NOVELTY - Preparation of lithium carboxymethylcellulose comprises preparing carboxymethylcellulose acid by dispersing sodium carboxymethylcellulose in an organic solvent, mixing with a hydrochloric aqueous solution, washing crude carboxymethylcellulose acid with 80-95 vol.% organic solvent, performing hydration, drying, and crushing; and dispersing the carboxymethylcellulose acid in the organic solvent, and adding lithium hydroxide monohydrate aqueous solution, neutralizing using glacial acetic acid, dehydrating, washing with organic solvent, performing hydration, drying, and crushing.    USE - Method for the preparation of lithium carboxymethylcellulose used for a lithium battery (claimed).    ADVANTAGE - The method obtains lithium carboxymethylcellulose having different degrees of substitution and different viscosities, and having excellent water solubility. It is inexpensive, and improves cyclical stability and discharge capacitance of the lithium battery.    DETAILED DESCRIPTION - Preparation of lithium carboxymethylcellulose comprises:    (A) preparing carboxymethylcellulose acid by dispersing sodium carboxymethylcellulose obtained by slurry packing in an organic solvent, and mixing with a hydrochloric (HCl) aqueous solution to obtain a mixed solution; reacting the mixed solution at 20-50 degrees C, and separating out the liquid to obtain a crude carboxymethylcellulose acid; and washing the crude carboxymethylcellulose acid with 80-95 vol.% organic solvent, where the carboxymethylcellulose acid having a high degree of substitution can be washed by using a high-concentration organic solvent, performing hydration, drying, and crushing; and    (B) dispersing the carboxymethylcellulose acid in the organic solvent, and adding lithium hydroxide monohydrate (LiOH.H2O) aqueous solution to obtain a mixed solution; reacting at 40-60 degrees C, and neutralizing the solution using glacial acetic acid until pH is 6-8 to obtain a crude lithium carboxymethylcellulose; and dehydrating the crude lithium carboxymethylcellulose, washing with 75-85% organic solvent, performing hydration, drying, and crushing.