| 초록 |
Silicon (Si) is a good material for lithium-ion battery anodes because of its high theoretical capacity, 4200mAh/g, more than 10 times higher than traditional carbon anode. However, the large volume changes of silicon particles during lithiation/delithiation cycles lead to rapid fading of capacity. In this study, a electrospinning technique was applied to overcome this limitation of Si based anodes. The core solution was prepared by blending polyvinylpyrrolidone (PVP) with silicon particles and graphene. In this solution, the individual silicon particles were inserted into graphene layers by supersonic mixing to improve its electronic conductivity, mechanical flexibility. Polyacryonitril (PAN) was used as the shell solution. After carbonization, a silicon-graphene/carbon core/shell fibers (SiGrCFs) were obtained and silicon particles are encapsulated by carbon shell. The core/shell structure of the SiGrCFs were confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and water contact angle (WCA). The electrochemical performances of SiGrCFs anode was evaluated |
