NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A nonaqueous electrolyte secondary battery capable of achieving a high battery performance (e.g., high energy density and high power density) is provided. The nonaqueous electrolyte secondary battery is equipped with a positive electrode having a positive electrode current collector and a positive electrode active material layer that is formed on the positive electrode current collector and includes at least a positive electrode active material and a conductive material. The positive electrode active material includes a lithium-transition metal composite oxide. The conductive material includes a lithium phosphate compound coated, on at least part of the surface thereof, with a conductive carbon, and a proportion of the conductive material in the positive electrode active material layer is 10% by mass or less.

主权项

1. A nonaqueous electrolyte secondary battery comprising an electrode assembly having a positive electrode and a negative electrode, and a nonaqueous electrolyte, wherein
the positive electrode has a positive electrode current collector and a positive electrode active material layer that is formed on the positive electrode current collector and includes at least a positive electrode active material and a conductive material, the positive electrode active material includes at least a lithium-transition metal composite oxide, the conductive material includes a lithium phosphate compound coated, on at least part of the surface thereof, with conductive carbon, the conductive carbon is coated in an amount, per 100 parts by mass of the lithium phosphate compound, of from 40 parts by mass to 80 parts by mass, and a proportion of the conductive material in the positive electrode active material layer is 10% by mass or less when an overall amount of the positive electrode active material layer is 100% by mass.