Li3VO4修饰富镍LiNi0.8Co0.1Mn0.1O2正极材料的电化学性能

doi:10.11949/j.issn.0438-1157.20180664

化工学报 ›› 2018, Vol. 69 ›› Issue (12): 5332-5338.DOI: 10.11949/j.issn.0438-1157.20180664

• 材料化学工程与纳米技术 • 上一篇下一篇

Li₃VO₄修饰富镍LiNi_0.8Co_0.1Mn_0.1O₂正极材料的电化学性能

宋刘斌, 唐福利, 肖忠良

长沙理工大学化学与生物工程学院, 湖南长沙 410114

收稿日期:2018-06-19 修回日期:2018-09-06 出版日期:2018-12-05 发布日期:2018-12-05
通讯作者: 肖忠良
基金资助:
国家自然科学基金项目（21501015，21545010，31527803）；中国科学院环境监测STS项目（KFJ-SW-STS-173）。

Electrochemical performance of Li₃VO₄ modified Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials

SONG Liubin, TANG Fuli, XIAO Zhongliang

School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China

Received:2018-06-19 Revised:2018-09-06 Online:2018-12-05 Published:2018-12-05
Supported by:
supported by the National Natural Science Foundation of China (21501015, 21545010, 31527803) and the STS Project of the Chinese Academy of Sciences (KFJ-SW-STS-173).

摘要/Abstract

摘要：

采用湿法融合技术及高温固相法合成Li₃VO₄包覆的LiNi_0.8Co_0.1Mn_0.1O₂正极材料。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）等方法研究材料的结晶相、形貌、微观结构。研究表明，Li₃VO₄均匀地包覆在LiNi_0.8Co_0.1Mn_0.1O₂表面，未改变原材料的材料结构和形貌，包覆层厚度为1～2 nm。不同含量的Li₃VO₄对LiNi_0.8Co_0.1Mn_0.1O₂正极材料进行修饰研究表明，3%（质量）Li₃VO₄包覆的LiNi_0.8Co_0.1Mn_0.1O₂在1 C下100次循环后容量保持率为94.13%，具有最佳的倍率性能和循环性能。此外，循环伏安（CV）和交流阻抗（EIS）分析表明，Li₃VO₄能提高Li⁺电导率，抑制活性材料与电解液之间的副反应，提高材料的电化学性能。

关键词: LiNi_0.8Co_0.1Mn_0.1O₂, 包覆, Li₃VO₄, 电化学, 稳定性, 表面

Abstract:

The Li₃VO₄ coated LiNi_0.8Co_0.1Mn_0.1O₂ cathode material was synthesized by wet fusion technology and high temperature solid phase method. The crystalline phase, morphology and microstructure of materials were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that Li₃VO₄ is evenly coated on the surface of LiNi_0.8Co_0.1Mn_0.1O₂ without changing the material structure and morphology of the raw materials. The coating thickness is 1-2 nm. The modification of LiNi_0.8Co_0.1Mn_0.1O₂ cathode material with different content of Li₃VO₄ shows that 3%(mass) Li₃VO₄ coated LiNi_0.8Co_0.1Mn_0.1O₂ has a capacity retention rate of 94.13% after 100 cycles under 1 C, which has the best multiplier performance and cycling performance. In addition, cyclic voltammetry (CV) and alternating current impedance (EIS) analysis show that Li₃VO₄ can increase Li⁺ conductivity, inhibit the side-effect between active material and electrolyte, and improve the electrochemical properties of materials.

Key words: LiNi_0.8Co_0.1Mn_0.1O₂, coated, Li₃VO₄, electrochemistry, stability, surface

中图分类号:

TM912.9

宋刘斌, 唐福利, 肖忠良. Li₃VO₄修饰富镍LiNi_0.8Co_0.1Mn_0.1O₂正极材料的电化学性能[J]. 化工学报, 2018, 69(12): 5332-5338.

SONG Liubin, TANG Fuli, XIAO Zhongliang. Electrochemical performance of Li₃VO₄ modified Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials[J]. CIESC Journal, 2018, 69(12): 5332-5338.

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Li₃VO₄修饰富镍LiNi_0.8Co_0.1Mn_0.1O₂正极材料的电化学性能

Electrochemical performance of Li₃VO₄ modified Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials

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