TECHNOLOGY FOCUS - ELECTRONICS - Preferred device: The current collector is sheet-like current collector or the mesh-type current collector, and is chosen from hollow collector, wire current collector, winding wire current collector and plane phase current collector.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The conductive material is chosen from carbon black, acetylene black, ketjen black, carbon fiber, carbon nanotube and/or graphene. The porous coating layer further contains inorganic particles. The inorganic particles are chosen from barium titanium oxide, lead zirconate titanate of formula: Pb(ZrxTi1-x)O3, lead magnesium niobate-lead titanate of formula: (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3, where x is 0-1, hafnia, strontium titanate, tin dioxide, cerium(IV) oxide, magnesium oxide, nickel oxide, calcium oxide, zinc oxide, zirconium oxide, yttrium oxide, aluminum oxide, silicon carbide, silicon dioxide, aluminum oxyhydroxide, aluminum hydroxide, titanium oxide, lithium phosphate, lithium titanium phosphate of formula: LixTiy(PO4)3, where x is 0-2 and y is 0-3, lithium aluminum titanium phosphate of formula: LixAlyTiz(PO4)3, where x is 0-2, y is 0-3 and z is 0-3, and (LiAlTiP)xOy where x is 0-4 and y is 0-3, lithium lanthanum titanate of formula: (LixLayTiO3) where x is 0-2 and y is 0-3, germanium lithium thiophosphate of formula: LixGeyPzSw, where x is 0-4, y is 0-1, z is 0-1 and w is 0-5, lithium nitride of formula: LixNy, where x is 0-4, and y is 0-2, lithium silicon sulfide of formula: LixSiySz, where x is 0-3, y is 0-2 and z is 0-4, and lithium phosphorus pentasulfide of formula: LixPySz, x is 0-3, y is 0-2 and z is 0-7. The electrode active material layer comprises metallic oxides or metal alloy. The metal is chosen from silicon, tin, lithium, aluminum, silver, bismuth, indium, germanium, lead, platinum, zinc, magnesium, cadmium, cerium, copper, cobalt, nickel and iron. The cable-type secondary battery contains lithium salt. The lithium salt is chosen from lithium chloride, lithium bromide, lithium iodide, lithium cobalt oxide, lithium tetrafluoroborate, lithium boron chloride (LiB10Cl10), lithium hexafluorophosphate, lithium triflate salt, lithium trifluoroacetate, lithium hexafluoroarsenate, lithium hexafluoroantimonate, chloroborane lithium, low level aliphatic lithium carbonate, tetraphenyl lithium borate, lithium tetrachloroaluminate, lithium trifluorosulfonate, and trifluoromethanesulfonimide. Preferred Properties: The pore formed on porous coating layer has pore size of 0.01-10 mu m, and porosity of 5-95%. The pore formed on conductive material coating layer has pore size of 0.01-5 mu m, and porosity of 5-70%. The inorganic particles have permittivity constant of 5 or more and lithium ion transfer capability. The average particle diameter of the inorganic particles is 10 nm to 5 mu m.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The weight ratio of polymer binder (p1) and conductive material is 1:10-8:10. The weight ratio of polymer binder (p2) and inorganic particle is 10:90-95:5. The polymer binders (p1) and (p2) are chosen from polyvinylidene fluoride, hexafluoro propylene, polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride-trichloroethylene, polybutyl acrylate, polymethyl methacrylate, polyacrylonitrile, polyvinyl pyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, styrene-butadiene rubber, acrylonitrile-styrene-butadiene copolymer and/or polyimide. A gel-type polymer electrolyte in the electrolyte layer of secondary battery comprises polyethylene oxide, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, poly(methyl methacrylate), polyacrylonitrile or polyvinyl acetate. A solid electrolyte in the electrolyte layer of cable-type secondary battery comprises polyethylene oxide, polypropylene oxide, polyethylene imine, polyethylene sulfide or polyvinyl acetate. The cable-type secondary battery comprises porous polymer material containing polymer binder which is chosen from polyester, polyacetate, polyamide, polycarbonate, polyimide, polyether-ether-ketone, polyethersulfone, polyphenylene oxide, polyphenylene sulfate and polyethylenenaphthalate, ethylene homopolymer, propylene homopolymer, ethylene-butene copolymer, ethylene-hexene copolymer, polyolefin-based high polymer and ethylene-methacrylate copolymer.