▎ 摘　　要

NOVELTY - Binder-free flexible electrode material comprises a graphene film; and a free-standing metal oxide formed on the graphene film. The metal oxide includes alpha -manganese(IV) oxide, beta -manganese(IV) oxide, gamma -manganese(IV) oxide, delta -manganese(IV) oxide, vanadium(V) oxide. The metal oxide is manganese oxide, and the metal oxide precursor solution contains potassium permanganate, sulfuric acid and deionized water. USE - The electrode material is useful in electrode for zinc ion battery (claimed). ADVANTAGE - The electrode material improves energy storage performance, capacity retention rate, and cycling stability by directly forming freestanding metal oxide on graphene film; has excellent flexibility, electrochemical performance and waterproof properties; and can solve problems including decrease in battery capacity and low cycling stability due to the binder by selectively growing metal oxide on graphene film without binder or additive. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing a mixed solution.