▎ 摘　　要

NOVELTY - Conductive auxiliary agent comprises 100 pts. wt. carbon material, 10-50 pts. wt. polyquaternium-polyacrylate copolymer and 1-20 pts. wt. water-soluble oligomer containing polar nonionic group. USE - Conductive auxiliary agent used in silicon cathode of lithium ion battery (claimed). ADVANTAGE - The conductive auxiliary agent solves problem of uneven dispersion of carbon material in water, ensures that polyacrylate portion is beneficial to transmission of lithium ion, synergistic effect between polyquaternium-polyacrylate copolymer and carbon material effectively inhibits volume change of silicon anode material during cycle and causes electrode material to break, and forms an interpenetrating network in an aqueous system, which strengthens effect of inhibiting expansion of silicon anode.