温度对Ni/MH电池储氢合金负极电化学性能影响的研究  

Influence of temperature to the electrochemical property of hydrogen storage alloy electrode in Ni/MH battery

作　　者：刘文平[1,2,3] 秦海青[1,2,3] 林峰[1,2,3] 张振军[1,2,3] 张建伟[1,2,3] 雷晓旭[1,2,3] 

机构地区：[1]中国有色桂林矿产地质研究院有限公司,桂林541004 [2]国家特种矿物材料工程技术研究中心,桂林541004 [3]广西超硬材料重点实验室,桂林541004

出　　处：《化工新型材料》2016年第8期221-223,共3页New Chemical Materials

摘　　要：为了揭示温度对Ni/MH电池储氢合金负极电化学性能的变化规律和机理,以真空电弧熔炼法制备AB5型LaNi4.1Co0.6Mn0.3储氢合金为Ni/MH电池负极材料,研究了其在-35、0、30和50℃4个测试温度下的电化学性能。研究表明:随着温度的升高,合金电极的放电电压、容量和高倍率性能呈现先增加后降低的趋势,在30℃时合金电极的综合性能最优。在低温条件下,合金电极表面电荷转移速度和合金内部氢原子扩散能力降低导致高倍率性能恶化,高温条件下,储氢合金腐蚀加剧和氢化物稳定性显著降低合金电极的放电容量。In order to reveal the effect of temperature to the electrochemical properties of hydrogen storage alloy in Ni/MH battery anode and its mechanism, ABs type LaNi4.1 Coo. 6 Mn0. 3 was prepared by arc-furnace melting under argon at- mosphere. The electrochemical properties at --35℃, 0℃, 30℃ and 50℃ were studied. It can be found that the discharge voltage, capacity and high-rate dischargeability firstly increased and then decreased with the increase of temperature. The comprehensive performance of alloy electrode reached optimum at 30℃. At low temperature, the worse high-rate discharge- ability properties was attributed to the degradation of both charge transfer on the electrode surface and hydrogen diffusion in the alloy. At high temperature, the discharge capacity decreased because of the corrosion increased and the stability of hy- dride reduced.

关 键 词：储氢合金 高倍率 交流阻抗 电化学动力学 温度 

分 类 号：O646.54[理学—物理化学]