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US 7,070,644 B2Granted
Hydrogen absorption alloy electrode
AssigneesMatsushita Electric Industrial Co., Ltd., Toyota Jidosha Kabushiki Kaisha
InventorsShinichiro Ito, Hajime Seri, Kojiro Ito, Shinichi Yuasa, Nobuyasu Morishita
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Abstract
A negative electrode of a battery, chiefly includes hydrogen absorption alloy particles each having a surface layer. The alloy particles satisfy R2/R1≧0.004 and 5 μm≦R1≦20 μm, or preferably 5 μm≦R1≦12.5 μm, where R1 is a half of a median diameter of the particles and R2 is thickness of the surface layers.
Claims13
A hydrogen absorption alloy electrode comprising:
- hydrogen absorption alloy particles comprising at least Ni metal and misch metal, each particle having a surface layer comprising at least Ni metal and misch metal hydroxides and oxides, wherein said alloy particles satisfy R2/R1≧0.004 and 5 μm≦R1≦20 μm, wherein R1 is a half of a median diameter of said alloy particles and R2 is a thickness of said surface layer,
- said electrode being suitable for use in a nickel-metal hydride rechargeable battery.
A nickel-metal hydride rechargeable battery, wherein the battery comprises a hydrogen absorption alloy electrode comprising:
- hydrogen absorption alloy particles comprising at least Ni metal and misch metal, each particle having a surface layer comprising at least Ni metal and misch metal hydroxides and oxides, wherein said alloy particles satisfy R2/R1≧0.004 and 5 μm≦R1≦20 μm, wherein R1 is a half of a median diameter of said alloy particles and R2 is a thickness of said surface layer.
Dependencies are inferred from the claim text.