Mutual Performance Enhancement within Dual N‐doped TiO2/Si/C Nanohybrid Lithium‐Ion Battery Anode.

Dual N‐doped TiO2/Si/C ternary nanohybrid has been successfully prepared via a facile solvothermal method. Polyethylene glycol (PEG) is applied to disperse TiO2 and silicon precursors. After polymerization with hexamethylene diisocyanate (HDI) and calcination, N‐doped TiO2 and carbon matrix are obtained. The contents of Si, TiO2 and C in N‐doped TiO2/Si/C are about 10 %, 72 % and 18 % respectively. N‐doped TiO2/Si/C shows an excellent electrochemical performance due to combined advantages of Si, TiO2 and C. The initial discharge/charge specific capacity of the N‐doped TiO2/Si/C is 658/548 mAh g−1 at a current of 0.1 A g−1 with a coulombic efficiency of 83 %. A reversible capacity of 538 mAh g−1 is achieved after 80 cycles. While at the high current of 5 A g1, the specific capacity of the N‐doped TiO2/Si/C can still reach 120 mAh g−1. Electrochemical impedance spectroscopy measurements prove the improved electric conductivity after N‐doping. [ABSTRACT FROM AUTHOR]