Electrochemical performance of VOMoO4 as negative electrode material for Li ion batteries

被引:19
作者
Reddy, M. Anji
Kishore, M. Satya
Pralong, V.
Caignaert, V.
Varadaraju, U. V. [1 ]
Raveau, B.
机构
[1] Indian Inst Technol, Math Sci Res Ctr, Madras 600036, Tamil Nadu, India
[2] CNRS, ENSICAEN, Lab CRISMAT, UMR 6508, F-14050 Caen, France
关键词
negative electrode; vanadates; molybdenum oxide; Li-ion battery; discharge capacity; X-ray diffraction;
D O I
10.1016/j.jpowsour.2007.02.089
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
Polycrystalline samples of VOMoO4 are prepared by a solid-state reaction method and their electrochemical properties are examined in the voltage window 0.005-3 V versus lithium. The reaction mechanism of a VOMoO4 electrode for Li insertion/extraction is followed by ex situ X-ray diffraction analysis. During initial discharge, a large capacity (1280 mAh g(-1)) is observed and corresponds to the reaction of similar to 10.3 Li. The ex situ XRD patterns indicate the formation of the crystalline phase Li4MoO5 during the initial stages of discharge, which transforms irreversibly to amorphous phases on further discharge to 0.005 V. On cycling, the reversible capacity is due to the extraction/insertion of lithium from the amorphous phases. A discharge capacity of 320 mAh g(-1) is obtained after 80 cycles when cycling is performed at a current density of 120 mA g(-1). (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:509 / 512
页数:4
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