研究了化学计量比对AB4.8～AB5.2贮氢合金电化学性能的影响.结果表明:在本实验研究范围内,当x=0.1时,贮氢合金电极的0.2 C,1 C和5 C放电容量、高倍率放电特性及3 C循环寿命分别达到324 mAh·g-1,301 mAh·g-1,263 mAh·g-1,0.81和530次.此外,化学计量比对贮氢合金的活化性能和温度特性均有较大的影响,当x分别为-0.2,-0.1,0.0,0.1和0.2时,贮氢合金电极在0.2 C充放电的条件下活化次数分别为3次、4次、7次、5次和6次,且随着x的增大,贮氢电极的高温(45℃,1 C)和常温(25℃,1 C)放电效率下降,低温(-18℃,1 C)放电效率则有增大的趋势.从合金活化性能、大电流充放电特性和循环稳定性来看,x= 0.1时(AB5.1),能得到具有较佳的电化学性能的贮氢材料.
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