Charge-discharge properties of composites of LiMn2O4 and polypyrrole as positive electrode materials for 4 V class of rechargeable Li batteries

被引：133

作者：

Kuwabata, S ^{[1
]}

Masui, S ^{[1
]}

Yoneyama, H ^{[1
]}

机构：

[1] Osaka Univ, Fac Engn, Dept Appl Chem, Suita, Osaka 5650871, Japan

来源：

ELECTROCHIMICA ACTA | 1999年 / 44卷 / 25期

关键词：

rechargeable Li battery; polypyrrole; LiMn2O4; composite; positive electrode;

D O I：

10.1016/S0013-4686(99)00178-4

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Charge-discharge properties of chemically prepared composites of polypyrrole and spinel LiMn2O4 (LiMn2O4/PPy) have been studied at potentials ranging between 4.3 and 3.2 V vs. Li/Li+. Pellets of LiMn2O4/PPy were successfully prepared by pressing the composite powder without using any binder. Charge-discharge tests of the LiMn2O4/PPy pellet gave a potential plateau around 4 V, indicating that polypyrrole works well as a conducting matrix for the redox reaction of LiMn2O4 reversible arrow Li1-xMn2O4 + xLi(+) + xe(-). The polypyrrole behaved also like a capacitor and contributed to the capacity density of the LiMn2O4/PPy composite: The effects of charge-discharge current densities, the amount of LiMn2O4 in the composite, and cycle tests of charge-discharge reactions were investigated. Elemental analyses of the composites before and after discharging revealed that Li+ and ClO4 were involved in the charge-discharge reactions of LiMn2O4 and polypyrrole, respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：4593 / 4600

页数：8

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