CMC binder lithium ion batteries

In addition to the adhesive properties of general binders, lithium-ion battery electrode binder materials also need to withstand the swelling and corrosion of the electrolyte, as well as the electrochemical corrosion during charge and discharge processes, and remain stable within the electrode's operating voltage range. Therefore, the number of polymer materials that can be used as lithium-ion battery electrode binders is limited. Basic requirements:
 

* Disperses negative electrode active materials and conductive agents.
* Thickens and prevents sedimentation of negative electrode slurry.
* Stabilizes electrode processing performance and helps improve battery cycle performance.
* Increases electrode peel strength.
 

Battery Grade CMC Features and Applications

1. Battery adhesive CMC exhibits extremely high slurry stability, ensuring stable processing;
2. Improves the adhesion between graphite and the negative electrode, thereby extending the lifespan of the cell;
3. Low dosage and high efficiency, significantly reducing the content of inactive components in the cell.
4. CMC is also an excellent binder for high-capacity silicon negative electrode materials. The carboxyl functional groups in CMC form hydrogen bonds or covalent bonds with the silicon oxide (SiOx) and silanol (-Si-OH) groups on the silicon surface, enhancing the adhesion between silicon particles and the current collector.
 

Basic Requirements for CMC for Lithium:  

- CMC ensures good hydrophilicity and solubility of the product, allowing it to dissolve completely in water without free fibers or impurities.

- Uniform degree of substitution and stable viscosity provide consistent viscosity and adhesion.
- Produces high-purity products with low metal ion content.

The specific effects of CMC (Concentrated Metal Membrane) in lithium-ion battery anode materials applications as a cathode and anode binder are as follows:

* Improves the bonding of electrode active materials, conductive agents, and current collectors.
* Securely fixes the electrode material to the current collector.
* Excellent conductivity reduces the impedance between the electrode material and the current collector.
* Excellent electrochemical properties enable larger battery capacity.
* Better thermal stability improves battery cycle stability and cycle life.
* Good electrochemical stability and stable properties with electrode materials and electrolytes.
* Buffers volume expansion/contraction during lithium-ion battery charging and discharging; requires less material, provides good bonding strength, and results in low battery discharge load.
* Safe, environmentally friendly, and low-cost.