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Effect of Temperature on Structure and Electrode Properties of LaNi3.8Co0.6Mn0.3M0.3 Hydrogen Storage Alloys
作者姓名:李 斯  周怀营  刘文平  张怀刚  邓健秋  王仲民
作者单位:桂林电子科技大学 广西信息科学实验中心,广西 桂林 541004
基金项目:National Natural Science Foundation of China (51261003); National Key Basic Research Development Program of China (“973” Program) (2010CB631303); Natural Science Foundation of Guangxi (2012 GXNSFGA060002, 2011GXNSFD018004)
摘    要:对LaNi3.8Co0.6Mn0.3M0.3 (M=Ni, Al, Cu)储氢合金在238,273,303和323 K温度下的结构和电化学性能进行了一系列的实验研究。A,B,C分别代表LaNi4.1Co0.6Mn0.3(Ni替代),LaNi3.8Co0.6Mn0.3Al0.3(Al替代)和LaNi3.8Co0.6Mn0.3Cu0.3(Cu替代)3种储氢合金,通过X射线衍射仪分别对样品A,B,C的结构进行了研究,对样品A,B,C合金粉末制成的电极进行了模拟电池测试。结果证实,制备的合金均由具有CaCu5型六方晶格结构的LaNi5相构成。3种合金中,Cu替代的合金电极低温性能得到改善,Al替代的合金电极高温放电能力得到提高。交流阻抗图谱分析表明,B合金电极样品的高温放电能力提高是由于合金电极表面形成的致密氧化膜层减缓了合金腐蚀所致,样品B,C的高倍率性能衰退是由于电极表面的充放转移反应和氢原子扩散速率下降造成的,而样品C的优良低温性能则是合金电极表面高的充放电转移反应速率所致。

关 键 词:储氢合金  LaNi3.8Co0.6Mn0.3M0.3  电极性能  高倍率放电能力  宽温

Effect of Temperature on Structure and Electrode Properties of LaNi3.8Co0.6Mn0.3M0.3 Hydrogen Storage Alloys
Li Si,Zhou Huaiying,Liu Wenping,Zhang Huaigang,Deng Jianqiu and Wang Zhongmin.Effect of Temperature on Structure and Electrode Properties of LaNi3.8Co0.6Mn0.3M0.3 Hydrogen Storage Alloys[J].Rare Metal Materials and Engineering,2015,44(7):1591-1956.
Authors:Li Si  Zhou Huaiying  Liu Wenping  Zhang Huaigang  Deng Jianqiu and Wang Zhongmin
Affiliation:Guangxi Experiment Center of Information Science, Guilin University of Electronic Technology, Guilin 541004, China
Abstract:A series of experiments have been performed to investigate the temperature effects on the structure and the electrochemical properties of LaNi3.8Co0.6Mn0.3M0.3 (M=Ni, Al, Cu) hydrogen storage alloys at different temperatures of 238, 273, 303 and 323 K. Samples A, B and C were used to represent LaNi4.1Co0.6Mn0.3 (Ni substituted alloy), LaNi3.8Co0.6Mn0.3Al0.3 (Al substituted alloy) and LaNi3.8Co0.6Mn0.3Cu0.3 (Cu substituted alloy), respectively. The structures and the electrochemical properties of A, B and C hydrogen storage alloys were investigated by XRD and simulated battery test, respectively. The results reveal that all of the alloys are composed of the homogeneous LaNi5 phase with a CaCu5-type hexagonal structure. The low-temperature properties of the Cu substituted alloy are improved, and the high-temperature discharge capacity of the Al substituted alloy is enhanced. Electrochemical impedance spectroscopy (EIS) analysis shows that the improvement of high-temperature discharge capacity of alloy electrode B is attributed to the formation of dense oxide film to protect the active material from corrosion, which is not favorable to charge-transfer reaction at the interface of electrode-electrolyte. The deterioration in the high-rate dischargeability (HRD) of alloy electrodes B and C are attributed to the degradation of electrochemical kinetics, including both charge-transfer reactions on the electrode surface and hydrogen diffusion in the bulk. Furthermore, the good low-temperature performance of alloy electrode C is due to the improvement of charge-transfer reaction.
Keywords:hydrogen storage  LaNi3  8Co0  6Mn0  3M0  3 alloy  electrode property  high-rate dischargeability (HRD)
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