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Sealed metal oxide-hydrogen storage cell
| Details |
Inventors: Kanda, Motoya; Sato, Yuji; Shincho, Eriko; Mitsuyasu, Kiyoshi;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Walton; Donald L.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
Disclosed is a method of producing a sealed metal oxide-hydrogen storage cell, comprising the step of housing in a container a cathode containing a metal oxide as an active material, an anode containing a hydrogen storage alloy as the main component, a separator for separating the cathode and the anode, a pre-charging member, and an electrolyte solution consisting of an alkaline aqueous solution. The pre-charging member is electrically combined with the anode and consists of a metal having a less noble potential than the hydrogen electrode potential within the alkaline solution. A material containing said metal as the main component may also be used as the pre-charging member. The storage cell has a desired anode-cathode capacity balance and exhibits a long life. |
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DETAILED DESCRIPTION An object of the present invention is to provide a method of producing a sealed metal oxide-hydrogen storage cell comprising a hydrogen storage alloy anode with a desired charge condition.
The method of the present invention makes it possible to produce the desired cell without employing a hydrogen gas atmosphere.
According to the present invention, there is provided a method of producing a sealed metal oxide-hydrogen storage cell, comprising the step of housing in a container a cathode containing a metal oxide as an active material, an anode containing a hydrogen storage alloy as the main component, a separator for separating the cathode and the anode, a pre-charging member electrically combined with the anode and consisting of a metal having a less noble potential than the hydrogen electrode potential within an alkaline solution or a material containing said metal as the main component, and an electrolyte solution consisting of an alkaline aqueous solution.
The pre-charging member electrically combined with the anode permits the anode to be automatically pre-charged in a desired amount during the assembling process such as the sealing step of the storage cell, making it possible to obtain a storage cell having a satisfactory capacity balance of the cathode and anode.
Specifically, a hydrogen storage alloy performs the electrochemical reaction within an alkaline aqueous solution as shown below: ##STR1## where M denotes the hydrogen storage alloy, and M.
H denotes the hydrogen storage alloy having hydrogen stored therein.
The electrode potential of this reaction is substantially equal to that of the so-called "hydrogen electrode reaction.
" Suppose a metal M' has an electrode potential less noble than the potential of the hydrogen electrode reaction.
Usually, such metal undergoes the following electrode reaction in an alkaline solution: ##STR2## where n denote the valence of the metal M' when the metal is dissolved in the solution.
Where the metal M' is electrically combined with the hydrogen storage alloy within an alkaline aqueous solution, the electrode potential exhibited by the connected system is rendered intermediate between the electrode potentials of the two original metals
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