We have conducted surface treatment using an HCl solution for a hydrogen-absorbing alloy to improve the initial charge-discharge characteristics of nickel-metal hydride secondary batteries.As a result, it was found that the surface treatment generated micropores which increase the specific surface area and enrich the Ni and Co metals on the outer surface layer of the alloy particles without affecting their pulverization behavior duringcharge-discharge cycling. Therefore, the surface treatment can activate the initial charge-discharge reaction without affecting the stability against the charge-discharge cycling.
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