Patent ID: 7745057

Claim:
A nonaqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode; a separator; and a nonaqueous electrolyte liquid, wherein a nonaqueous electrolyte liquid is constituted by nonaqueous solvent and nonaqueous electrolyte, wherein the positive electrode contains a positive electrode active material charged at an electric potential higher than 4.3 V based on lithium, the nonaqueous solvent contains a halogenated cyclic carbonate, a cyclic carbonate, and a chain carbonate, wherein the halogenated cyclic carbonate content is 10 to 30 vol % based on the volume of the nonaqueous solvent, the cyclic carbonate content is greater than 0 vol % and less than or equal to 30 vol % based on the volume of the nonaqueous solvent, and the remainder is chain carbonate, and an inorganic insulating material particle layer is formed on the surface of at least either of the positive electrode, the negative electrode and the separator.