Separators for alkaline electrochemical cells
First Claim
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1. An electrochemical cell comprising:
- an anode;
a cathode comprising a cathode active material;
at least one layer of a continuous polymer separator film between the anode and the cathode, the continuous polymer separator film comprising a polymer backbone, electrolyte-retaining side groups coupled to the backbone, and alkaline aqueous electrolyte retained therein; and
,an alkaline aqueous bulk electrolyte in fluid communication with the anode and the cathode, wherein substantially all of the fluid communication is through the continuous polymer separator film, and further wherein the continuous polymer has an Exclusion Value of at least 50%.
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Abstract
The present invention relates to a high capacity electrochemical cell having a cathode containing an oxide of copper as an active material, as well as an anode, an electrolyte, and separators for use with the cathodes of the invention in an alkaline electrochemical cell.
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Citations
44 Claims
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1. An electrochemical cell comprising:
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an anode; a cathode comprising a cathode active material; at least one layer of a continuous polymer separator film between the anode and the cathode, the continuous polymer separator film comprising a polymer backbone, electrolyte-retaining side groups coupled to the backbone, and alkaline aqueous electrolyte retained therein; and
,an alkaline aqueous bulk electrolyte in fluid communication with the anode and the cathode, wherein substantially all of the fluid communication is through the continuous polymer separator film, and further wherein the continuous polymer has an Exclusion Value of at least 50%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An electrochemical cell comprising:
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an anode comprising anode active material; a cathode comprising a cathode active material and at least one anode-fouling soluble species, wherein the cathode active material comprises a compound selected from the group consisting of an oxide of copper, an iodate, copper sulfide, manganese dioxide, copper hydroxide, copper fluoride, copper chloride, copper bromide, copper iodide, a compound comprising Ni, Co, Ag or Pb, and combinations thereof; at least one layer of a continuous polyvinyl alcohol separator film between the cathode and the anode; an alkaline aqueous bulk electrolyte in fluid communication with the anode and the cathode; wherein substantially all of the fluid communication is through the continuous polyvinyl alcohol separator film, and further wherein the continuous polyvinyl alcohol separator film is adapted to effectively limit migration of the at least one anode-fouling soluble species through the continuous polyvinyl alcohol separator film from the cathode to the anode. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification