Boosting\nSodium Storage of Hierarchical Nanofibers\nwith Porous Carbon-Supported Anatase TiO₂/TiO₂(B) Nanowires

Abstract

Structural\nand phase regulation of TiO₂ anode materials\nhas been confirmed to significantly promote sodium storage for sodium-ion\nbatteries (SIBs). Herein, TiO₂/C hierarchical nanofibers\nwith anatase/TiO₂(B) mixed phases are synthesized by a\ndual-template method, which employs an amphiphilic triblock copolymer\n(F127) and SiO₂ as templates. The hierarchical structure\nof TiO₂/C nanofibers provides effective contact for both\nthe anode and electrolyte, and the anatase/TiO₂(B) mixed\nphase causes rapid sodium-ion transmission. Moreover, the TiO₂/C anode delivers a high reversible discharge capacity (262\nmAh g^–1, 0.1 A g^–1), remarkable\nrate 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\na dependable approach to build hierarchical TiO₂ anode\nmaterials for SIBs with superior performance.