Polypyrrole/Al2O3/LiMn2O4 cathode for enhanced storage of Li ions

• Published in: Electrochemistry communications Vol. 124; p. 106951
• Main Authors: Zhu, Liang, Zhang, Yingbing, Zhao, Xiaoyu, Jiao, Yaoxin, Zhao, Zijian, Wang, Yanfei, Yang, Nianjun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2021; Elsevier
• Subjects: Aluminum oxide; Battery performance; Lithium ion battery; Lithium manganese oxides; Polypyrrole; Lithium ion battery; Battery performance; Lithium manganese oxides; Polypyrrole; Aluminum oxide
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2021.106951

[Display omitted] •LiMn2O4 is coated with Al2O3 and polypyrrole using a sol-gel method followed by oxidative chemical polymerization.•The 3-D framework of this coating provides an increased surface area and rich conductive channels.•The coating effectively inhibits manganese dissolution as well as improving the charge transfer rate and rate performance. 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.