期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 848, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156387
关键词
LiNi0.8Co0.1Mn0.1O2; PPy-LiAlO2 surface coating; Cycling performance; Rate capability; Lithium-ion batteries
资金
- China Postdoctoral Science Foundation [2019T120285, 2018M641884]
- Heilongjiang Province Postdoctoral Science Foundation [LBH-Z18235]
- Heilongjiang University Youth Science and Technology Innovation Team Project (gs3%20:) [2018-KYYWF-1593, RCCXYJ201805]
Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM) as a high capacity cathode material is the most promising candidate for lithium-ion batteries. However, NCM still suffers from poor rate capability and insufficient cycle stability owing to the poor conductivity as well as side reactions. Here, a dual-conductive coating strategy is employed to address these issues. The PPy-LiAlO2 coated NCM composites (PPy-LA) are synthesized by hydrolysis-hydrothermal approach and in-situ chemical polymerization method. The LiAlO2 coating can suppress side reactions and enhance ionic conductivity, and the PPy coating can increase electronic conductivity. As a result, the PPy-LA sample delivers superior cycling stability and rate capability compared to NCM sample. The capacity retention of PPy-LA is 92.8% after 100 loops and a high capacity of 128 mAh/g is obtained at 2 A/g. This effective surface modification method could shed light on other cathode materials. (C) 2020 Elsevier B.V. All rights reserved.
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