▎ 摘　　要

NOVELTY - Aqueous composite binder is formed by mixing a polymer A comprising a polyethylene oxide (PEO) compound (I) and a polymer B comprising a carboxymethyl cellulose lithium (CMC-Li) compound (II). USE - The aqueous composite binder is used for polymer-based solid-state lithium ion battery system with ferric phosphate lithium positive electrode (claimed) for electric automobile. ADVANTAGE - The aqueous composite binder has excellent multiplying power performance and cycle stability, and is environmentally-friendly and low cost. DETAILED DESCRIPTION - Aqueous composite binder is formed by mixing a polymer A comprising a polyethylene oxide (PEO) compound of formula (I): H-(-O-CH2-CH2-)n-OH, and a polymer B comprising a carboxymethyl cellulose lithium (CMC-Li) compound of formula (II): (C6H7O2(OH)2OCH2COOLi)n. An INDEPENDENT CLAIM is included for an application method of the aqueous composite binder for preparing lithium-ion battery positive electrode sheet, which involves (i) mixing the polymer A with the polymer B, and dispersing in the deionized water to form a uniform solution, (ii) uniformly mixing and grinding the solution obtained in step (i) with conductive agent and positive electrode active material to form a uniform slurry, (iii) coating the slurry obtained in step (ii) on a current collector, vacuum drying, and cutting into lithium-ion battery positive electrode sheets of a certain size.