Title:
【発明の名称】電極用水素吸蔵合金の製造方法
Document Type and Number:
Japanese Patent JP3316394
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent charging efficiency in the initial stage from being deteriorated, by specifying a pH value in the treatment of hydrogen storage alloy in acidic solution. SOLUTION: Hydrogen storage alloy is immersed into acidic solution whose initial pH value is 2 or less. Therefore, a layer of oxide on the alloy surface is removed, rare earth elements of Mn, Al having the high ionization tendency in alloy are dissolved, a number of active parts having many Ni compounds appear on the front surface side, and dissolved ion is deposit on the surface of alloy. When pH of acidic solution reaches the specified value in the range of 3 to 5, alloy is taken out and washed in water, and ion deposited on the surface is removed. When alloy is immersed into acidic solution having a pH value equal to a predetermined value, oxide remaining on the alloy front surface is dissolved, a number of active parts having many Ni compounds appear on the alloy front surface. As a result, hydrogen gas is sufficiently absorbed to alloy from the initial stage, and charging efficiency is improved.
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Inventors:
Mitsunori Tokuda
Higashiyama Nobuyuki
Yoshinori Matsuura
Mamoru Kimoto
Mitsuzo Nogami
Ikuro Yonezu
Koji Nishio
Higashiyama Nobuyuki
Yoshinori Matsuura
Mamoru Kimoto
Mitsuzo Nogami
Ikuro Yonezu
Koji Nishio
Application Number:
JP25379096A
Publication Date:
August 19, 2002
Filing Date:
September 03, 1996
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
H01M4/38; H01M4/26; (IPC1-7): H01M4/26; H01M4/38
Domestic Patent References:
| JP4179055A | ||||
| JP688150A | ||||
| JP6223827A | ||||
| JP8185856A | ||||
| JP945318A |
Attorney, Agent or Firm:
Katsuaki Matsukawa