Neutron diffraction study of electrochemically delithiated LiMn2O4 spinel

被引：64

作者：

Berg, H ^{[1
]}

Thomas, JO ^{[1
]}

机构：

[1] Uppsala Univ, Angstrom Lab, SE-75121 Uppsala, Sweden

来源：

SOLID STATE IONICS | 1999年 / 126卷 / 3-4期

关键词：

lithium-ion batteries; electrochemical delithiation; spinel; neutron diffraction;

D O I：

10.1016/S0167-2738(99)00235-0

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：

Partially electrochemically delithiated LiMn2O4 has been studied by a combination of in situ X-ray and ex situ neutron diffraction to help shed further light on structural phenomena in the >4 V range. LixMn2O4 samples were extracted from charged half-cells and their structures refined by the Rietveld method. At ca. 4.1 V, a spinel-phase of composition Li0.74Mn2O4 corresponds to a distinct step in the charging curve, suggestibly related to a Mn3+ (high-spin) to Mn4+ (low-spin) transition. The refined composition for the lambda-MnO2 phase at 4.3 V was Li0.28Mn2O4, and showed no evidence of lithium/hydrogen ion-exchange. Electrochemical delithiation to form the lambda-MnO2 phase is concluded to involve a single spinel phase and not a coexistence of two-phases. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：227 / 234

页数：8

共 22 条

[1] Ion exchange in manganese dioxide spinel: Proton, deuteron, and lithium sites determined from neutron powder diffraction data [J].