| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery excellent in cycle characteristics.SOLUTION: The nonaqueous electrolyte secondary battery according to an embodiment includes: a positive electrode containing at least a positive electrode active material; a negative electrode containing at least a negative electrode active material; and a nonaqueous electrolyte. The electrolyte contains an organic solvent in which a lithium salt is dissolved and an additive. The negative electrode active material contains a carbonaceous material and at least one or more selected from the group consisting of at least one metal selected from Si and Sn, an oxide of the metal, and an alloy containing the metal. The fluorine concentration in a coating film formed on the metal, the oxide of the metal, or the alloy containing the metal in the negative electrode active material is higher than that in a coating film formed on the carbonaceous material. |
