▎ 摘　　要

NOVELTY - The battery comprises a positive electrode, which includes a positive electrode active material (100) and a conductive additive. The positive electrode active material includes a composite oxide containing lithium, nickel, cobalt, and manganese. The conductive additive includes a region where the conductive additive is formed. The conductive additive includes carbon fiber, graphene, or multilayer graphene. The superficial portion of the positive electrode active material includes fluorine. The positive electrode active material includes a first surface and a second surface facing in different directions in a cross-sectional view. USE - Lithium-ion secondary battery for use in automobile, such as car, and motor scooter. ADVANTAGE - Lithium-ion secondary battery has improved heat resistance, which improve the safety of the secondary battery. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of a positive electrode active material. Positive electrode active material (100) First Region (101) Second Region (102) Third Region (103)