期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 124, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2021.106951
关键词
Lithium ion battery; Lithium manganese oxides; Polypyrrole; Aluminum oxide; Battery performance
资金
- Natural Science Foundation of Tianjin Municipality [18JCYBJC21200]
Coating LiMn2O4 with Al2O3 and PPy using a sol-gel method improves electron conductivity, ion migration rate, and reduces Mn ion dissolution, resulting in enhanced Li ion storage performance of PPy/Al2O3/LMO. This strategy could be applied to synthesize other cathode materials for lithium ion batteries.
LiMn2O4 (LMO) is a promising cathode material for the assembly of lithium ion batteries in that it satisfies the requirement for a high specific capacity, but it lacks structural stability during long-term cycling. To overcome this challenge, Al2O3 and PPy are coated onto LiMn2O4 (PPy/Al2O3/LMO) using a sol-gel method followed by oxidative chemical polymerization. The discharge capacity of PPy/Al2O3/LMO reaches 121.73 mAh g(-1) at a rate of 1C. The retention is as high as 95.81% even after 100 charge/discharge cycles. The enhanced performance of PPy/Al2O3/LMO for Li ion storage results from improved electron conductivity, a more rapid ion migration rate, and reduced Mn ion dissolution. This strategy could be further utilized for the synthesis of other cathode materials for use in lithium ion batteries.
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