STUDY ON A NOVEL MICRO-SPHERICAL CARBON AEROGELS AS ANODE MATERIALS FOR LITHIUM ION BATTERIES

摘要

For the lithium ion battery, Si as anode materials has very high theory capacity (4200 mAh/g) compared to all other anode materials. However, Si exists a serious volume effect resulting the significant drop in the circulating stability of electrode [1-3]. How to limit the volume expanding of Si during the process of charge and discharge is the key problem for the future application of Si as anode materials. Since carbon materials have been used for the anode materials of lithium ion secondary battery because of high cyclic stability and can server as container to limit the volume expanding of metal In this work, a novel micro-spherical carbon aerogels containing nano-Si powder were synthesized by a series of processes such as sol-gelatin, supercritical drying and carbonization using resorcinol and formaldehyde with catalyst and surfactant. The micro-spherical carbon aerogels were characterized by SEM, BET and XRD. And electrochemical properties of the composites have been studied also.