Rare earth hydrogen storage alloy, electrode, battery and preparation method and heat treatment method thereof

By optimizing the composition and heat treatment process of rare earth hydrogen storage alloys, the problems of insufficient cycle stability and discharge capacity of rare earth hydrogen storage alloys were solved, achieving the effect of high cycle stability and large discharge capacity.

CN118389907BActive Publication Date: 2026-07-10BAOTOU RESEARCH INSTITUTE OF RARE EARTHS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOTOU RESEARCH INSTITUTE OF RARE EARTHS
Filing Date
2024-04-19
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing rare earth hydrogen storage alloys have insufficient cycle stability and discharge capacity, and there are problems with uniformity and poor sphericity during the preparation process.

Method used

A rare earth hydrogen storage alloy with a specific composition and a heat treatment method were used to form spherical alloy powder by gas atomization, and then heat-treated at 700-1100℃ for 30-150h. The elemental composition and heat treatment parameters were optimized to improve the sphericity and uniformity of the alloy.

Benefits of technology

It significantly improves the cycle stability and discharge capacity of rare earth hydrogen storage alloys, with a capacity retention rate of over 68% after 500 cycles, and enhances the alloy's resistance to pulverization and performance stability.

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Abstract

This invention discloses a rare-earth hydrogen storage alloy, an electrode, a battery, and their preparation and heat treatment methods. The rare-earth hydrogen storage alloy of this invention is La. a M b Y c Q d Ni x Mn y Z z Wherein, M is selected from one or more of Ce, Pr, Nd, Pm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sc; Q is selected from one or more of Sm, Gd, and Mg; and Z is selected from one or more of Al, Fe, Co, Si, V, Cu, Sn, Ti, Zr, Cr, Zn, and Mo; 0.5≤a≤3.5, 0≤b≤1.5, 2.5≤c≤5, 0≤d≤1.5, 14≤x≤23, 0.3≤y≤2.5, and 0≤z≤1.5; the capacity retention rate of the rare earth hydrogen storage alloy after 500 cycles is ≥68%. This rare earth hydrogen storage alloy has good cycle stability.
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