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    • 84. 发明专利
    • Cell separator
    • GB2606138A
    • 2022-11-02
    • GB202105391
    • 2021-04-15
    • DYSON TECHNOLOGY LTD
    • ALEX MADSENMATTHEW ROBERT ROBERTSDANIEL STEPHEN BOWESLIYU JINRIMAZ RAMEEZREZA PAKZADSTEVEN ROBSON
    • H01M50/414H01M10/0525H01M50/403H01M50/406H01M50/409H01M50/411H01M50/417H01M50/42H01M50/426
    • A separator for a cell comprises a polymer matrix and a plasticiser, wherein the separator is substantially free from electrolyte. The separator is thermally manufactured, e.g. extruded. The polymer matrix preferably comprises one or more compounds selected from polyvinylidene fluoride, poly(vinylidene fluoride-co-hexafluoropropylene), poly(methyl methacrylate), polyethylene oxide, polyacrylonitrile, polyvinyl chloride, polytetrafluoroethylene, polyethylene, and polypropylene. The plasticiser preferably comprises one or more compounds selected from ethylene carbonate, propylene carbonate, gamma-butyrolactone, vinylene carbonate, fluoroethylene carbonate, trimethyl phosphate, sulfolane, tetraethylene glycol dimethyl ether, triethylene glycol dimethyl ether and ethylmethoxyethyl sulfone, and is most preferably one of the carbonates. A method of forming a Li-ion cell using the separator is also disclosed, in which the method involves heating to a temperature above 60°C during formation of the separator, e.g. during extrusion. The electrolyte is then diffused into the separator. It is stated that through adding plasticiser to a composition alongside a polymer, the composition is more readily processed for manufacture into a separator and this addition facilitates manufacture at lower temperatures (typically 50- 60°C lower than temperatures that would be required in the absence of plasticiser). Also, the absence of electrolyte during manufacture (e.g. during extrusion) facilitates processing at elevated temperatures.