摘要
低成本、高性能钠离子电池负极材料的开发是其走向商业化应用的关键。以富含芳香结构单元的煤液化固体残渣为碳源,结合KCl/CaCl2熔融盐的结构导向作用,可控制备了二维多孔碳纳米片(carbonnanosheets,CTx),并探究其用于钠离子电池负极材料的电化学性能。研究发现,通过调控碳化温度可对煤基多孔碳纳米片的微观结构进行优化,在1000℃下制备的二维碳纳米片样品(CT1000)具有相对高的比表面积和丰富的缺陷结构。作为钠离子电池的负极材料,在0.1 A·g^(−1)的电流密度下,其可逆比容量为221.4 mAh·g^(−1),当电流密度增加至10 A·g^(−1)时,比容量可以保持在124.4 mAh·g^(−1),倍率性能优异。此外,在1 A·g^(−1)的电流密度下经2000次循环后,比容量保持率高达94.2%,展现出较大的应用潜力。
The development of low-cost anodes with high charge-storage performance for sodium-ion batteries is the key to its commercialization.Herein,two-dimensional porous carbon nanosheets(CTx)were controllably prepared using coal liquefaction residue with rich aromatic frameworks as carbon precursors by taking advantage of KCl/CaCl_(2) molten salt,and their electrochemical performance as the anodes for sodium-ion batteries was further explored.It was found that the microstructure of coal-based CTx could be optimized by regulating the carbonization temperature,and the as-obtained sample at 1000℃(CT1000)exhibits a high specific surface area and abundant defect structure.Therefore,a high reversible specific capacity of 221.4 mAh·g^(−1) was achieved at a current density of 0.1 A·g^(−1) as the anodes for sodium-ion batteries,and the specific capacity could be maintained at 124.4 mAh·g^(−1) when the current density was increased to 10 A·g^(−1),demonstrating excellent rate performance.Furthermore,the CT1000 electrode delivers good cycling stability with a specific capacity retention of 94.2%after 2000 cycles at a current density of 1 A·g^(−1).
作者
任博阳
车晓刚
刘思宇
王满
韩兴华
董婷
杨卷
REN Boyang;CHE Xiaogang;LIU Siyu;WANG Man;HAN Xinghua;DONG Ting;YANG Juan(School of Chemical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;School of Chemical Engineering,North University of China,Taiyuan 030000,Shanxi,China)
出处
《化工学报》
EI
CSCD
北大核心
2022年第10期4745-4753,共9页
CIESC Journal
基金
国家自然科学基金项目(51802251)
国家重点研发计划项目(2018YFB0604604)。
关键词
钠离子电池
煤基固体残渣
熔融盐
多孔碳纳米片
电化学性能
sodium-ion batteries
coal-based residue
molten salt
porous carbon nanosheets
electrochemical performance
作者简介
通信作者:韩兴华(1981-),男,博士,讲师,hxh@nuc.edu.cn;通信作者:杨卷(1987-),男,博士,副教授,juanyang@xjtu.edu.cn;第一作者:任博阳(1996-),男,硕士研究生,1433783163@qq.com;第一作者:车晓刚(1996-),男,硕士研究生,13115063021@163.com。
