熔盐锌热法制备三维多孔碳用于高性能钾离子电池负极材料

Three-Dimensional Porous Carbon Prepared by Molten Salt Zinc-Thermal Method as Anode for High Performance Potassium Ion Batteries

采用熔盐锌热法,以蔗糖为前驱体成功制备了三维多孔碳材料,并将其用作钾离子电池负极材料。所制备的三维多孔碳具有大量相互贯通的孔道,有效地缓解了电极在充放电循环过程中的体积效应,提高了电解液对电极的浸润性,缩短了钾离子的扩散路径,从而展现出优异的循环稳定性和倍率性能。三维多孔碳电极在0.5 A·g-1的电流密度下,经过2500次循环后仍展现174.6 mAh·g-1的比容量,甚至在4.4 A·g-1的高倍率下容量仍保持在170 mAh·g-1。

Three-dimensional(3D)porous carbon materials are successfully prepared by molten salt zinc-thermal method using sucrose as precursor and used as anode materials for potassium ion batteries.The prepared 3D porous carbon has a large number of interconnected channels,which can effectively alleviate the volume effect of the electrode during the charge-discharge cycling process,improve the infiltration of electrolyte to the electrode,shorten the diffusion path of K+.Therefore,it shows excellent cycle stability and rate performance.3D porous carbon electrode delivers the specific capacity of 174.6 mAh·g^-1 after 2500 cycles at current density of 0.5 A·g^-1 and 170 mAh·g^-1 at a high rate of 4.4 A·g^-1.