Study on Degradation and Recovery of AB5-Type Hydrogen Storage Alloy Used in Ni-MH Batteries
来源期刊：JOURNAL OF RARE EARTHS2002年第3期
论文作者：阎杰 周作祥 王荣 高学平 周震 邓斌
Key words：rare earths; Ni/MH battery; overdischarge; hydrogen storage alloy; recovery;
Abstract: The influences of deeply overdischarge on the negative electrode alloy of Ni/MH battery were studied. After overdischarge, La(OH)3 and Al(OH)3 are found to form in the negative electrode through XRD analysis. The hydrogen storage alloy powder from spent Ni/MH batteries was recovered by chemical and melting method according to degradation mechanism. The structure of recovered alloy was measured by XRD. The experimental results demonstrate that the alloy structure is CaCu5 type. The constant-current charge/discharge test was carried out to the original alloy and the recovered alloy. It is found that their discharge capacities are almost the same, but the discharge potential of the recovered alloy is higher than that of the original alloy. The results of cyclic lifetime test demonstrate that the capacity degradation of the recovered alloy is slower than that of the original one.
阎杰1，周作祥1，王荣1，高学平1，周震1，邓斌1
(1.Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China)
Abstract:The influences of deeply overdischarge on the negative electrode alloy of Ni/MH battery were studied. After overdischarge, La(OH)3 and Al(OH)3 are found to form in the negative electrode through XRD analysis. The hydrogen storage alloy powder from spent Ni/MH batteries was recovered by chemical and melting method according to degradation mechanism. The structure of recovered alloy was measured by XRD. The experimental results demonstrate that the alloy structure is CaCu5 type. The constant-current charge/discharge test was carried out to the original alloy and the recovered alloy. It is found that their discharge capacities are almost the same, but the discharge potential of the recovered alloy is higher than that of the original alloy. The results of cyclic lifetime test demonstrate that the capacity degradation of the recovered alloy is slower than that of the original one.
Key words:rare earths; Ni/MH battery; overdischarge; hydrogen storage alloy; recovery;
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