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

Structural and phase regulation of TiO2 anode materials has been confirmed to significantly promote sodium storage for sodium-ion batteries (SIBs). Herein, TiO2/C hierarchical nanofibers with anatase/TiO2(B) mixed phases are synthesized by a dual-template method, which employs an amphiphilic triblock copolymer (F127) and SiO2 as templates. The hierarchical structure of TiO2/C nanofibers provides effective contact for both the anode and electrolyte, and the anatase/TiO2(B) mixed phase causes rapid sodium-ion transmission. Moreover, the TiO2/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 TiO2 anode materials for SIBs with superior performance.