Non-aqueous electrolyte secondary battery in which a carbon material is added to a negative-electrode active material

Abstract

Provided is a non-aqueous electrolyte secondary battery whose negative-electrode mixture contains a carbon material in addition to spinel-structure lithium titanium oxide (negative-electrode active material), and which realizes positive-electrode deterioration curbing and excellent battery performance. In the non-aqueous electrolyte secondary battery whose negative-electrode active material is mainly constituted by spinel-structure lithium titanium oxide, a carbon material that has a d002 spacing in a range of 0.335 nm to 0.340 nm, inclusive, and a bulk density smaller than 0.1 g/cm3 is added to the negative-electrode active material. Even when overcharged, the non-aqueous electrolyte secondary battery is restrained from undergoing excessive positive-electrode potential increase, and so is capable of largely restraining deterioration of the positive electrode.

Dependencies are inferred from the claim text.