High recyclability and power performance of a thin micro lithium-ion battery anode

Abstract

Abstract. We report a high recyclability and fast charging/discharging speed of a thin silicon/carbon anode, which can implement direct prototyping of three dimensional (3D) microbattery on chip. The silicon/carbon material uses SU-8 as carbon source, and forms Si/void/C structure to provide enough space for volume expansion of the SiNPs during lithium-ion intercalation. By using roll forming, the anode has been demonstrated to enjoy the superior recyclability (563.42 mAh/g in the third cycle, while 472.96 mAh/g after 500 cycles) and the high charging/discharging speed (1.35 hour to finish a whole charge/discharge cycle) with only 60μm thickness.