Three-Dimensional Rigidity-Reinforced SiO x Anodes with Stabilized Performance Using an Aqueous Multicomponent Binder Technology.

Three-dimensional (3D) rigidity-reinforced SiO _x anodes are prepared using the aqueous multicomponent binders to stabilize the performances of lithium-ion batteries. Considering an elastic skeleton, adhesiveness, electrolyte absorption, etc., four kinds of binders [polyacrylamide (PAM), poly(tetrafluoroethylene) (PTFE), carboxymethyl cellulose, and styrene butadiene rubber (SBR)] are selected to prepare aqueous multicomponent binders. The SiO _x anodes with the binder PAM/SBR/PTFE (PSP) exhibit a 3D rigidity-reinforced structure, larger adhesive force, and moderate electrolyte adsorption capacity compared to other anodes with single and multicomponent binders. Specifically, the electrochemical performances of the SiO _x anodes with the binder PSP663 are stabilized, and a retention capacity of 770 mAh g ^-1 at 500 mA g ^-1 after 300 cycles and a rate capacity of 993 mAh g ^-1 at 1200 mA g ^-1 are obtained. The enhanced performances are attributed to the good chemical stability of PTFE to protect SiO _x particles from the electrolyte corrosion and to ensure electrode integrity. SBR acts as the binder backbone due to the strong adhesion force and specific three-dimensional structure. The rigidity of PAM limits the excessive expansion of SiO _x particles well and shortens the ion migration. These results indicate that the 3D rigidity-reinforced SiO _x anode with the aqueous binder PSP663 has promising prospects for practical application, and the results also provide a reference for solving the expansion problem of the silicon materials.