Nanoengineering of N-doped carbon-coated anatase TiO2 nanoparticles for high-performance sodium ion battery

Anatase TiO 2 has been widely reported using as anodes of sodium-ion battery (SIB) due to its eco-friendly, electrochemical stability and favorable capacity of sodium ions storage. Herein, a facile and efficient method based on pyrolysis process converting polydopamine-coated industrial metatitanic acid to N-doped carbon-coated anatase TiO 2 (TiO 2 @C) was introduced for sodium ion battery. The electrochemical measurements demonstrated that the TiO 2 @C sample delivered a reversible capacity of 270 mA h g −1 at a current of 0.1 A g −1 after 100 cycles in ether-based electrolyte. In particular, within ester-based electrolyte, an ultralong cycling life on the sample TiO 2 @C was obtained, 130 mA h g −1 at 1 A g −1 after 10,000 cycles. Furthermore, the Na-ion full-cell assembled TiO 2 @C with Na 3 V 2 (PO 4 ) 3 in ester-based electrolyte demonstrated an energy density as high as ca. 300 W h kg −1 .