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US 2010/0062342 A1Published application
Polymer membrane utilized as a separator in rechargeable zinc cells
OwnerLin-Feng Liinventor
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OwnerLin-Feng Liinventor
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A separator for zinc electrode-based cells that is effective in preventing dendrite growth in a zinc rechargeable cell is prepared as A standalone membrane, or as a composite membrane by impregnating the membrane into a nonwoven fabric. Interpenetrating polymer networks are employed by combining two different polymers. The two polymers penetrate each other on a molecular scale so that mechanical strength, water content and conductivity of the membranes can be effectively optimized. Since the water content of membrane can be optimized by introducing high water content polymers other than polyvinyl alcohol, wherein the diffusion of water from the separator membrane when the membrane contacts alkaline electrolyte solution can be largely reduced. Such membranes demonstrate excellent dendrite blocking capability in a practical zinc rechargeable cell.
A separator membrane for electrochemical cells, said membrane comprising:
A method of making a separator for electrochemical cells, said method comprising the step of:
A separator for zinc electrode-based cells, said separator comprising interpenetrating polymer network of cross-linked polyvinyl alcohol and a second polymer selected from the group consisting of polyacrylic acid, polymethylacrylic acid, polysodium methacrylate, and combinations thereof.
Dependencies are inferred from the claim text.