Potato Starch-Based Graphite Spheres as Anode Material for Li-ion Batteries

摘要

Potato starch-based graphite spheres (PSGS) were prepared by a three-step process: impregnation followed by carbonization and further graphitization. The PSGS were characterized by X-ray diffraction, Raman techniques and Nitrogen adsorption isotherms. The results indicate that PSGS with high graphitization degree retains the original morphology of potato starch. The PSGS shows excellent electrochemical performance as anodic material in lithium ion batteries. The PSGS exhibits a reversible capacitance of 330mAh g~(-1) at a constant current density of 20mA g~(-1), and the initial coulombic efficiency reaches 88%. This could be ascribed to its good graphited structure and small specific surface area. Cyclic voltammertry test confirms the formation of the excellent solid electrolyte interface film.