Silicon based negative active material has very high charge capacity and is widely applied to a high capacity battery. However, the silicon based negative active material may expand by about 300% to about 400% during charge and discharge.

Recently much attention has been devoted developing functional binders that can improve adhesion on silicon particle and accommodate substantial volume change during the charge/discharge process to maintain the electrode structure.

The binders for silicon electrodes hold stiff polymeric backbones as like carboxymethyl cellulose (CMC), poly(acrylic acid), and alginate show better electrochemical performance than commercial binders. Despite promising progress, the current research on polymer binders for silicon is still far from the practical application where high mass loading is necessary for the high areal capacity.

Here we report high performance silicon anodes using new water based binder including inorganic binder. This polymer matrix is compatible with lithium ion slurry manufacturing process, and can maintain both electric conductivity and mechanical integrity during the battery operation which results in good stability, rate capability, and cycle-life characteristics at high mass loading (>4.5 mg/cm²).