POLYIMIDE-NETWORK AND POLYIMIDE-UREA-NETWORK BATTERY SEPARATOR COMPOSITIONS
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United States of America Patent
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Issued Date -
Feb 21, 2019
app pub date -
Aug 17, 2017
filing date -
Aug 17, 2017
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Abstract
Polyimide-network battery-separator compositions are disclosed. The polyimide-network battery-separator compositions comprise a porous cross-linked polyimide network comprising a polyamic acid oligomer. The polyamic acid oligomer (i) comprises a repeating unit of a dianhydride and a diamine and terminal functional groups, (ii) has an average degree of polymerization of 10 to 70, (iii) has been cross-linked via a cross-linking agent, comprising three or more cross-linking groups, at a balanced stoichiometry of the cross-linking groups to the terminal functional groups, and (iv) has been chemically imidized to yield the porous cross-linked polyimide network. The polyimide-network battery-separator compositions also comprise an electrolyte composition comprising (i) a room temperature ionic liquid and (ii) a lithium ion. The electrolyte composition is interfused within the porous cross-linked polyimide network. Polyim ide-urea-network battery-separator compositions also are disclosed. Voltaic cells comprising a cathode, an anode, and the polyimide-network battery separator composition or the polyimide-urea-network battery separator composition are also disclosed.
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