La-Mg-Ni hydrogen storage material

Abstract

The invention discloses a La-Mg-Ni hydrogen storage material with high multiplying power performance and long cycling life. The chemical formula is La1-a-b-c-dSmaYbAcMgaNixA1yRz, wherein A is one or more of Gd, Pr and Nd, R comprises one or more of Co, Mn, Fe, Zn, Sn, Si, Cu, V, Nb, Mo, P, B, Ta, Cr, Ga and In, and the requirements that a>0, b>0, 0<a+b<=0.5, 0<c<=0.2, 0.05<=d<=0.3, 3.2<=x+y+z<=3.8, 0.05<=y<=0.3 and 0<=z<=1.0 are met. The hydrogen storage material is the La-Mg-Ni hydrogen storage material with Ce2Ni7 type phase as a main phase and has good high multiplying power performance and good cycling stability; in addition, the hydrogen storage material is low in cost and can be applied to the cathode of a nickel-metal hydride secondary battery.

Description

technical field [0001] The invention relates to a La-Mg-Ni type hydrogen storage material, in particular to a La-Mg-Ni type hydrogen storage alloy for a nickel-hydrogen battery. Background technique [0002] Nickel-metal hydride secondary batteries have the characteristics of high capacity, good safety, no memory effect and zero pollution to the environment. and many other fields. Hydrogen storage alloys as negative active materials have always been the focus of NiMH battery research. In recent years, with the deepening of research, with AB 3～3.8 The structure of the new rare earth magnesium-based hydrogen storage alloy due to its alloy electrode capacity as high as 360-410mAh / g, much higher than the traditional AB 5 Type hydrogen storage alloys have been gradually applied in commercial production. However, due to the special structure of this type of alloy and the presence of corrosive elements such as Mg, the alloy has problems such as powdering, oxidation, and poor co...

AI Technical Summary

Problems solved by technology

However, due to the special structure of this type of alloy and the presence of corrosive elements such as Mg, the alloy has problems such as powdering, oxidation, and poor corrosion resistance during the charge-discharge cycle. 5 Type alloys are more serious, which affects the performance of battery cycle stability and charge retention rate, which greatly limits the development of its application technology

[0003] Aiming at the problem of poor cycle life of La-Mg-Ni type hydrogen storage alloys, the current methods are mostly to replace La with high content of Pr and Nd elements to improve the cycle stability and charge retention of the alloy.

However, due to the high price of Nd and Pr elements, the cost of La-Mg-Ni type hydrogen storage alloys has been increased.

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