充放电对LaMgNi系储氢合金电化学性能的影响

Effects of Charge and Discharge Conditions on the Electrochemical Properties of LaMgNi System Hydrogen Storage Alloy

研究充放电对LaMgNi系AB_(3.8)型储氢合金电极电化学性能的影响.结果表明:随着充电电流的增加,合金电极的最大放电容量持续增加,放电电势平台加宽,容量保持率先缓慢增大后快速减小;随着放电电流的增加,合金电极的最大放电容量持续减少,放电电势平台明显变窄,容量保持率持续增加.综合考虑,充电电流密度为100mA/g,放电电流密度为60mA/g时,La_(0.75)Mg_(0.25)Ni_(3.3)Co_(0.5)合金电极具有较好的综合电化学性能.

The effects of charge and discharge conditions on the electrochemical properties of LaMgNi system AB_（3.8）-type hydrogen storage alloy were systematically investigated.The results indicated that the maximum discharge capacity and the width of the discharge potential plateau of the alloy electrode increase continuously with increasing charge current density.Moreover,the capacity retaining rate increases slowly at first and then decreases rapidly with the increase of charge current density.The maximum discharge capacity and the width of the discharge potential plateau of the alloy electrode decrease continuously with increasing discharge current.Moreover,the capacity retaining rate increases continuously with the increase of discharge current density.The La_（0.75）Mg_（0.25）Ni_（3.3）Co_（0.5） alloy exhibits the best comprehensive electrochemical performances at a charge current density of 100 mA/g and a discharge current density of 60 mA/g.