TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The lithium salt is chosen from lithium tetrafluoroborate, lithium trifluorochloroborate, lithium hexafluorophosphate, lithium hydrogen sulfate, lithium perchlorate, lithium hexafluoroarsenate, lithium tosylate and lithium hexafluoroantimonate. The surface of polymer substrate further contains inorganic particles chosen from aluminum oxide, silicon dioxide, titanium dioxide, calcium carbonate, zirconium oxide, barium titanate and lithium titanium phosphate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The insulating film contains onium salt structure-containing compound of formula (I) or (II). The monomer (B) is chosen from N-vinylpyrrolidone, vinylthiophene, vinylpyridine, vinylimidazole, vinylpyrazine, vinylbenzylamine, vinylthiazole, vinylquinoline, diphenylvinylphosphine, 4-(4-(dimethylamino)styryl)pyridine, allyl(diphenyl)phosphine, 2-(4-vinylphenyl)-N,N-dimethylethanamine, N,N-dimethylaminopropyl methacrylate, 1-(3-pyridyl)-3-(dimethylamino)-2-propen-1-one, 6-(dimethylamino)fulvene, 2-isopropenyl pyridine and triallyl phosphine. The halogenated hydrocarbon is chosen from benzyl bromide, methyl iodide, n-bromobutane, 2,5-dichlorobenzyl bromide, 3,5-dibromobenzyl bromide, 2-bromobenzyl chloride, o-benzyl chloride, 1,4-dibromobutane, 1,3-dibromopropane, 1,3,5-tris(bromomethyl)benzene, tetrabromobutane, 1,2,3-tribromobutane, 1,4,6-trichloronaphthalene and 1,5-dibromopentane. The halogenated olefin is chosen from chloromethyl styrene, 1-chloro-3-isopropylbenzene, 1-bromo-4-prop-2-enyl-benzene, 1,2-dichloro-4-ethylbenzene, 4-vinylbenzyl chloride, 1-(chloromethyl)-2-vinyl-benzene, 2-chloroacrylic acid, 1-chloro-2-butene, 4-chloro-1-butene, 4-bromo-1-butene, 1,4-dibromo-2-butene and chloro-2-methylbutane. The monomer (E) is chosen from pyridine, imidazole, thiazole, 2-pyridyl disulfide, 4,4'-bipyridine, trimethylphosphine, terpyridine and tetrapyridine.A=polymer substrate main chain;B'+X-=onium salt structure formed by reacting monomer (B) of formula (i) and halohydrocarbyl, or onium salt structure formed by reacting monomer (B) and halohydrocarbyl, and then ion-exchanging with lithium salt;X-=halo of halohydrocarbyl, or anion portion of lithium salt;D'=residue obtained by reacting monomer (B) and halohydrocarbyl;R1-R4=H, heterocyclyl containing N, P or S, or its derivative, aryl containing N, P or S, aliphatic compound containing N, P or S, aryl which does contain N, P or S, or aliphatic compound which does not contain N, P or S, where at least one of R1-R4 contains N, P or S, R1 and R2 are not heterocyclyl containing N, P or S, or its derivative, or aryl containing N, P or S, simultaneously, and R3 and R4 are not heterocyclyl containing N, P or S, or its derivative, or aryl containing N, P or S, simultaneously;G=residue obtained by reacting haloolefin and monomer (E) containing N, P or S;E+Y'-=onium salt structure formed by reacting monomer (E) and haloolefin, or onium salt structure formed by reacting monomer (E) and haloolefin, and then ion-exchanging with lithium salt;andY'-=halo of haloolefin, or anion portion of lithium salt.The onium salt structure and polymer substrate main chain forms chain structure, cyclic structure and/or mesh structure.