High-purity CMC, also known as CMC cellulose gum, is usually used as adhesive, thickener and suspending agent in the slurry of negative pole of battery. In the production of lithium battery, CMC cellulose gum can be distributed and stabilize non-hydrophilic materials such as graphite, so that the negative coating has good rheological property. Carbon powder and conductive agent are difficult to dissolve in deionized water and are mainly distributed by CMC cellulose gum.
The amount of CMC cellulose gum will directly affect the dispersion of graphite. If there is too much CMC cellulose gum, it cannot disperse graphite. If CMC cellulose gum is not enough, it will destroy the distribution of graphite.
CMC cellulose gum is widely used in silicon-based electrodes because of its thermal stability, conductivity and hydrogen bond effect. CMC cellulose gum can react with silicon, so as to reduce the damage caused by the size expansion of silicon-based electrodes, and contribute to good reciprocating motion. With shear thinning rheology, CMC cellulose gum effectively improves the reversibility of the electrodes and enhances stability.
CMC cellulose gum has a good coating effect on natural graphite, which can effectively improve the interfacial properties and electrochemical properties of natural graphite. Therefore, the cyclic chemical stability of the carbon composites can be effectively enhanced, and the stability and performance of the battery can be improved.