Mechanical Process for Enhancing Metal Hydride for the Anode of a Ni‐MH Secondary Battery

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Abstract
This study attempted to find a simpler method for modifying hydrogen storage alloys that are used as anodes in Ni‐MH batteries to prolong their cycle life. The alloy was modified by mechanical grinding with cobalt metal powder. A short grinding time yielded samples with a higher discharge capacity and longer cycle life than those of the alloy which was mixed with the cobalt powder without the mechanical treatment. However, prolonged grinding caused a decrease in the discharge capacity because of amorphization of the alloy by mechanical stress. We believed the formation of a cobalt compound on the alloy surface plus closer contact between particle enhanced the cyclic durability and discharge capacity of metal hydride anodes.

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