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

作者：Wang, Weihua; Ding, Juan; Liu, Zhenjie; Wei, Yanbin; Cheng, Wenhua; Liu, Qingcui; Zhang, Weilu; Wang, XingChao; Zhang, Wenjun^*; Wang, Bao^*; Wang, Jiulin; Huang, Yudai^*

来源：Chemical Engineering Journal, 2023, 458: 141387.

DOI：10.1016/j.cej.2023.141387

• SiO
• Cobweb-like binder
• Self-healing
• TA-PAA
• Structural stability
• Long-term cycle performance

The choice of binder can prodigiously affect the electrochemical performance of the silicon-based anode. Un-fortunately, conventional binders with relatively weak intermolecular van der Waals forces have a weak buff-ering 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).

• 单位
  新疆大学; 中国科学院