摘要
针对目前贮氢电极合金不满足军用通信电池要求工作温度范围宽的情况 ,以Ml(NiCoMnTi) 5合金为例 ,系统研究了温度对电化学性能的影响 ;并在此基础上 ,分别以Ti、Zr、Al为添加元素设计新合金 ,研究其在高温下的电化学性能。结果表明 :温度对合金的化学性能有显著影响 ,随温度升高 ,放电容量降低 ,循环稳定性恶化 ,自放电加剧 ,但高倍率放电性能得到改善。在合金中添加Al,可降低氢化物的平衡分解压 ,有效改善高温性能 ,提高高温下的放电容量和高倍离放电容量 ,抑制自放电及循环过程中的容量衰退 ,提高循环寿命 ;在合金中添加Ti和Zr ,使平台压力上升 ,放电容量降低 。
In order to develop some hydrogen storage electrode materials for the ordnance communication battery, the effect of environmental temperature on the electrochemical properties of the Ml(NiCoMnTi) 5 alloy has been systematically investigated. And in order to improve the performances at high temperature, Ti and Zr and Al were respectively added to some new hydroge storage alloys and their electrochemical properties were examined systematically. The results show that the electrochemical properties of the alloys are affected remarkably by the environmental temperature, when the temperature rises, the discharge capacity decreases, the cycling durability and self-discharge property become bad while the high rate dischargeability is enhanced. The results also show that Al is an effective alloying element for improving the electrode properties at high temperature. Al can lower the plateau pressure of the P-C-T curves, considerably improve discharge capacity, high rate dischargeability, self-discharge property and cycling durability at high temperature. But Ti and Zr can not improve the high temperature performances of these alloys.
出处
《兵器材料科学与工程》
CAS
CSCD
2002年第2期18-22,共5页
Ordnance Material Science and Engineering
