Electrochemical reaction of lithium with the CoSb3 skutterudite

被引:122
作者
Alcántara, R
Fernández-Madrigal, FJ
Lavela, P
Tirado, JL
Jumas, JC
Olivier-Fourcade, J
机构
[1] Univ Cordoba, Fac Ciencias, Lab Quim Inorgan, E-14004 Cordoba, Spain
[2] Univ Montpellier 2, CNRS, UMR 5617, Lab Physicochim Mat Condensee, F-34095 Montpellier 5, France
关键词
D O I
10.1039/a902060h
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 crystalline solid CoSb3 with the skutterudite structure was used as the starting cathodic material in Lithylene carbonate)ic discharge takes place in two successive plateaux around 0.5 V, leading to a maximum capacity of ca. 800 mA h g(-1). Further cycling leads to higher voltages and a reversible capacity in the range 350-200 mA h g(-1) during the first 10 cycles. The mechanism of the reaction with lithium was studied by X-ray diffraction and FTIR spectroscopy. The first discharge involves the irreversible decomposition of the solid to non-crystalline cobalt and Li3Sb alloy. On cycling, the reversible extraction-insertion of lithium in the antimony alloy takes place. Part of the irreversible capacity is ascribable to the formation of a passivating film on the surface of the electrode material, which contains ROCO2- and CO32- groups. This material shows superior properties relative to a pure antimony electrode and can be considered as an interesting candidate for the negative electrode of lithium-ion cells.
引用
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页码:2517 / 2521
页数:5
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