Multilayer coated SiO2@NC@TiN carbon nanofibers as anode with exceptional cycling stability

Nanostructure engineering and carbon incorporation can effectively achieve superior lithium storage performance of SiO 2 anode. However, the working operation at high rates and extreme temperatures remains a challenge for SiO 2 -based anode. Here, SiO 2 @N-doped carbon (SiO 2 @NC) nanospheres encapsulated in the TiN/C nanofibers (SiO 2 @NC@TiN/C) were fabricated via coaxial electrospinning. The SiO 2 @NC@TiN/C with a robust structure and conductive shells exhibited excellent cycling stability and fast Li + diffusion kinetics. The SiO 2 @NC@TiN/C electrode delivered a superior rate performance (317.9 mAh g −1 ) and ultra-long cycle life (284.5 mAh g −1 after 3200 cycles) at 10 A g −1 . Furthermore, the SiO 2 @NC@TiN/C electrode maintained an excellent cycling stability at 65 ℃ (420.6 mAh g −1 after 300 cycles at 1 A g −1 ). This research offered an ingenious design way to create a multilayer coated anode, which could exhibit good electrochemical performance under harsh conditions.