A Strong Interfacial Adhesion and High Stress Dissipation Binder for Durable Microsized SiOx Anodes

Abstract

The rapid capacity decay of microsized SiO_x anode resulting from large volume change hinders its commercial application. Herein, a polymer binder with strong interfacial adhesion and high stress dissipation is designed to alleviate the volume change of microsized SiO_x anode and maintain structural integrity of electrode. The density functional theory calculations (DFT) and X-ray photoelectron spectroscopy (XPS) reveal that the multifunctional polymeric network enhances interfacial contact between the binder and silicon oxide (SiO_x) particles through gradient hydrogen bonds. Additionally, the designed binder exhibits high mechanical strength and self-healing function via the synergy of supramolecular and covalent chemistry. The designed binder enables SiO_x electrodes to exhibit notable cycling stability and superior rate performances. This work provides valuable insights into the structure-function relationship of binder for high-capacity SiO_x anodes.