Polyimide-network and polyimide-urea-network battery separator compositions

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.

Dependencies are inferred from the claim text.