Novel-designed cobweb-like binder by “four-in-one” strategy for high performance SiO anode

The choice of binder can prodigiously affect the electrochemical performance of the silicon-based anode. Unfortunately, conventional binders with relatively weak intermolecular van der Waals forces have a weak buffering effect on the volume expansion of silicon-based anodes, which leads to electrode contact failure and substantial capacity decay during cycling. Herein, inspired by the spider web, a multifunctional cobweb-like complex binder (TA-PAA) with strong adhesion constructed of tapioca (TA) and polyacrylic acid (PAA) is designed and applied as a high efficiency binder for high capacity and long-term cycle performance SiO anode. Originating from high viscoelasticity, robust tensile, as well as mechanical strength and self-healing property (“four-in-one” effect), TA-PAA/SiO electrode accommodates volumetric stress and addresses electrode contact failure. The electrode delivers a brilliant rate performance (619.2 mA h g−1 at 5 A g−1) and long-term cycle performance (901.2 mA h g−1 over 1200 cycles at 2 A g−1).