三(2,2,2-三氟乙基)亚磷酸酯作为高效电解质添加剂提高LiNi0.1Mg0.1Co0.8O₂和LiFePO₄阴极的电化学性能

S Arockia Shyamala Paniyarasi, S Padmaja, M Pushpa Selvi, R M Gnanamuthu, R Nimma Elizabeth
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引用次数: 0

摘要

本文研究了三氟(2,2,2-三氟乙基)亚磷酸酯(TTFP)作为高效添加剂在层状纳米结构LiNi0.1Mg0.1Co0.8O₂和橄榄石LiFePO₄正极材料在EC/DMC和1M LiPF6锂离子电池电解质中循环中的重要作用。循环伏安法、恒流充放电、电化学阻抗谱等电化学表征技术表明,TTFP提高了LiNi0.1Mg0.1Co0.8O₂和LiFePO₄电极的循环稳定性,降低了其不可逆容量。电解质溶液中TTFP的存在降低了室温下LiNi0.1Mg0.1Co0.8O₂和LiFePO₄正极材料的阻抗。在不同电势下,从LiNi0.1Mg0.1Co0.8O₂和LiFePO₄电极上得到了一系列的Nyquist图。电解质中TTFP的加入降低了锂化LiNi0.1Mg0.1Co0.8O₂和LiFePO₄的表面阻抗,这可归因于添加剂在电极表面的反应。此外,在LiNi0.1Mg0.1Co0.8O₂和LiFePO₄电池中添加TTFP,提高了锂的扩散速率,提高了正极材料的电子导电性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Elevated Electrochemical Performance of LiNi0.1Mg0.1Co0.8O₂ and LiFePO₄ Cathodes with Tris(2,2,2-trifluoroethyl) Phosphite as an Efficient Electrolyte Additive.

The significant role of Tris(2,2,2-trifluoroethyl) phosphite (TTFP) as an efficient additive during cycling of the layered nanostructured LiNi0.1Mg0.1Co0.8O₂ and olivine LiFePO₄ cathode materials in EC/DMC and 1M LiPF6 electrolyte for Li-ion battery are extensively investigated in this work. The electrochemical characterization techniques such as cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy show that TTFP improves cycling stability and reduces the irreversible capacity of LiNi0.1Mg0.1Co0.8O₂ and LiFePO₄ electrodes. Also, the presence of TTFP in electrolyte solution reduces the impedance in LiNi0.1Mg0.1Co0.8O₂ and LiFePO₄ cathode materials at room temperature. A family of Nyquist plots was obtained from LiNi0.1Mg0.1Co0.8O₂ and LiFePO₄ electrodes for various potentials during the course of charging. The addition of TTFP in the electrolyte reduces the surface impedance of lithiated LiNi0.1Mg0.1Co0.8O₂ and LiFePO₄ which can be attributed to the reaction of the additive on the electrode's surface. Also, the presence of the additive TTFP in LiNi0.1Mg0.1Co0.8O₂ and LiFePO₄ cell enhances the lithium diffusion rate and improves the electronic conductivity of the cathode material.

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来源期刊
Journal of nanoscience and nanotechnology
Journal of nanoscience and nanotechnology 工程技术-材料科学:综合
自引率
0.00%
发文量
0
审稿时长
3.6 months
期刊介绍: JNN is a multidisciplinary peer-reviewed journal covering fundamental and applied research in all disciplines of science, engineering and medicine. JNN publishes all aspects of nanoscale science and technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, theory and computation, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology.
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