A kind of silicon monoxide-based anode material coated with layers of lithium titanate and carbon was synthesized by chemical vapor deposition and sol-gel method.The electrochemical measurement shows that with lithium titanate coating at an amount of 3%,the anode material presents good performance,showing that the specific capacity is 1 485.4,1443.8,1386.4,1341 and 1276.2 mAh/g correspondingly at 0.2C,0.5C,1C,2C and 4C rate respectively,and the specific capacity is 1 138.1 mAh/g after 150 charge-discharge cycles at current density of 750 mA/g.The flexible carbon layer can buffer volume expansion of the internal silicon core and improve the conductivity of the material.The rigid lithium titanate can ensure structural integrity of the material.The synergy of two layers of coatings can effectively improve cycle stability,rate performance and reversible capacity of electrode material.
关键词
锂离子电池/氧化亚硅/负极材料/双壳层结构/钛酸锂/碳包覆/硅基材料
Key words
lithium-ion battery/silicon monoxide/anode material/double-shell structure/lithium titanate/carbon coating/silicon-based material
维普
万方数据