▎ 摘　　要

NOVELTY - Manufacture of active material particles involves preparing a mixed solution (M1) by mixing aqueous solution (A1) comprising lithium into aqueous solution (A2), preparing a mixed solution (M2) by mixing the mixed solution (M1) and aqueous solution (A3) and obtaining particles of a compound comprising lithium, metal and oxygen by mixing the mixed solution (M1) and the aqueous solution (A3).At least one of the aqueous solution (A1), aqueous solution (A2) and aqueous solution (A3) comprises graphene oxide and metal. USE - Manufacture of active material particles used in electrode of power storage device. Uses include but are not limited to mobile phone, notebook personal computer, cellular phones, cellular phone devices, tablet personal computers, cameras, video cameras, digital photo frames, etc. ADVANTAGE - The method enables manufacture of the positive electrode of the lithium ion battery without separately preparing a conduction auxiliary agent and/or a binder. The positive electrode active material has increased contact area with respect to electrolyte solution and provides batteries with large charging and discharging capacity and cycle characteristics. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of lithium ion battery. Positive electrode current collector (400) Positive electrode active material layer (401) Positive electrode (402) Negative electrode current collector (405) Negative electrode active material layer (406)