Phase transition in the spinel Li4Ti5O12 induced by lithium insertion -: Influence of the substitutions Ti/V, Ti/Mn, Ti/Fe

被引：140

作者：

Kubiak, P ^{[1
]}

Garcia, A ^{[1
]}

Womes, M ^{[1
]}

Aldon, L ^{[1
]}

Olivier-Fourcade, J ^{[1
]}

Lippens, PE ^{[1
]}

Jumas, JC ^{[1
]}

机构：

[1] Univ Montpellier 2, Lab Agregats Mol & Mat Inorgan, CNRS, UMR 5072, F-34095 Montpellier 5, France

来源：

JOURNAL OF POWER SOURCES | 2003年 / 119卷

关键词：

Li4Ti5O12; anode; Li-ion batteries; insertion mechanisms; Fe-57 Mossbauer data;

D O I：

10.1016/S0378-7753(03)00186-1

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：

The spinel Li4Ti5O12, a stable phase of the Li2O-TiO2 system, allows to insert three Li atoms per formula unit at a potential of 1.5 V on the basis of a spinel <----> NaCl phase transition. This mechanism leads to a reduction of three Ti(IV) atoms out of five, corresponding to a theoretical capacity of 175 mAh/g. The influence of structural defaults on the spinel --> NaCl phase transition and its reversibility during charge/discharge cycles have been studied. Solid solutions formed from chemical insertion of lithium or substitutions Ti/V, Ti/Mn, Ti/Fe modify the cation distribution on the crystallographic sites (tetrahedral 8a, octahedral 16d, space group Fd3m) and influence the electrochemical performances. A structural analysis by X-ray and neutron diffraction, X-ray absorption, Fe-57 Mossbauer spectroscopy and first principle calculations have allowed to establish a relationship between the structure and the electrochemical properties. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：626 / 630

页数：5

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