| 摘要 |
PROBLEM TO BE SOLVED: To reduce the electric resistance of a negative electrode material to enhance battery performance and enhance productivity by providing metal deposition films for the surfaces of alloy powder and by mutually bonding adjacent deposition films. SOLUTION: Hydrogen storage alloy powder 3 constituting an alloy powder sheet 5 has metal deposition films 6 on the surfaces thereof, and the adjacent metal deposition films 6 of the hydrogen storage alloy powder 3 are mutually bonded. Thereby, the hydrogen storage alloy powder 3 is partially wrapped in a mesh form by the metal deposition films 6, and the hydrogen storage alloy powder 3 is hardly changed into fine powder or collapsed even if heavy-current charge-discharge is repeated, so that the service life of a battery can be extended. Since the metal deposition films 6 have conductivity, the adjacent metal deposition films 6 can be mutually bonded by current-carrying rolling without using a binder, and as a result, the electric resistance of a negative electrode material is reduced, so that the heat generation of the battery is reduced and battery performance can be enhanced. |
