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Rechargeable battery with zinc negative and dendrite barrier

  • US 3,970,472 A
  • Filed: 07/08/1975
  • Issued: 07/20/1976
  • Est. Priority Date: 07/08/1975
  • Status: Expired due to Term
First Claim
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1. In a rechargeable battery having an alkaline electrolyte, and zinc-negative and positive electrodes wherein dendrite growths from the zinc electrode during charge tend to short the battery:

  • a dendrite barrier across the entire face of the zinc electrode including a porous absorbent layer between the zinc electrode and the barrier and a confining separator layer across the outer face of the barrier capable of diffusing the electrolyte but not the dissolved zinc, said barrier comprising a cloth substrate of a porous flexible material, and porous metal deposited on and through said substrate of a low hydrogen over-voltage which on contact with a zinc dendrite reacts with the same to dissolve the dendrite and prevent the same from shorting the adjacent electrode.

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