Boosting Sodium Storage of Hierarchical Nanofibers with Porous Carbon-Supported Anatase TiO2/TiO2(B) Nanowires

Structural and phase regulation of TiO 2 anode materials has been confirmed to significantly promote sodium storage for sodium-ion batteries (SIBs). Herein, TiO 2 /C hierarchical nanofibers with anatase/TiO 2 (B) mixed phases are synthesized by a dual-template method, which employs an amphiphilic triblock copolymer (F127) and SiO 2 as templates. The hierarchical structure of TiO 2 /C nanofibers provides effective contact for both the anode and electrolyte, and the anatase/TiO 2 (B) mixed phase causes rapid sodium-ion transmission. Moreover, the TiO 2 /C anode delivers a high reversible discharge capacity (262 mAh g –1, 0.1 A g –1 ), remarkable rate capacity (97 mAh g –1, 2.0 A g –1 ), and stable sodium storage performance (∼109 mAh g –1 over 1000 cycles, 1.0 A g –1 ). This work provides a dependable approach to build hierarchical TiO 2 anode materials for SIBs with superior performance.