Structural changes of manganese spinel at elevated temperatures

被引:23
作者
Li, GH
Iijima, Y
Kudo, Y
Azuma, H
机构
[1] Sony Corp, Nishi Battery Labs, Kanagawa 2430021, Japan
[2] Sony Corp, Tech Support Ctr, Kanagawa 2430021, Japan
关键词
spinel; storage performance; phase segregation; X-ray diffraction; EXAFS;
D O I
10.1016/S0167-2738(01)01002-5
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
A chemical synthesis route to Cr-doped and undoped Mn spinet was developed for the purpose of detailed structural analysis for elucidating the relationship between storage performance and structural changes at elevated temperatures. We identified a two-phase segregation in the lithium compositional range of 0.6<x< 1.0 for LixMn2O4, which is in the same region wherein severe degradation upon storage at elevated temperatures was observed for electrochemical cells. These two phases also coexist in Cr-doped spinet in the lithium compositional range of 0.4<x<0.9 for LixCr0.15Mn1.85O4. The investigation by X-ray diffraction (XRD) indicated that the crystallinity of the spinet decreased after storage at elevated temperatures. X-ray absorption fine structure (XAFS) analysis revealed that the Cr-doped samples showed less change in the local structure after storage than the undoped spinet samples. These results suggest that the Cr-doped spinet has higher structural stability at elevated temperatures than the undoped spinet. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:55 / 63
页数:9
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