Cooperative effect of Co and Al on the microstructure and electrochemical properties of AB3-type hydrogen storage electrode alloys for advanced MH/Ni secondary battery
Cooperative effect of Co and Al on the microstructure and electrochemical properties of AB3-type hydrogen storage electrode alloys for advanced MH/Ni secondary battery
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DOI：
10.1016/j.ijhydene.2010.08.056
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发表时间：
2011
影响因子：
7.2
通讯作者：
Z. Dong;Liqun Ma;Xiao-dong Shen;Limin Wang;Yao-ming Wu;Lidong Wang
中科院分区：
文献类型：
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作者：
Z. Dong;Liqun Ma;Xiao-dong Shen;Limin Wang;Yao-ming Wu;Lidong Wang
系统研究了La2MgMn0.3Ni8.7−x（Co0.5Al0.5）x（x = 0，1.0，2.0和3.0，at%）贮氢合金的晶体结构和电化学性能。结果表明，合金均由（La，Mg）Ni 3和LaNi 5相组成，60次充放电循环后，合金的循环稳定性S60从61.2%（x = 0）提高到78.7%（x = 3.0），在1200 mA/g放电电流密度下，合金的高倍率放电性能在x = 2.0时出现峰值，其值为68.3%。随着x的增加，合金的电化学动力学性能也有不同程度的提高。结果表明，Co和Al对AB 3型贮氢合金的电化学性能有明显的改善作用，最佳含量为x = 2.0。
The crystal structure and electrochemical properties of the La2MgMn0.3Ni8.7−x(Co0.5Al0.5)x(x = 0, 1.0, 2.0 and 3.0, at%) hydrogen storage alloys are investigated systematically. The results show that all the alloys consist of (La, Mg)Ni3and LaNi5phases, the cyclic stability S60increases from 61.2% (x = 0) to 78.7% (x = 3.0) after 60 charge/discharge cycles, and the peak high rate dischargeability (HRD) at the discharge current density of 1200 mA/g appears at the alloy of x = 2.0 with the value of 68.3%. Moreover, the electrochemical kinetic properties of the alloys are also improved at different extent with increasing x. All the results indicate that the substitution of Co and Al for Ni in AB3-type hydrogen storage alloys is effective to improving the overall electrochemical properties, and the optimum content is x = 2.0.