Mossbauer spectrometry as a powerful tool to study lithium reactivity mechanisms for battery electrode materials

被引：10

作者：

Aldon, L ^{[1
]}

Kubiak, P ^{[1
]}

Picard, A ^{[1
]}

Lippens, PE ^{[1
]}

Olivier-Fourcade, J ^{[1
]}

Jumas, JC ^{[1
]}

机构：

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

来源：

HYPERFINE INTERACTIONS | 2004年 / 156卷 / 01期

关键词：

electrode materials; lithium insertion mechanism; titanium-based oxides; Fe-57 Mossbauer data;

D O I：

10.1023/B:HYPE.0000043271.05774.35

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

The use of Fe-57 as a local Mossbauer probe is of high interest for studying mechanisms induced by lithium insertion. In this way the substitutions Ti/Fe and Li/Fe have been carried out for Li4Ti5O12 to obtain Fe substituted spinel and Li2Ti3O7 ramsdellite. In the case of Li4Ti5O12 iron ions are reduced (Fe-III --> Fe-II), then migrate from tetrahedral to octahedral sites allowing us to establish the spinel <----> rocksalt phase transition. Such phase transition definitively explains the well-defined plateau observed in the electrochemical potential curves. In the case of Li2Ti3O7 ramsdellite, all the iron ions are located on octahedral sites and the quadrupole splittings are related to the number of lithium in the neighbourhood of probed atoms.

引用

页码：497 / 503

页数：7

共 8 条

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