化工进展2024，Vol.43Issue(z1)：443-456,14.DOI:10.16085/j.issn.1000-6613.2024-0435
氧硫双掺杂CNTs水系导电剂辅助构筑高性能石墨/SiO负极
O,S co-doped carbon nanotube aqueous conductive additive assisted construction of high-performance graphite/SiO anode
摘要
Abstract
Due to graphite's advantages such as abundant resources,high specific capacity and low lithium intercalation voltage,it is considered an important commercial anode for lithium-ion batteries(LIBs).However,the lower theoretical specific capacity of graphite limits further improvement in the energy density of LIBs.Therefore,in this study,a graphite/SiO composite anode was obtained by adding a small amount of silicon oxide(SiO)to graphite,which was then dispersed into a small amount of O,S co-doped double-walled carbon nanotube(O,S-DCNTs)aqueous conductive additive.The O,S-DCNTs were prepared by pre-oxidizing double-walled carbon nanotubes(DCNTs)in air and then mixing and calcining them with MgSO4,possessing abundant nanoscale pore structures,high sulfur content and strong hydrophilicity.Battery performance tests revealed that the introduction of O,S-DCNTs significantly improved the specific capacity,rate capability and cycling stability of the graphite/SiO composite anodes.Additionally,its cycling stability was four times that of graphite/SiO anodes containing pure sulfur-doped carbon nanotubes(S-DCNTs).This improvement was mainly attributed to the highly dispersed O,S-DCNTs,which can construct numerous conductive networks,provide abundant Li+storage space and active sites,and address the issues of poor conductivity and large volume expansion coefficient of SiO,thereby significantly enhancing the electrochemical performance of the graphite anode.This work provided new insights and directions for the preparation and energy storage applications of high-performance anode materials.关键词
双壁碳纳米管/氧化亚硅/石墨负极/水系导电剂/储能/纳米材料/复合材料/电化学Key words
double-walled carbon nanotubes/silicon monoxide/graphite anode/aqueous conductive additive/energy storage/nanomaterials/composites/electrochemistry分类
化学化工引用本文复制引用
马桂璇,徐子桐,肖志华,宁国庆,魏强,徐春明..氧硫双掺杂CNTs水系导电剂辅助构筑高性能石墨/SiO负极[J].化工进展,2024,43(z1):443-456,14.基金项目
中国石油大学(北京)校青年拔尖人才科研启动基金(ZX20230047) （北京）
国家自然科学基金(21706283). （21706283）
