Mechanical process for enhancing metal hydride for the anode of a Ni-MH secondary battery
- Central Research Inst. of Electric Power Industry, Tokyo (Japan)
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. The authors 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.
- OSTI ID:
- 5567957
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:11; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
ADSORPTION
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
ANODES
COBALT ADDITIONS
COBALT ALLOYS
COMMINUTION
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
GRINDING
HYDROGEN
MACHINING
METAL-NONMETAL BATTERIES
NICKEL ALLOYS
NONMETALS
SORPTION