Electrochemical reaction of 5 V cathode LiNi0.4Mn1.6O4

被引：9

作者：

Kanamura, K

Hoshikawa, W

机构：

[1] Tokyo Metropolitan Univ, Grad Sch Engn, Dept Appl Chem, Hachioji, Tokyo 1920397, Japan

[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

SOLID STATE IONICS | 2006年 / 177卷 / 1-2期

关键词：

lithium batteries; 5 V cathode; LiNi0.4Mn1.O-6(4); spinel; oxygen defects;

D O I：

10.1016/j.ssi.2005.10.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

LiNi0.4Mn1.6O4 was prepared under air and oxygen atmospheres using fine Mn3O4 particle and large MnO2 particle at various temperatures. The sample prepared from Mn3O4 at 750 degrees C under air or oxygen atmosphere exhibited an ideal electrochemical behavior, which was based on three redox couples of Mn3+/Mn4+, Ni2+/Ni3+, and Ni3+/Ni4+. On the other hand, the sample prepared from MnO2 had a larger capacity at 4 V plateau and smaller one at 5 V plateau. However, when using oxygen atmosphere, the sample exhibited more ideal behavior, which is similar to the sample prepared from Mn3O4. This means that some defects exist in LiNi0.4Mn1.6O4, depending on preparation conditions. In order to confirm this point, the chemical composition and the valence state of Mn of the prepared sample was analyzed. From these results, it can be said that electrochemical reactions of LiNi0.4Mn1.6O4 are well explained based oil three redox couples of Mn3+/Mn4+, Ni2+/Ni3+, and Ni3+/Ni4+ by considering a presence of oxygen defects. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：113 / 119

页数：7

共 29 条

[1] Optimizing preparation conditions for 5 V electrode performance, and structural changes in Li1-xNi0.5Mn1.5O4 spinel [J].