Patent ID: 9583754
Date: 2017-02-28
CPC Classifications: H01M,Y02E

Claim:
1. A non-aqueous electrolyte secondary battery comprising: a positive electrode including a positive electrode mixture layer comprising a positive electrode active material on a positive electrode collector, wherein the positive electrode active material comprises a lithium cobalt oxide, and at least a part of the lithium cobalt oxide is coated with an oxide comprising nickel and manganese; a negative electrode including a negative electrode mixture layer on a negative electrode collector, wherein the negative electrode mixture layer comprises artificial graphite, and a ratio of a surface density of the positive electrode mixture layer to a surface density of the negative electrode mixture layer is from 1.90 to 2.15; a heat-resistant insulating layer-provided separator; and a non-aqueous electrolyte comprising LiPF the non-aqueous electrolyte secondary battery is configured to operate at an open circuit voltage in a completely charged state per pair of the positive electrode and the negative electrode from 4.35 V to not more than 4.55 V, the heat-resistant insulating layer-provided separator includes a polyolefin layer disposed between the positive and negative electrodes, and a heat-resistant insulating layer comprising a heat-resistant resin and oxidation-resistant ceramic primary particles dispersed therein, the oxidation-resistant ceramic primary particles comprise at least alumina, the heat-resistant insulating layer comprises the oxidation-resistant ceramic primary particles in a mass proportion of from 60 to 90% of the mass of the oxidation-resistant ceramic primary particles and the heat-resistant resin, and the heat-resistant resin is an aramid in a fibrous state.