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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 variation law and mechanism of temperature on electrochemical performance of Ni / MH battery hydrogen storage alloy, AB5-type LaNi4.1Co0.6Mn0.3 hydrogen storage alloy was prepared by vacuum arc melting as Ni / MH battery anode material. Electrochemical performance at 4 test temperatures of -35, 0, 30 and 50 ° C. The results show that with the increase of temperature, the discharge voltage, capacity and high rate performance of alloy electrode first increase and then decrease, and the alloy electrode has the best comprehensive performance at 30 ℃. Under the condition of low temperature, the charge transfer rate on the surface of alloy electrode and the diffusion ability of hydrogen atoms in the alloy decreased, which led to the deterioration of high rate performance. The hydrogen storage alloy corrosion and hydride stability at high temperature significantly decreased the discharge capacity of the alloy electrode.