Three types of carbon-coated silicon monoxide (SiO) materials were synthesized with different carbon sources and coating methods, and then their physicochemical properties and electrochemical performance were analyzed. A uniform and dense carbon film on the surface of material can be obtained by using a gaseous carbon source for vapor-phase coating. While a solid carbon source for liquid-phase coating leads to an uneven and loose film on the surface. With a combination of these two coating methods, the obtained carbon film on the surface can exhibit characteristics of two methods, including inner porous layer and outer dense layer. Electrochemical testing shows that with the combined coating method, the synthesized carbon-coated material delivers a specific capacity of 1 688.45 mAh/g, presenting the first charge-discharge efficiency of 76.13% and the capacity retention rate of 79.6% after 100 charge-discharge cycles.

SiO-based battery material  /  anode material  /  silicon monoxide  /  carbon coating  /  vapor-phase coating  /  liquid-phase coating  /  carbon coating structure  /  surface coating