Comparison of the Electrochemical Lithiation/Delitiation Mechanisms of FePx (x=1, 2, 4) Based Electrodes in Li-Ion Batteries

被引：74

作者：

Boyanov, S. ^{[1
]}

Zitoun, D. ^{[1
]}

Menetrier, M. ^{[2
]}

Jumas, J. C. ^{[1
]}

Womes, M. ^{[1
]}

Monconduit, L. ^{[1
]}

机构：

[1] Inst Charles Gerhardt Montpellier, CNRS, UM2 ENSCM UMI Agregats Interfaces & Mat Energie C, UMR 5253, F-34095 Montpellier, France

[2] Univ Bordeaux, ICMCB, F-33608 Pessac, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 51期

关键词：

TERNARY LITHIUM PHOSPHIDES; MAGNETIC-PROPERTIES; NEGATIVE ELECTRODES; CRYSTAL-STRUCTURE; MOSSBAUER; ANODE; POLYPHOSPHIDE; REACTIVITY; ARSENIDES; INSERTION;

D O I：

10.1021/jp906080j

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 electrochemical reaction mechanisms of FePx (x = 1, 2, 4) as electrode materials in Li batteries were analyzed by Fe-57 Mossbauer spectroscopy, magnetic and NMR measurements. Depending on their stoichiometry, iron phosphides react with lithium along different pathways. FeP and FeP2 are fully or partially converted to a composite electrode of Li3P and Fe. For both, the same intermediate phases, namely FeP and LixFeP, were identified in cycling and FeP is partially regenerated on charge. Surprisingly, FeP4 reacts with Li through an insertion type process previously identified for earlier transition metal phosphides (Ti, V, and Mn), and no conversion reaction to Li3P/Fe is observed. The long-term stability of the composite electrode Li3P/Fe-0 and of the intermediate phase LixFeP is analyzed.

引用

页码：21441 / 21452

页数：12

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