.

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Pritzl, Daniel, Johannes Landesfeind, Sophie Solchenbach et Hubert A. Gasteiger. « An Analysis Protocol for Three-Electrode Li-Ion Battery Impedance Spectra : Part II. Analysis of a Graphite Anode Cycled vs. LNMO ». Journal of The Electrochemical Society 165, n^o 10 (2018) : A2145—A2153. http://dx.doi.org/10.1149/2.0461810jes.

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Kalinina, Elena, Alexander Kolchugin, Kirill Shubin, Andrei Farlenkov et Elena Pikalova. « Features of Electrophoretic Deposition of a Ba-Containing Thin-Film Proton-Conducting Electrolyte on a Porous Cathode Substrate ». Applied Sciences 10, n^o 18 (18 septembre 2020) : 6535. http://dx.doi.org/10.3390/app10186535.

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This paper presents the study of electrophoretic deposition (EPD) of a proton-conducting electrolyte of BaCe0.89Gd0.1Cu0.01O3-δ (BCGCuO) on porous cathode substrates of LaNi0.6Fe0.4O3−δ (LNFO) and La1.7Ba0.3NiO4+δ (LBNO). EPD kinetics was studied in the process of deposition of both a LBNO sublayer on the porous LNFO substrate and a BCGCuO electrolyte layer. Addition of iodine was shown to significantly increase the deposited film weight and decrease the number of EPD cycles. During the deposition on the LNFO cathode, Ba preservation in the electrolyte layer after sintering at 1450 °C was achieved only with a film thickness greater than 20 μm. The presence of a thin LBNO sublayer (10 μm) did not have a pronounced effect on the preservation of Ba in the electrolyte layer. When using the bulk LBNO cathode substrate as a Ba source, Ba was retained in a nominal amount in the BCGCuO film with a thickness of 10 μm. The film obtained on the bulk LBNO substrate, being in composition close to the nominal composition of the BCGCuO electrolyte, possessed the highest electrical conductivity among the films deposited on the various cathode substrates. The technology developed is a base step in the adaptation of the EPD method for fabrication of cathode-supported Solid Oxide Fuel Cells (SOFCs) with dense barium-containing electrolyte films while maintaining their nominal composition and functional characteristics.

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Атанова, А. В., О. М. Жигалина, Д. Н. Хмеленин, Д. С. Серегин et К. А. Воротилов. « Кристаллизация слоев в гетероструктурах PZT/LNO/Si ». Физика твердого тела 61, n^o 12 (2019) : 2442. http://dx.doi.org/10.21883/ftt.2019.12.48575.03ks.

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The microstructure of the layers of the Pb(Zr0.52Ti0.48)O3–LaNiO3–Si composition and LaNiO3 thin films obtained by chemical solution deposition was studied using transmission electron microscopy. It was revealed that the polycrystalline, porous structure of LaNiO3 leads to a breakdown of the columnar structure of the lead zirconate titanate. The effect of heat treatment on the structure and phase composition of lanthanum nickelate is considered. It is shown that such morphological features of the structure of the LaNiO3 film, such as foliation, porosity and disorientation, are observed during annealing at T = 550 ° C and aggravated when the temperature rises to T = 800 ° C. The sample structure study was financially supported by the Ministry of Science and Higher Education within the State assignment FSRC “Crystallography and Photonics” RAS. This work was performed using the equipment of the Shared Research Center FSRC “Crystallography and Photonics” RAS and was supported by the Russian Ministry of Education and Science. Heterostructures were synthesized in Federal State Budgetary Institution of Higher Education "MIREA - Russian Technological University" with partial support from the RFBR grant 19-29-03058.

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Xu, Xiao-Yu, et Bing Yan. « Nanoscale LnMOF-functionalized nonwoven fibers protected by a polydimethylsiloxane coating layer as a highly sensitive ratiometric oxygen sensor ». Journal of Materials Chemistry C 4, n^o 36 (2016) : 8514–21. http://dx.doi.org/10.1039/c6tc02569b.

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Li, Tao, Genshui Wang, Kui Li, Nossikpendou Sama, Denis Remiens et Xianlin Dong. « Influence of LNO Top Electrodes on Electrical Properties of KNN/LNO Thin Films Prepared by RF Magnetron Sputtering ». Journal of the American Ceramic Society 96, n^o 3 (26 octobre 2012) : 787–90. http://dx.doi.org/10.1111/jace.12047.

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Wang, Hao, Jian Zhai, Wenhui Lu, Jianguo Chen et Jinrong Cheng. « Ferroelectric and dielectric properties of BF-PT/LNO thin films on different substrates ». Journal of Materials Science : Materials in Electronics 32, n^o 3 (11 janvier 2021) : 3334–40. http://dx.doi.org/10.1007/s10854-020-05081-0.

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Kobayashi, Takeshi, Masaaki Ichiki, Toshihiko Noguchi et Ryutaro Maeda. « Deflection of wafers and cantilevers with Pt/LNO/PZT/LNO/Pt/Ti/SiO2 multilayered structure ». Thin Solid Films 516, n^o 16 (juin 2008) : 5272–76. http://dx.doi.org/10.1016/j.tsf.2007.07.067.

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Zhao, Xuelian, Dan Jiang, Shengwen Yu et Jinrong Cheng. « Structure and electrical properties of PZT/LNO/PT multilayer films on stainless steel substrates ». Rare Metals 31, n^o 3 (juin 2012) : 272–75. http://dx.doi.org/10.1007/s12598-012-0504-9.

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15

Aras, Fikret G., E. Oz Orhan et I. Karaçali. « Benzocyclobutene (BCB 4022-35) Polymer Thin Films by Spin Coating Method ». Lecture Notes on Photonics and Optoelectronics 1, n^o 1 (2013) : 9–13. http://dx.doi.org/10.12720/lnpo.1.1.9-13.

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Detalle, M., T. T. Nguyen, G. S. Wang et D. Remiens. « INTERFACIAL EFFECTS ON THE CRYSTALLIZATION TEMPERATURE OF PMN-PT FILMS DEPOSITED ON LNO OR Pt BOTTOM ELECTRODES ». Integrated Ferroelectrics 98, n^o 1 (13 juin 2008) : 171–82. http://dx.doi.org/10.1080/10584580802093520.

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Wang, Susu, Hao Wang, Jie Jian, Jianguo Chen et Jinrong Cheng. « Effects of LNO buffer layers on electrical properties of BFO-PT thin films on stainless steel substrates ». Journal of Alloys and Compounds 784 (mai 2019) : 231–36. http://dx.doi.org/10.1016/j.jallcom.2019.01.033.

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Zhou, Q. F., K. K. Shung, Q. Q. Zhang et F. T. Djuth. « Temperature dependence of oriented growth of Pb[Yb1/2Nb1/2]O3–PbTiO3 thin films deposited on LNO/Si substrates ». Thin Solid Films 517, n^o 2 (novembre 2008) : 695–98. http://dx.doi.org/10.1016/j.tsf.2008.08.004.

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Sama, Nossikpendou, Romain Herdier, David Jenkins, Caroline Soyer, Denis Remiens, Mickaël Detalle et Rachid Bouregba. « On the influence of the top and bottom electrodes—A comparative study between Pt and LNO electrodes for PZT thin films ». Journal of Crystal Growth 310, n^o 14 (juillet 2008) : 3299–302. http://dx.doi.org/10.1016/j.jcrysgro.2008.04.025.

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Kaleli, B., M. D. Nguyen, J. Schmitz, R. A. M. Wolters et R. J. E. Hueting. « Analysis of thin-film PZT/LNO stacks on an encapsulated TiN electrode ». Microelectronic Engineering 119 (mai 2014) : 16–19. http://dx.doi.org/10.1016/j.mee.2014.02.012.

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Chen, Xiaoyang, Yi Zhang, Bin Xie, Wenwu Wang, MingJian Ding et Ping Yu. « Greatly enhanced breakdown strength of Pt/LNO/BST/Au thin films by regulating the space charge limited current though the dielectrics/electrode interface modification ». Journal of Alloys and Compounds 831 (août 2020) : 154883. http://dx.doi.org/10.1016/j.jallcom.2020.154883.

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Ishikawa, Kenji, Satoshi Kinoshita, Yuichi Suzuki, Shigenori Matsuura, Takao Nakanishi, Makoto Aizawa et Yasuo Suzuki. « Preparation and Electrical Properties of ( LaO ) AgS and ( LnO ) CuS ( Ln = La , Pr , or Nd ) ». Journal of The Electrochemical Society 138, n^o 4 (1 avril 1991) : 1166–70. http://dx.doi.org/10.1149/1.2085735.

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Póvoa, Antónia Afonso, Elisabete Teixeira, Maria Rosa Bella-Cueto, Miguel Melo, Maria João Oliveira, Manuel Sobrinho-Simões, Jorge Maciel et Paula Soares. « Clinicopathological Features as Prognostic Predictors of Poor Outcome in Papillary Thyroid Carcinoma ». Cancers 12, n^o 11 (29 octobre 2020) : 3186. http://dx.doi.org/10.3390/cancers12113186.

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Papillary thyroid cancer (PTC) has an indolent nature and usually excellent prognosis. Some PTC clinicopathological features may contribute to the development of aggressive metastatic disease. In this work, we want to evaluate PTC clinicopathological features that are presurgical prognostic predictors of patients’ outcomes and find which indicators are more adequate for tailoring surgical procedures and follow-up. We studied a series of 241 PTC patients submitted to surgery. All patients’ files and histological tumor samples were reviewed. The 8th edition AJCC/UICC (American Joint Committee on Cancer/Union for International Cancer) Controlstaging system and the 2015 American Thyroid Association risk stratification system were used. Total thyroidectomy was performed in 228 patients, lymphadenectomy in 28 patients. Gross extrathyroidal extension (ETE) was present in 10 patients and 31 tumor resection margins were incomplete. Cervical lymph node metastases (LNMs) were present in 34 patients and distant metastases at diagnosis in four patients. In multivariate analysis, male gender (OR = 15.4, p = 0.015), venous invasion (OR = 16.7, p = 0.022), and lateral compartment LNM (OR = 26.7, p = 0.004) were predictors of mortality; psammoma bodies (PBs) (OR = 4.5, p = 0.008), lymph vessel invasion (OR = 6.9, p < 0.001), and gross ETE (OR = 16.1, p = 0.001) were predictors of structural disease status; male gender (OR = 2.9, p = 0.011), lymph vessel invasion (OR = 2.8, p = 0.006), and incomplete resection margins (OR = 4.6, p < 0.001) were predictors of recurrent/persistent disease. Our study supports that the factors helping to tailor patient’s surgery are male gender, presence of PBs, gross ETE, and lateral compartment LNM. Together with pathological factors, lymph vessel invasion, venous invasion, necrosis, and incomplete surgical resection, should be taken into consideration regarding treatment and follow-up of patients.

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ZHANG, X. D., T. LIN, X. J. MENG, J. L. SUN, J. H. CHU, SUNGMIN PARK, HYOSANG KWON, JIHWAN HWANG et GWANGSEO PARK. « STRUCTURES AND PROPERTIES OF PZT(52/48) THIN FILMS WITH DIFFERENT SUBSTRATE TEMPERATURE AND OXYGEN PERCENTAGE IN MIXED Ar AND O2 GAS ON LNO/Si (100) BY SPUTTERING ». Integrated Ferroelectrics 113, n^o 1 (15 juin 2010) : 63–71. http://dx.doi.org/10.1080/10584587.2009.490195.

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Wei, Yongqin, Qiaohong Li, Rongjian Sa et Kechen Wu. « A white-light-emitting LnMOF with color properties improved via Eu3+ doping : an alternative approach to a rational design for solid-state lighting ». Chemical Communications 50, n^o 15 (2014) : 1820. http://dx.doi.org/10.1039/c3cc48344d.

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Yu, Chongchen, haitao zhou, Jian-Chun Wu, Jiacheng Han, Haiyun Zhou, Feng Ling, Dong Hou et Hongquan Gao. « Ion-Permselective Polyphenylene Sulfide-Based Solid-State Separator for High Voltage LiNi0.5Mn1.5O4 Battery ». Journal of The Electrochemical Society, 19 juillet 2022. http://dx.doi.org/10.1149/1945-7111/ac8244.

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Abstract The decomposition of commonly used commercial electrolytes under high voltage and the continuous side reactions at the graphite anode cause rapid capacity decay of LiNi0.5Mn1.5O4(LNMO)/graphite full cell during cycling. In this work, we adopt ion-permselective polyphenylene sulfide-based solid state separator (PPS-SSS) for LNMO batteries, PPS-SSS can effectively prevent the proton diffusion, block the HF generated on the LNMO cathode from attacking the anode SEI layer, and mitigate the Mn2+ transfer. The PPS-SSS with anodic polyethylene (PE) protection (PE-PPS-CSSS) significantly improved the cycling performance of LNMO batteries. In the LNMO/Li half-cell system, 93% capacity retention rate can be achieved after 140 cycles at 0.5 C, and in the LNMO/graphite full-cell system, 85% of the initial capacity can be maintained after 100 cycles. Moreover, flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy are applied to explore the interfacial reactions of LNMO/graphite batteries and reveal the key mechanism for the stable cycling using PPS-SSS.

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Kubot, Maximilian, Martin Winter, Simon Wiemers-Meyer, Bastian von Holtum et Sascha Nowak. « Organofluorophosphates as Oxidative Degradation Products in High-Voltage Lithium Ion Batteries with NMC or LNMO Cathodes ». Journal of The Electrochemical Society, 15 novembre 2022. http://dx.doi.org/10.1149/1945-7111/aca2e8.

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Abstract Organofluorophosphates (OFPs) have been reported to pose substantial health hazards due to their structural similarities to pesticides and nerve agents. Formation of OFPs in lithium ion batteries (LIBs) due to hydrolysis of the conducting salt lithium hexafluorophosphate (LiPF6) and the reaction with the organic carbonate solvents has been discussed in the literature. The oxidative formation of OFPs in electrolytes containing fluoroethylene carbonate (FEC) and vinylene carbonate (VC) as film-forming additives is presented here. Furthermore, the impact of potentially reactive positive electrode surfaces is investigated with the layered metal oxide NCM622 which is ascribed to release reactive oxygen species at high voltages and the spinel type LNMO as a typical high-voltage material. Cycling of the self-assembled LIB coin cells (CR2032) at cut-off voltages of 4.8 V gave rise to a number of degradation products including potentially highly toxic OFPs. Here, the presence of the film-forming additive had a massive impact on the amount of OFPs formed during electrochemical cycling experiments, which raises further concerns for the utilization of film-forming additives for high voltage applications. The formation pathway of OFPs through EC-polymerization proposed in literature is evaluated and an alternative mechanism with FEC/ VC as the carbonyl carbon-donor is presented

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Yu, Zhiao, Weilai Yu, Yuelang Chen, Luca Mondonico, Xin Xiao, Yu Zheng, Fang Liu, Samantha T. Hung, Yi Cui et Zhenan Bao. « Tuning Fluorination of Linear Carbonate for Lithium-Ion Batteries ». Journal of The Electrochemical Society, 18 avril 2022. http://dx.doi.org/10.1149/1945-7111/ac67f5.

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Abstract Liquid electrolyte engineering plays a critical role in modern lithium-ion batteries. However, the existing electrolytes fall short when used with some trending battery chemistries such as high-voltage and high-energy-density electrodes. Fluorination of electrolyte solvents has been identified as an effective approach for improved cyclability, but few works systematically studied the effects of fluorination extent of carbonate solvents on battery performance. Here we design and synthesize a family of fluorinated ethyl methyl carbonates. Different numbers of F atoms are finely tuned to yield monofluoroethyl methyl carbonate (F1EMC), difluoroethyl methyl carbonate (F2EMC) and trifluoroethyl methyl carbonate (F3EMC). The cycling behavior of several types of lithium-ion pouch cells, including graphite (Gr)/single-crystalline LiNi0.8Mn0.1Co0.1O2 (SC-NMC811), Gr-SiOx/LiNi0.6Mn0.2Co0.2O2 (NMC622), high-voltage Gr/LiNi0.5Mn1.5O4 (LNMO), Gr/layered Li-rich Mn-based oxide (LLMO) and fast-charging Gr/NMC622, were systematically investigated to understand the impact of fluorination degree. Compared to the commercially available F3EMC, we found that the partially-fluorinated F1EMC and F2EMC in some cases showed improved cycling stability, which we attribute to their locally-polar –CH2F and –CHF2 groups and thus fast ion conduction than –CF3. This work suggests that highly or fully fluorinated solvents are not necessarily desirable; instead, fluorination degree needs to be rationally and finely tuned for optimized lithium-ion cell performance.

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Qin, Yongfu, Yuan Gao, Fengzhen Lv, Fangfang Huang, Fuchi Liu, Tingting Zhong, Yuhang Cui et Xuedong Tian. « Multilevel resistive switching memory in lead-free double perovskite La$$_{2}$$NiFeO$$_{6}$$ films ». Discover Nano 18, n^o 1 (29 août 2023). http://dx.doi.org/10.1186/s11671-023-03885-7.

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AbstractDense and flat La$$_{2}$$ 2 NiFeO$$_{6}$$ 6 (LNFO) films were fabricated on the indium tin oxide-coated glass (ITO/glass) substrate by sol–gel method. The bipolar resistive switching behavior (BRS) could be maintained in 100 cycles and remained after 30 days, indicating that the LNFO-based RS device owned good memory stability. Surprisingly, the multilevel RS characteristics were firstly observed in the Au/LNFO/ITO/glass device. The high resistance states (HRSs) and low resistance state (LRS) with the maximum ratio of $$\sim$$ ∼ 500 could be remained stably in 900 s and 130 cycles, demonstrating the fine retention and endurance ability of this LNFO-based RS device. The BRS behavior of Au/LNFO/ITO/glass devices primarily obeyed the SCLC mechanism controlled by oxygen vacancies (OVs) dispersed in the LNFO layer. Under the external electric field, injected electrons were captured or discharged by OVs during trapping or detrapping process in the LNFO layer. Thus, the resistive state switched between HRS and LRS reversibly. Moreover, the modulation of Schottky-like barrier formed at the Au/LNFO interface was contributed to the resistive states switchover. It was related to the change in OVs located at the dissipative region near the Au/LNFO interface. The multilevel RS ability of LNFO-based devices in this work provides an opportunity for researching deeply on the high density RS memory in lead-free double perovskite oxides-based devices.

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yang, tingting, Chi-Te Chin, Yingtuo Li et Ching-Hsiang Cheng. « Sustainable Low-Temperature Coating of LATP/C Solid Electrolyte Composites on LiNi1/3Co1/3Mn1/3O2 Cathode Based on Lithium Iodide Solvent-Recrystallization for Li-Ion Batteries ». Journal of The Electrochemical Society, 21 novembre 2022. http://dx.doi.org/10.1149/1945-7111/aca4a4.

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Abstract A mixed ionic (Li1.3Al0.3Ti1.7(PO4)3: LATP) and electronic conductor (porous carbon: C) hybrid layer can effectively enhance the electrochemical performance of cathode materials. In this work, a sustainable low-temperature synthesis strategy (≤ 200℃) combining ball milling and solvent-recrystallization of lithium iodide is proposed to prepare the LATP/C coated LiNi1/3Co1/3Mn1/3O2 (LNCMO) material. The characterizations of structures and morphology reveal that LATP and porous carbon powder are mixed into the ethanol dissolved lithium iodide by a simple ball milling process, then the lithium iodide is recrystallized to serve as a binder when ethanol is vaporized at a low temperature to coat uniform thickness and homogeneously distributed LATP/C on the surface of LNCMO cathode. The charge-discharge results illustrate that the cycling performance and rate discharge capability of the active materials coated with LATP/C are significantly superior to the bare LNCMO. AC impedance analysis confirms that lower charge transfer resistance and higher Li+ ion diffusion coefficient are achieved in cathode materials. This work successfully exploited a novel low-temperature cathode coating method based on lithium iodide solvent-recrystallization and obtained results comparable to high-temperature processes without suffering from side reaction problems.

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Ke, Bingyu, Shiyong Chu, Jing-Chang Li, Xiang-Qun Xu, Huan Yao, Shaohua Guo et Haoshen Zhou. « A new Li-rich layered cathode with low lattice-strain for Lithium-ion batteries ». Chemical Communications, 2022. http://dx.doi.org/10.1039/d2cc04044a.

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Thankachen, Nisha, U. V. Chhaya, A. Tripathi et Utpal Joshi. « Magnetic field control and swift heavy ion beam assisted tuning of resistive switching properties of BSFO/CFO/LNO heterostructures ». Physica Scripta, 10 février 2023. http://dx.doi.org/10.1088/1402-4896/acbb3e.

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Abstract Resistive switching (RS) behavior in mixed oxide insulators has shown a great promise as memristors or non-volatile resistive random-access memory (RRAM) applications. For dilute magnetic oxide multilayers, a novel approach of controlled defects induced and the magnetic field control of RS behavior is proposed. Resistive switching in Bi0.6Sr0.4FeO3 /CoFe2O4 /LaNiO3 (BSFO /CFO /LNO) multilayer heterostructures has been investigated as a case study. All oxide junctions consisting of conducting LaNiO3 (LNO) bottom electrode and BSFO-CFO active layers were fabricated by using chemical solution deposition. A set of samples were irradiated with 150 MeV Ag11+ ions for three different ion fluence of ~ 1×10+11 ions/cm2, 1×10+12 ions/cm2 and 5×10+12 ions/cm2. Polycrystalline phase pure films with smooth, crack free surfaces were observed for pristine and irradiated samples. Optical spectroscopy revealed a decrease in the transmittance upon increasing ion fluence due to increase in the light scattering centres. The optical band gap showed a systematic decrease from 2.09 eV to 1.65 eV with increasing ion fluence. Room temperature I-V characteristics showed consistent and pronounced bipolar switching for all samples below ± 5 V. Upon applied magnetic fields of 0.58 T, the resistive switching ratios were found to increase significantly and were further tuned by 150 MeV Ag11+ ion beam irradiations. The magnetic field control of electrical transport properties in the controlled defect assisted oxide heterojunctions offers new insights to the existing understanding of oxide-based RS mechanism.

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Li, Zhen, Jianshe Yue, Nusrat Rafsani Eka et Qi Zhang. « Fabrication of Pt/InGaZnO/PZT/LNO hetero-structure by one-step photochemical method ». Materials Research Express, 29 juillet 2022. http://dx.doi.org/10.1088/2053-1591/ac859d.

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Abstract The transparent InGaZnO (IGZO) film was fabricated on the surface of PZT film by photochemical sol-gel method, hence more UV light can penetrate IGZO film reaching the IGZO/PZT junction and produce photo-induced charge carrier to obtain a high photocurrent. To decrease the crystalline temperature of PZT film, and simplify the fabrication process, the UV photochemical treatment of IGZO and PZT happened at the same time. During photochemical process, the organic agents of both IGZO and PZT gel film were decomposed greatly, forming an active metal-oxygen bond, which facilitate crystallization at a low temperature. The obtained IGZO film show a uniform surface with homogeneous particles, the obtained Pt/IGZO/PZT/LNO hetero-structure shows a good photoelectric property.

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Dalkilic, Mert, Alexander Schmidt, Thomas D. Schladt, Peter Axmann, Margret Wohlfahrt-Mehrens et Mika Linden. « W-Doping of Dense NMC811 Hydroxide through Wet-Impregnation and Its Impact on Crystal Structure, Phase Transition Related Gas Evolution and Electrochemical Performance at Elevated Upper Cut-Off Voltage ». Journal of The Electrochemical Society, 16 novembre 2022. http://dx.doi.org/10.1149/1945-7111/aca360.

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Abstract Doping of Ni-rich LNMC cathode materials with tungsten via a solid-state route has been shown to stabilize the materials against structural degradation at high voltages during electrochemical cycling. Here we use a wet-chemical doping method to homogeneously introduce 0.5 mol% tungsten into dense NMC811 (Li[(Ni0.8Mn0.1Co0.1)]O2), followed by a detailed structural and electrochemical characterization. A homogeneous distribution of W in the materials was evidenced by elemental mapping and TOF-SIMS. The increase in bond-dissociation energy to oxygen of the transition metal (TM) site led to compressed slab thickness (TMO6 octahedron width in c-direction), indicating shorter, and thus strengthened, TM-O bonds, as also confirmed by TGA-MS results. Importantly, statistical analysis of electron backscatter diffraction data revealed a W-induced radial alignment of a-b planes of the primary particles. The cycling stability of the doped material was more than 7% higher for the W-doped (92.4%) as compared to the undoped NMC811 (85.3%) material at a higher upper cut-off voltage of 4.5 V vs. Li/Li+. Furthermore, the voltage decay was lower (0.2 V vs. 0.29 V), leading to >2% lower energy loss (5.3% vs. 7.4%) for the W-doped material.

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