Si@porous carbon fiber fabricated via wet spinning as a high-performance anode material for lithium-ion battery

Si/C composites are considered as attractive anode candidates for high-energy-density lithium-ion batteries and have been extensively researched. The carbon fiber (CF) fabricated by wet spinning is a well-established technology. However, there are scarce reports on Si/CF anodes fabricated by wet spinning. In this study, Si@porous carbon fiber (Si@PCF) composite were synthesized via wet spinning and subsequent thermal treatment. The porous carbon (PC) can effectively buffer the huge volume changes of Si nanoparticles during the charge-discharge process, promote the diffusion and transport of lithium ions , and compensate for the poor electronic conductivity of Si. The Si@PCF composite maintained a high capacity of 1178 mA h g −1  at 0.5 A g −1 after 100 cycles, suggesting potential for commercial application of the Si/PCF anode due to the excellent electrochemical performance and preparation technology suitable for large-scale production.