Chemical Vapor Deposition Method Of Synthesis Of Lithium Ion Battery Silicon Carbon Composite Anode Materials Research

As application of lithium-ion battery expand to power battery and energy storage batteries, high energy density and cycle life of batteries are required. Performance is depended on the electrode materials. Therefore, researches focus on the development of new electrode materials. Graphite, as the commercialization of lithium-ion battery anode material, has limited application because of its limited theoretical capacity. To develop higher capacity anode materials is the most important research for the lithium ion battery.So far, Silicon has the largest theoretical specific capacity. However, the volume expansion during the charge and discharge process cause capacity fading, greatly limiting its application in lithium-ion batteries. Many methods have been used to improve silicon anode properties, one of the effective way is to disperse silicon into the carbon matrix. Therefore, preparing silicon/carbon composite materials can effectively improve the capacity and cycle performance.We synthesized Si/C composite using dimethyldichlorosilane and toluene as Si and C source on different carbon substrates via the Chemical Vapor Deposition process. The electrical performances of the obtained composites are analyzed. It is concluded that carbon matrix can effectively improve the conductivity. Silicon and carbon matrix were tightly connected by amorphous carbon network so that the volume expansion of silicon during the cycling was effectively released to realize structure stable.