Nonaqueous electrolyte secondary battery

Abstract

Provided is a nonaqueous electrolyte secondary battery in which the generation of gas is suppressed in charge/discharge cycles. The nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator placed therebetween, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material containing a lithium transition metal oxide. The positive electrode contains tungsten oxide. Tungsten is present in the form of a solid solution in the lithium transition metal oxide. Tungsten oxide is attached to the surface of the lithium transition metal oxide. The separator contains cellulose. Tungsten in tungsten oxide contained in the positive electrode is preferably 0.01 mole percent to 3.0 mole percent with respect to transition metals, excluding lithium, in the lithium transition metal oxide.

Dependencies are inferred from the claim text.