Abstract: By using cellulose powder and lithium ethoxide as the raw materials, this paper successfully synthesizes lithium carboxymethyl cellulose (CMC-Li) through IR analysis. With CMC-Li and sodium carboxymethyl cellulose (CMC-Na) being respectively used as the negative electrode binder for lithium-ion batteries, it is found that CMC-Li displays excellent suspension and dispersion performance and does not react with the electrolyte, which shows a good stability. At the same time, under the same conditions, CMC-Li can improve the compaction density of the electrode, increase the liquid absorption rate and amount, reduce the polarization, decrease the internal resistance by about 10% and decrease the physical rebound by about 14.5%. The specific capacity of charge and discharge increases by about 1%, the peeling strength increases by about 9.8%, the first effect increases by about 2%, and the cycle life is extended by about 12%. It has a very excellent lithium supplementation effect.