A unique structure of Ni(III) in LiNi0.3Co0.7O2 without Jahn-Teller distortion

被引：10

作者：

Mansour, AN ^{[1
]}

Croguennec, L

Delmas, C

机构：

[1] USN, Ctr Surface Warfare, Carderock Div, Bethesda, MD 20817 USA

[2] CNRS, Inst Chim Mat Condensee Bordeaux, F-36608 Pessac, France

[3] Univ Bordeaux 1, Ecole Natl Super Chim & Phys Bordeaux, F-36608 Pessac, France

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2005年 / 8卷 / 10期

关键词：

D O I：

10.1149/1.2033621

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We examined the oxidation state and atomic structures of Ni and Co in LiNi0.3Co0.7O2 and compared them with those of LiNiO2 and LiCoO2. The X-ray absorption near-edge structure and extended X-ray absorption fine structure results show that Ni (primarily ) and Co are present with an oxidation state of +3. Ni (III) in LiNiO2 has a distorted octahedral coordination due to an active Jahn-Teller effect as shown previously. However, Ni (III) in LiNi0.3Co0.7O2 has a regular octahedral coordination with six oxygen atoms at a distance of 1.913 angstrom and, hence, the Jahn-Teller effect is inactive. The oxidation state and local atomic structure of Co in LiNi0.3Co0.7O2 are similar to those of LiCoO2. (c) 2005 The Electrochemical Society.

引用

页码：A544 / A548

页数：5