In situ transmission X-ray absorption fine structure analysis of the Li deintercalation process in Li(Ni0.5Co0.5)O2

被引：127

作者：

Nakai, I ^{[1
]}

Nakagome, T ^{[1
]}

机构：

[1] Tokyo Univ Sci, Fac Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 162, Japan

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 1998年 / 1卷 / 06期

关键词：

D O I：

10.1149/1.1390705

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electronic structures of Ni and Co in a solid solution Lil-x(Ni0.5Co0.5)O-2 are clarified as a function of x for the first time by in situ transmission X-ray absorption fine structure (XAFS) analysis using an electrochemical cell of original design. XAFS analysis discloses that oxidation of the Ni ion in Lil-x(Ni0.5Co0.5)O-2 occurs immediately when the cell is charged, then stops at x = 0.5, whereas the oxidation of Co continues slowly to x = 0.8. The Jahn-Teller distortion of the NiO6 octahedra in Li(NiO0.5Co0.5)O-2 decreases with Li deintercalation. When the solid solution is used as a cathode of the Li secondary battery, the Ni ions play a principle role in the initial stage of the charging process. (C) 1998 The Electrochemical Society. S1099-0062(97)09-019-6. All rights reserved.

引用

页码：259 / 261

页数：3

共 16 条

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