▎ 摘　　要

NOVELTY - A benzotriazole compound (I), its stereoisomer or tautomer, is new. USE - New benzotriazole compound (I) used as binder in preparation of carbon-coated copper foil for lithium battery (all claimed). ADVANTAGE - The compound (I) has excellent adhesive force under the condition of low usage amount, and provides carbon-coated copper foil having low resistance, strong bonding force, corrosion resistance, water resistance and solvent resistance due to the passivation effect of benzotriazole structure on the copper foil. DETAILED DESCRIPTION - A benzotriazole compound of formula (I), its stereoisomer or tautomer, is new. R1= 1-4C alkyl; and R2= 1-6C alkylene. INDEPENDENT CLAIMS are included for the following: (1) binder, which comprises the compound (I); and (2) preparation of carbon-coated copper foil, which involves adding a dispersant and a dispersing additive into a solvent to disperse, adding a conductive agent and the binder to obtain a carbon-coating slurry, coating the slurry as a film on a copper foil, and drying the coated copper foil.