期刊
JOURNAL OF POWER SOURCES
卷 110, 期 1, 页码 52-56出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-7753(02)00217-3
关键词
manganese dioxide; birnessite; rechargeable lithium battery; drying condition; cyclability; substitution
We measured the electrode performance of Na-birnessite, which is layered manganese dioxide with sodium ions and water in the interlayer, for use in rechargeable lithium batteries. We focused on the effects of water on the electrode performance. X-ray diffraction (XRD) measurement and thermogravimetric (TG) analysis indicated that the weight loss on heating the material at 100 degreesC corresponded to the removal of surface water with no structural change, while that at 150 degreesC was associated with the removal of lattice water, leading to the layer shrinkage. According to this result, we prepared three kinds of electrode samples with different drying conditions, and examined the effect on the electrode performance. Furthermore, to improve the cyclability, we synthesized samples in which cobalt was substituted for some of the manganese. Even with a large substitution ratio of over 30%, we obtained the same initial capacity as the non-substituted sample, and the cyclability was improved. We assume that the substituted cobalt fixed sodium ions in the interlayer in the form of pillars that stabilized the layer structure. (C) 2002 Elsevier Science B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据