The application of sodium carboxymethyl cellulose (CMC) in batteries is mainly reflected in the use of binders and stabilizers. Here are some of its specific applications in batteries:
1.*Lithium-ion batteries**: In lithium-ion batteries, CMC acts as a binder and is used to fix the battery's anode material (such as graphite) to the current collector of the battery to improve the battery's electrochemical performance. The study found that the degree of substitution was large (085), CMC with higher molecular weight than lower substitution (065) and molecular weight (250000) CMC has better solubility and higher viscosity, which is easier to completely adsorb on the surface of graphite particles, which is conducive to the stability and coating of the anode slurry system, so that the lithium-ion battery has better electrochemical performance
2.*High Capacity Silicon Anode Materials**: CMC is also an excellent binder for high capacity silicon anode materials. The carboxyl functional groups in CMC and the silicon oxide (Siox) and silanol (-Si-OH) groups on the silicon surface produce hydrogen bonds or covalent bonds, which can enhance the bond between silicon particles and between silicon particles and current collectors
3.*Processing performance of stable electrode**: CMC can stabilize the processing performance of electrode, improve the charging and discharging performance of the battery, stabilize the structure of the electrode, and improve the peeling strength of the electrode
4.*Improved Battery Capacity & Cycle Life**: The optimal amount of CMC adhesive allows for larger battery capacity, longer cycle life and lower internal resistance
5.*Improve slurry settling**: CMC has extremely high slurry stability, which can ensure stable processing, improve the adhesion between graphite and the negative electrode, and thus extend the service life of the unit battery.
In general, the application of sodium carboxymethyl cellulose in batteries is mainly reflected in its excellent bonding, stability and dispersion properties, which have an important impact on the performance of batteries.