▎ 摘　　要

NOVELTY - Preparing high-viscosity lithium carboxymethyl cellulose involves mixing cellulose, crosslinking agent, and sodium hydroxide solution in ethanol solution, vacuumizing to remove air, filling nitrogen to form an inert atmosphere, alkalizing under inert atmosphere, etherifying obtained reaction product under normal pressure to obtain a crude sodium carboxymethyl cellulose, acidifying to obtain carboxymethyl cellulose-hydrogen, and adding to a lithium salt-ethanol solution for substitution reaction. USE - The method is useful for preparing high-viscosity lithium carboxymethyl cellulose used in preparation of cathode electrode (all claimed) of lithium-ion battery. ADVANTAGE - The method enables economical preparation of high-viscosity lithium carboxymethyl cellulose, which can be used in reduced amount during the preparation of cathode electrode of lithium-ion battery, and improves electrochemical performance of the material when combined with sodium lignosulfonate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of the high-viscosity lithium carboxymethyl cellulose in preparation of cathode electrode, which involves adding the high-viscosity lithium carboxymethyl cellulose to water, stirring for 2-4 hours, adding sodium lignosulfonate, single-walled carbon nanotubes, and graphene during stirring process, leaving the solution still for 6-24 hours after dissolving lithium carboxymethyl cellulose and sodium lignosulfonate, mixing graphite and conductive carbon black, adding to the obtained solution, dispersing at 850-1500 rpm for 1-3 hours, reducing the dispersing speed to 200-500 rpm, adding styrene-butadiene latex, continuously stirring for 0.5-1 hour to obtain a slurry, adjusting the viscosity of slurry to 3000-7000 mPa.second, coating on a copper foil of a cathode current collector, drying, and rolling.