High Performance Study of Lithium Carboxymethylcellulose as Water-Soluble Binder for Lithium Supplementation in Lithium Batteries

Using cotton and lithium ethoxide as raw materials, carboxymethyl cellulose lithium (CMC-Li) is synthesized and obtained, and it is used as a water-based binder in the negative electrode of lithium batteries. The synthesis method of a new type of CMC-Li is mainly studied as a lithium battery negative material binder, and water is used as a dispersant to assemble a battery and the relevant electrochemical performance is tested. CMC-Li as a lithium-replenishing binder for lithium batteries has better electrochemical performance. It can reduce the internal resistance of the battery by about 10%, significantly improve the phenomenon of lithium precipitation, the redox peak is reduced by 50% to 0.20 V, and the impedance is also significantly improved, reducing by more than 50%. Under the same conditions, the cycle period can reach 2500 circles, the lifespan is increased by more than 20%, and the effect of lithium supplementation is obvious. It shows that CMC-Li as a binder can greatly increase the content of lithium ions in the entire lithium battery, and improve the ion conductivity and ion conduction rate, which further verifies the advantages of lithium-replenishing binders.