Patent ID: 7687202

Claim:
A non-aqueous electrolyte secondary battery comprising: (a) a positive electrode comprising a positive electrode material mixture containing a composite lithium oxide and a positive electrode current collector carrying said positive electrode material mixture; (b) a negative electrode comprising a material capable of absorbing and desorbing lithium; (c) a separator comprising a polyolefin resin; (d) a non-aqueous electrolyte; and (e) a heat-resistant insulating layer interposed between said positive electrode and said negative electrode, said heat-resistant layer comprising an inorganic oxide filler and a resin component, wherein said composite lithium oxide has a composition represented by a general formula (1): Li a M b Me c O 2 , where element M is at least one selected from the group consisting of Al, Mn, Sn, In, Fe, Cu, Mg, Ti, Zn, Zr and Mo, and element Me is at least one selected from the group consisting of Ni and Co, and where said general formula (1) satisfies: 0.9<a<1.2; 0.02≦b≦0.5; 0.5≦c≦0.98; and 0.95 ≦b+c≦ 1.05, wherein b and c are selected so that 0.95≦b+c≦1.05 is satisfied, and wherein said positive electrode active material mixture has an estimated heat generation rate at 200° C. of not greater than 50 W/kg.