O,S co-doped carbon nanotube aqueous conductive additive assisted construction of high-performance graphite/SiO anode
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.
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