TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - The separator further has continuous or discontinuous groove (30) formed on the continuous or discontinuous pattern layer. Preferred Properties: The groove has depth of 1-20% of thickness of the porous coating layer, and breadth of 0.1-50 mm.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The inorganic particles are chosen from inorganic particles having permittivity constant of 5 or more, inorganic particles having lithium-ion transfer capability and their mixture. The inorganic particles having permittivity constant of 5 or more is chosen from barium titanate, lead zirconate titanate (Pb(Zrx,Ti1-x)), lead lanthanum zirconate titanate (Pb1-xLaxZr1-yTiyO3), lead magnesium niobate-lead titanate ((1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3), hafnia, strontium titanate, tin dioxide, cerium(IV) oxide, magnesium oxide, nickel oxide, calcium oxide, zinc oxide, zirconium dioxide, silica, yttrium oxide, alumina, silicon carbide and titanium dioxide. The inorganic particles having lithium-ion transfer capability is chosen from lithium phosphate, lithium-titanium phosphate (Lix1Tiy1(PO4)3), lithium-aluminum-titanium phosphate (Lix1AlyTiz(PO4)3), lithium-aluminum-titanium phosphate-type glass ((LiAlTiP)x1Oy2-type glass), lithium-lanthanum titanate (LixLayTiO3), lithium-germanium thiophosphate (Lix2GeyPz1Sw), lithium nitride (Lix2Ny3), silicon sulfide-type glass (Lix3Siy1Sz-type glass) and phosphorus pentasulfide-type glass (LixPySz-type glass).x,y,z1=more than 0 to less than 1;x1,y3=more than 0 to less than 2;x3,y1,z=more than 0 to less than 3;y2=more than 0 to less than 13;x2=more than 0 to less than 4;andz2=more than 0 to less than 7.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The porous base material is polyolefin-type porous base material. The binder polymer is chosen from poly(vinylidene fluoride-co-hexafluoropropylene), poly(vinylidene fluoride-co-trichloroethylene), poly(methylmethacrylate), poly(butyl acrylate), polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyvinyl alcohol, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, styrene butadiene rubber, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose and low-molecular compound having molecular weight of 10000 g/mol. The weight ratio of inorganic particle and binder polymer is 50:50-99:1. Preferred Process: The polyolefin-type porous base material is formed using polymer chosen from polyethylene, polypropylene, polybutylene and polypentene.