▎ 摘　　要

NOVELTY - A graphene-dye nanocomposite comprises graphene oxide and a water-soluble dye. USE - Graphene-dye nanocomposite used in negative electrode material for negative electrode of secondary battery. ADVANTAGE - The three-dimensional graphene-dye nanocomposite has large specific surface area, low electrical resistance, excellent high-efficiency charge/discharge characteristics, electrical conductivity and electrochemical activity and long-term lifespan characteristics, controls the elements doped into the nanocomposite, inhibits the re-stacking and aggregation of graphene by controlling the content, concentration and reaction temperature of graphene oxide and water-soluble dye, and can be prepared without using a dispersant by reducing energy consumption and controlling the temperature and time of the hydrothermal reaction, the three-dimensional structure and specific surface area of the nanocomposite. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of graphene-dye nanocomposite, which involves (A1) mixing graphene oxide and a water-soluble dye to prepare a graphene-dye dispersant, (A2) preparing a hydrogel by hydrothermal synthesis of the graphene-dye dispersant, and (A3) lyophilizing the hydrogel to prepare a graphene-dye nanocomposite; (2) negative electrode material, which comprises the graphene-dye nanocomposite; (3) negative electrode, which comprises the negative electrode material; and (4) manufacture of negative electrode, which involves (B1) preparing an anode material by mixing the anode active material, a binder, and carbon black, (B2) coating the negative electrode material on a current collector, and (B3) heat-treating the coating material at 100-150 degrees C.