温度对Ti45Zr35Ni20合金电化学贮氢性能的影响

Influences of temperature on electrochemical properties of Ti_(45)Zr_(35)Ni_(20) hydrogen storage alloy

采用真空熔炼法制备了Ti45Zr35Ni20合金,研究了合金在不同温度下的电化学贮氢性能。结果表明,Ti45Zr35-Ni20电极的电化学性能随着温度而变化,温度从323 K升高到343 K时,电极的活化次数从22次减少到8次,放电容量从86.1 mAh/g增到135.0 mAh/g,快速放电能力也有所提高,然而,高温使电极的循环稳定性显著下降,自放电率增大。

The Ti45Zr35 Ni20 alloy was prepared by vacuum melting method, the electrochemical hydrogen storage characteristics of the alloy have been investigated in different temperature. The results showed that the electrochemical properties of the Ti4sZr35 Ni20 alloy were changed with work temperature of the elec trode. As the temperature increased from 323 K to 343 K, the activation number of the electrode was reduced from 22 to 8,the discharge capacity increased from 86.1 mAh/g to 135.0 mAh/g,and high-rate dischargeability （HRD） also enhanced, respectively. However, the cycle stability of the electrode was significantly dropped increasing work temperature, and the self-discharge rate was also been increased.