TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The high polymer is polymethylmethacrylate, polyvinylidene fluoride, PTFE (preferably), polyethylene oxide (preferably), polyethylene-polypropylene-polyethylene segmented copolymer, polyvinyl alcohol and/or polyvinyl butyral; the lithium salt is double oxalic acid and boric acid lithium; the organic micromolecule plasticizer is propylene carbonate, ethylene carbonate, butanedinitrile (preferably) or polyethylene glycol, the polymerization degrees of the polyethylene glycol is 2-400 (preferably 10-100); and the inorganic nanoparticle is nano-titanium dioxide particle, nano-aluminum oxide particle, nano-silicon oxide particle (preferably), nano-zirconium oxide particle and/or nano-zirconium oxide particle. The weight-average molecular weight of the high polymer is 5x 104-5x 106 (preferably 1x 105-1x 106); the particle diameter of the inorganic nanoparticle is 1-500 (preferably 5-100) nano; the molar ratio of the structure unit in the high polymer and the lithium salt is 5-30:1 (preferably 15-20:1); the molar ratio of the organic micromolecule plasticizer and the lithium salt is 0.2-5:1 (preferably 1-2:1); and the molar ratio of the inorganic nanoparticle and the lithium salt is 1:0.9-20 (preferably 1:5-10). The solvent is water, ethanol, methanol, acetonitrile, N,N-dimethylformamide, N-Methyl pyrrolidone, acetic acid, ether, acetone, dimethyl sulfoxide, ethyl acetate, petroleum ether and tetrahydrofuran, preferably selecting acetonitrile. The mass ratio of the solvent and the lithium salt is 20-200:1 (preferably 50-100:1); and the adhesive degrees of the mixed liquid is 1-20 (preferably 5-10 Pa.second). Preferred Process: The method comprises adding high polymer to uniformly mix for 3-30 (preferably 8-15) hours, with material forming base comprising PTFE, glass or polypropylene; and drying process under vacuum, air, oxygen, nitrogen, argon, hydrogen, carbon or helium, with vacuum degrees in vacuum atmosphere of - 70 to - 100 (preferably - 58 to - 95) KPa, at - 50 to - 100 (preferably 0-60) degrees C for 1-48 (preferably 6-20) hours.