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Alkaline storage battery and method of producing negative electrode thereof
| Details |
Inventors: Yuasa, Kohji; Ikoma, Munehisa; Kawano, Hiroshi; Takahashi, Osamu; Matsumoto, Isao;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Skapars; Anthony
Assistant Examiner:
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher
Disclosed is an improvement in a negative electrode of an alkaline storage battery, in which the negative electrode is constituted by a hydrogen absorbing alloy capable of absorbing/desorbing hydrogen electrochemically, and a hydrophobic material and a hydrophilic material are provided in a portion of the surface layer of the negative electrode and in the side of the negative electrode respectively so as to properly secure both the wetting property and hydrophobic property of the negative electrode against the alkaline electrolytic solution. Accordingly, a hydrogen can be absorbed electrochemically in the portion of the negative electrode which is wetted by the electrolytic solution and a hydrogen gas generated in charging the battery can be absorbed by a vapor phase reaction in the hydrophobic portion of the negative electrode which is exposed to the vapor phase so that the internal gas pressure can be reduced to thereby make it possible to perform rapid charging. |
|
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described hereunder with respect to various examples.
In the examples, the hydrogen absorbing alloy used for the negative electrode was MmNi.
sub.
3.
55 Co.
sub.
0.
75 Mn.
sub.
0.
4 Al.
sub.
0.
3.
Misch metal Mm (La: about 25 wt.
%, Ce: about 52 wt.
%, Nd: about 18 wt.
%, Pr: about 5 wt.
%) which was a mixture of rare-earth elements was put into an arc furnace together with other metal samples of Ni, Co, Mn and Al.
The furnace was evacuated to obtain a vacuum state of from 10.
sup.
-4 to 10.
sup.
-4 Torr.
Then the metal samples were heated and melted by arc discharging under reduced pressure in an atmosphere of argon gas.
Heat treatment was carried out at 1050.
degree.
C.
for 6 hours in a vacuum to homogenize the metal samples.
The thus obtained alloy was ground roughly and then pulverized by a ball mill to prepare fine powder having a particle size of not larger than 38 .
mu.
m.
By use of the thus prepared hydrogen absorbing alloy powder, the following, 20 kinds of hydrogen absorbing alloy negative electrodes were prepared.
EXAMPLE 1 An aqueous solution of polyvinyl alcohol (hereinafter referred to as "PVA") which was a hydrophilic resin was mixed, by an amount of PVA of 0.
15 wt.
%, into the hydrogen absorbing alloy powder to form paste.
A foamed nickel matrix having a porosity of 95% was filled with the paste and pressed.
Then resin powder of a copolymer of ethylene tetrafluoride and propylene hexafluoride (hereinafter referred to as "FEP") was applied, by an amount of 0.
8 mg/cm.
sup.
2, onto the both surfaces of the negative electrode.
EXAMPLE 2 Water was added to the aforementioned hydrogen absorbing alloy powder to form paste.
A foamed nickel matrix having a porosity of 95% was filled with the paste and pressed.
Then "FEP" was applied, by an amount of 0.
8 mg/cm.
sup.
2, onto the surfaces of the negative electrode.
Thus, a hydrogen absorbing alloy negative electrode in which such a hydrophobic resin was disposed on the surfaces of the negative electrode with no hydrophilic resin disposed in the inside thereof was obtained
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Fuel Cells 
