No abstract

SiOx-based anodes are attracting intensive attention with the increasing demand for high-energy-density lithium-ion batteries (LIBs). Since the theoretical capacity of SiOx is superior to that of graphite and its volume deformation is more stable than that of silicon, tremendous efforts are applied to design various SiOx-based anode materials. However, industrially utilizing SiOx-based anodes is still insufficient owing to volume deformation, low initial coulombic efficiency and poor cycle life. Thus, this work develops a pitch-coated SiOx/graphite (P@SiOx@G) composite constructed with the optimal ratio between SiOx and graphite under the collaborative auxiliary of pitch coating to serve as a buffer against volume deformation and to improve the discharge rate performance.

This study demonstrates the increased integrity of graphite–SiOx–C hierarchical structure using 3-aminopropyltrimethoxysilane (APS). Furthermore, the carbon coating contributes to elec-trode stability.