Patent ID: 7575832
Filing Date: 2009-08-18
Classification: H01B,H01M,Y02E,Y02P

Abstract:
1. A separator for high power lithium batteries comprising a sheetlike flexible substrate having a multiplicity of openings and having a porous inorganic electrically insulating coating on and in said substrate, said coating closing the openings in the substrate, the material of said substrate being selected from non-woven electrically nonconductive polymeric fibers and said inorganic electrically insulating coating comprising particles, wherein the separator is an electrical insulator and has lithium ion conducting properties without the presence of an electrolyte and wherein the separator comprises at least one lithium ion conducting material and which lithium ion conducting material is chemically bonded to the inorganic coating, wherein the lithium ion conducting material is an organosilicon compound of formula [(R 1 O) 3 Si—R 2 ]M + , wherein R 1 is methyl or ethyl, M is either H or Li, and R 2 is a bis(perfluoromethylsulfonyl)amide group of formula —CF 2 —SO 2 —N—SO 2 —CF 3 —; or an organosilicon compound of formula [{(RO) y (R 4 ) z } a Si—{R 3 —SO 3 − } b ]M + or [{(RO) y (R 4 ) z }Si—R 3 —PR 5 O 2 − ]M + , wherein R 3 is a linear or branched alkylene group having 1 to 12 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms or a unit of formula wherein l, n, and m are respectively each a number from 0 to 12, M is an H + or a lithium ion, y is a number between 1 and 3, z is a number betweer 0 and 2, y+z=3, a is a number between 1 and 3, b=4−a, R and R 4 are identical or different and are methyl, ethyl, propyl, butyl or H, and R 5 is H, OH, OM or R 3 ; or Li 2 Zr(O 3 P—R—SO 3 ) 2 or Li 4 Zr(O 3 P—R—PO 3 ) 2 , wherein R is a perfluorinated, partly fluorinated or nonfluorinated aryl or alkyl chain having 1-12 carbon atoms.