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J. Japan Inst. Metals, Vol. 66, No. 9 (2002), pp. 861_864
Ý 2002 The Japan Institute of Metals
V_
Based Alloy Prepared by Thermic Process as New Anode Materials for
Lithium Rechargeable Batteries
Hideo Yoshinaga1, Seiji Dan1, Akio Kawabata1 and Tetsuo Sakai2
1Ako
Laboratory, Taiyo Koko Co., Ltd., Ako 678_0232
2Kansai
Collaborative Center, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda 563_
8577
Tin_based alloys are receiving much attention as new anode materials with high energy density for Li_
ion secondary batte­
ries. However, these alloys still show very poor cycle life because charge_discharge processes cause cracking and crumbling of
the anode by large volume changes in the alloys.
In order to overcome the problem, we have proposed vanadium_
based alloys which had very good ductility. Tin_vanadium
alloys were successfully prepared by thermic process in which vanadium_oxide was reduced by Al_metal to vanadium_
metal. The
obtained Sn_V alloys are mainly composed of Sn3V2 phase containing tin impurity. Cycle life of the alloy anode was significantly
improved by annealing it at 750‹
C because the amount of impurity tin was decreased greatly. The Sn3V2 alloy anode showed an in­
itial rechargeable capacity of 500 Ah/kg, keeping 400 Ah/kg even after 50 charge_
discharge cycles.
(Received April 22, 2002; Accepted June 3, 2002)
Keywords: lithium ion batteries, negative electrode material, vanadium alloy, thermic reduction, tin alloy electrode
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