发明授权
- 专利标题: Metal hydride alkaline storage cell and manufacturing method thereof
- 专利标题(中): 金属氢化物碱性蓄电池及其制造方法
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申请号: US09923963申请日: 2001-08-08
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公开(公告)号: US06852447B2公开(公告)日: 2005-02-08
- 发明人: Yoshinori Matsuura , Mitsuzo Nogami , Reizo Maeda , Katsuhiko Shinyama , Ikuo Yonezu , Koji Nishio
- 申请人: Yoshinori Matsuura , Mitsuzo Nogami , Reizo Maeda , Katsuhiko Shinyama , Ikuo Yonezu , Koji Nishio
- 申请人地址: JP Osaka
- 专利权人: Sanyo Electric Co., Ltd.
- 当前专利权人: Sanyo Electric Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Westerman, Hattori, Daniels & Adrian, LLP
- 优先权: JP9-232177 19970828
- 主分类号: H01M4/24
- IPC分类号: H01M4/24 ; H01M4/26 ; H01M4/36 ; H01M4/38 ; H01M10/24 ; H01M10/30 ; H01M4/58
摘要:
A metal hydride alkaline storage cell of the present invention comprises a positive electrode, a separator impregnated with an electrolyte, and a negative electrode comprising hydrogen-absorbing alloy powder. On the surface of the hydrogen-absorbing alloy powder, there is formed a layer of hydrogen-absorbing alloy oxide, and on the layer of the oxide, there is dotted a catalytic metal or metal compound formed in a granular state by adding a substance soluble in the electrolyte. The substance is selected from the group consisting of a metal fluoride, a metal chloride, a metal iodide, and a metal sulfide. The proportion of the metal fluoride, the metal chloride, the metal iodide, or the metal sulfide in adding, is restricted within the range of from 0.1 to 2.5 wt. % based on the weight of hydrogen-absorbing alloy powder. When the layer of the hydrogen-absorbing alloy oxide is formed on the surface of the hydrogen-absorbing alloy powder, the reaction area on the surface of the hydrogen-absorbing alloy is increased due to the roughness of the layer. Consequently, the catalytic action of the metal is fully utilized by dotting a catalytic metal or metal compound on the alloy surface, and thereby the inner pressure characteristic (high-rate charge characteristic) of a cell is improved.