Patent ID: 8187748

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 interposed between said positive electrode and said negative electrode, said 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, 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 said positive electrode and said negative electrode are wound together with said separator and said heat-resistant insulating layer interposed therebetween, and wherein said positive electrode material mixture has an estimated heat generation rate at 200° C. of not greater than 50 W/kg.