Carbon and Li3BO3 Co-Modified SiOx as Anode for High-Performance Lithium-Ion Batteries

SiOx-based anode material has emerged as one of the most promising candidates for graphite. However, poor electronic conductivity and relatively large volume effect hinder its practical application as anode lithium-ion batteries (LIBs). Herein, a co-modification approach using carbon and lithium borate hybrid coating simultaneously, is introduced to rationally exploit and improve the electronic and ionic conductivity of SiOx. When applied as anodes for LIBs, the SiOx@C@Li3BO3 sample exhibits superior cycling performance (81% capacity retention after 500 cycles at 1 A g(-1)). The enhanced electrochemical performance can be ascribed to the synergetic contribution of carbon and Li3BO3, which effectively accommodates the large volume change and improves the interfacial stability of SiOx@C@Li3BO3 during the lithiation/delithiation process. Herein, a versatile design strategy for alloy-type anode materials is furnished.