Structural Evolution of Li2Fe1-yMnySiO4 (y=0, 0.2, 0.5, 1) Cathode Materials for Li-Ion Batteries upon Electrochemical Cycling

被引：59

作者：

Chen, Ruiyong ^{[1
]}

Heinzmann, Ralf ^{[1
]}

Mangold, Stefan ^{[2
]}

Chakravadhanula, V. S. Kiran ^{[1
,3
]}

Hahn, Horst ^{[1
]}

Indris, Sylvio ^{[1
,3
]}

机构：

[1] Karlsruhe Inst Technol, Inst Nanotechnol, D-76021 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, ANKA Synchrotron Radiat Facil, D-76021 Karlsruhe, Germany

[3] HIU, D-89069 Ulm, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 02期

关键词：

LI2FESIO4; POLYMORPHS; CRYSTAL-STRUCTURE; LI2MSIO4; M; NMR; MN; CAPACITY; FE; DIFFRACTION; CO;

D O I：

10.1021/jp310935j

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：

Nanocrystalline Li2Fe1-yMnySiO4 (y = 0, 0.2, 0.5, 1) powders with in situ carbon coating have been prepared by a sol-gel route and their structural evolution during the first electrochemical charge-discharge cycles has been investigated in detail by X-ray diffraction in combination with Li-7 MAS NMR, Fe-57 Mossbauer spectroscopy and in situ X-ray absorption spectroscopy. These results provide detailed information about the amorphization, phase transitions and the partially reversible change in the local environment of Li nuclei upon cycling. The redox processes of the metal cations responsible for the cycling performance of the first few cycles and for the cyclability are also derived from the combined structural characterizations.

引用

页码：884 / 893

页数：10

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