Patent ID: 8252462

Claim:
A non-aqueous electrolyte secondary battery comprising: a positive electrode comprising a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector, said positive electrode active material layer including a lithium nickel composite oxide having a layer structure, the lithium nickel composite oxide being represented by the general formula: Li x Ni y M 1-y O 2 where M is at least one selected from the group consisting of Na, Mg, Sc, Y, Mn, Fe, Co, Cu, Zn, Al, Cr, Pb, Sb, and B, 0<x≦1.2 and 0.5<y≦1.0; a negative electrode; a separator between the positive electrode and the negative electrode; a non-aqueous electrolyte including a solute and a non-aqueous solvent dissolving the solute, the non-aqueous solvent containing 60% by weight or more and 90% by weight or less of a cyclic carbonic acid ester; and an insulating layer adhered to a surface of the positive electrode active material layer, the insulating layer being porous and including an insulating polymeric material and insulating inorganic oxide particles.