Open AccessTransformation of electronic state of Co3+ and its influence on the structural development in Li(AlxCo1-x)O2
Author(s) -
Hao Wu,
Li Chang,
Wei Yingjin,
Gang Chen,
Xi Wu
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.1023
Subject(s) - materials science , lithium (medication) , condensed matter physics , microstructure , electron , doping , magnetism , cathode , transformation (genetics) , chemistry , physics , metallurgy , optoelectronics , biochemistry , gene , medicine , quantum mechanics , endocrinology
In this paper we have studied the magnetism of a new cathode material with a high energy density, Li(AlxCo1-x)O2(x=01—05), which is used in rechargeable lithium batteries. We found that doping Al can change the spin state of d electron in Co3+ leading to the emergence of high spin d electrons. Accompanied with this, there are also some changes of the structure development which is indicated by the obviously decreasing rate of the increasing value of c/a. This explains the positive deviation of the structure from the Vegard law. This is very important to the design of the microstructure and properties of materials.