Electrospun TiO<sub>2</sub>/V<sub>3</sub>S<sub>4</sub>/Carbon Nanotube Composite Nanofibers as Anodes for Lithium-Ion Batteries with Enhanced Cycling Performance
Xuefang Xie, Qucheng Lin, Longfei Deng, Wenwen Song, Linyu Yang, Guozhao Fang, Anqiang Pan
Abstract
Vanadium sulfide is considered one of the candidates for negative electrode materials in lithium-ion batteries (LIBs). Due to its unique layered structure and high theoretical capacity, it has received great attention from researchers. However, the cyclic life and rate performance caused by large volume changes are not ideal, which hinders its commercial application. Here, electrospun TiO 2 /V 3 S 4 /carbon nanotube (CNT) composite nanofibers were synthesized as anodes and showed excellent lithium storage properties. Adding carbon nanotubes can improve the overall conductivity and mechanical properties of the electrode materials. The carbon matrix doped with N and S provides more defects and active sites, which can further improve the conductivity and lithium storage capacity of the material. At a current density of 0.1 A g –1, the specific capacity of TiO 2 /V 3 S 4 /CNT was still 718.1 mA h g –1 after 100 cycles, and the capacity retention rate was 92.96% after removing the irreversible reaction of the first cycle. Long cycle testing was conducted at a current density of 1 A g –1, and after 700 cycles, there was still 712.2 mA h g –1 .