Sodium Carboxymethyl Cellulose For Battery Industry

CMC, with the strong cohesion, good heat stability, electrical conductivity and electrochemistry property, makes the active substance and electrolyte form the even and dispersive paste, and takes the hydrogen bond effect with the silicon, therefore, it is not only widely used as the binder of cathode and anode, gel for cathode protection, but also widely applied in the silicon base electrode and graphite modification.

Application in silicon-based electrode

CMC used in the silicon-based electrode, besides the heat stability, conductivity and electrochemisty, the strong hydrogen bond exists between CMC and silicon. Hydrogen bond has the self-recovery, and it can adjust the stress which continuously enlarge during the circle process of the material and so that it can maintain the stability of the material structure, and keep the capacity over 1000mAh/g during at least 100 times circulation, and the coulombic efficienty reaches 99.9%. CMC which is applied in silicon-based electrode will show the effect as follows:

*With the strong shear-thinning property, CMC can adjust the rheoloty of the slurry;

*Excellent circulation, primitive reversible capacity and better capacity retention;

*Effectively cushion the change of the volume swelling of the silicon-based electrode, and improve the electrode reversibility;

*With the double optimization to mechanics stability and the chemistry stability, CMC promotes to form the SEI film;

* CMC impacts on silicon granule, and reduces the damages for silicon-based electrode volume swelling;

*Effectively inhibit the side-reaction between high reactive Li-Si alloy and electrolyte;

*Use with other gel binders, and enhance the binding strength and activation properties.