三维多孔碳负载氧化锡并协同氟化锂制备高性能锂离子阳极  

Three-Dimensional Porous Carbon Loading Tin Oxide and Cooperating with Lithium Fluoride to Prepare High Performance Lithium Ion Anode

作　　者：何强 孙晓刚[1] 邹婧怡 李锐 HE Qiang;SUN Xiao-Gang;ZOU Jing-Yi;LI Rui(School of Mechanical and Electrical Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学机电工程学院,南昌330031

出　　处：《无机化学学报》2021年第3期473-481,共9页Chinese Journal of Inorganic Chemistry

基　　金：江西省科技厅科研项目(No.20142BBE50071);江西省教育厅(No.KJLD13006)资助。

摘　　要：新型多孔碳纳米片/碳纳米管(PC/CNT)材料表现出丰富的分级孔隙结构,具有较高的氧化锡(SnO_(2))负载量。通过PC和CNT交联形成的三维结构能够有效地提高锂离子传输速率和电子的传导。此外,在电极中掺杂的氟化锂(LiF)不仅能够降低SnO_(2)-PC/CNT-LiF电极的电荷转移电阻,而且还能补充SEI膜形成时消耗的Li+,降低不可逆容量,增强SEI膜的稳定性。研究表明,SnO_(2)-PC/CNT-LiF电极在电流密度为100 mA·g^(-1)时,首次可逆比容量达到1642.98 mAh·g^(-1),活性物质的利用率高达90.12%,循环100次后,放电比容量仍然达到745.11 mAh·g^(-1),且库仑效率仍然保持在95.1%以上,显示出优异的倍率和循环性能。New porous carbon nanosheets/carbon nanotubes(PC/CNT)materials showed a rich hierarchical pore structure with high tin oxide(SnO_(2))loading.The three-dimensional structure formed by the cross-linking of PC and CNT can improve Li+transmission rate and electron conduction.In addition,lithium fluoride(LiF)doped in the electrode can not only reduce the charge transfer resistance of the Sn O2-PC/CNT-LiF electrode,but also supplement the Li+consumed during the formation of the SEI film,reduce the irreversible capacity and enhance the stability of the SEI film.The first reversible specific capacity of SnO_(2)-PC/CNT-LiF electrode reached 1642.98 m Ah·g^(-1)at current density of 100 mA·g^(-1),and the utilization rate of active material was as high as 90.12%.After 100 cycles,the specific discharge capacity still reached above 745.11 mAh·g^(-1),and the coulombic efficiency remained above 95.1%,showing excellent rate and cycle performance.

关 键 词：氧化锡 多孔碳纳米片 碳纳米管 氟化锂 

分 类 号：TM912.9[电气工程—电力电子与电力传动] O646.21[理学—物理化学]