Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries

Silicon has gained considerable attention as an anode material in lithium-ion batteries due to its high theoretical capacity. However, the significant volume changes that occur during lithiation/delithiation processes often result poor cycling stability of silicon anodes. In this study, a hybrid ionically covalently cross-linked network binder carboxymethylcellulose-hyperbranched polyethyleneimine (CMC-HBPEI) is successfully constructed by “switching” ionic bonds and partially “converting” them covalent buffer variation network, responsible for maintaining structural integrity anode, while utilizes bonding reversibility sustainably dissipative mechanical stress self-heal breakages generated from lithiation expansion silicon. By changing drying temperature ratio can be adjusted balance CMC-HBPEI binder. Even after 300 cycles charging/discharging under current density 500 mAg−1, specific capacity optimized Si/CMC-HBPEI remains at 1545 mAhg−1.