Electrochemical behaviour of vanadium bronze Li6V5O15 cathode in a secondary lithium battery

被引:12
作者
Hua, SN
Zhong, GL
Jiang, NZ
机构
[1] Department of Chemistry, Shandong University
关键词
vanadium bronze; secondary lithium batteries; lithium insertion reaction; Ac impedance; X-ray diffraction;
D O I
10.1016/S0378-7753(96)02451-2
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
A new vanadium oxide that is rich in lithium (Li6V5O15) has been prepared from Li2CO3 and V2O5 at 680 degrees C for 24 h. The discharge behaviour of the bronze electrode is investigated in an Li/LiAsF6PC/bronze battery at various current densities. The new material has good reversibility for lithium insertion; a high specific capacity (more than 340 Ah kg(-1)) is obtained at 0.2 mA cm(-2) and a 1.0 V cutoff voltage. Given the good structural stability of the bronze with Li+ insertion, 160 cycles are achieved with the tentative battery. A.c. impedance data for the Li/Li6V5O15 cell reveal that the cathodic process is controlled mainly by Li+ diffusion in the bronze. The new bronze could be used for a low-voltage, rechargeable lithium battery.
引用
收藏
页码:93 / 96
页数:4
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