N-doped carbon coated TiO2 hollow spheres as ultralong-cycle-life Na-ion battery anodes. (November 2019)

• Record Type: Journal Article
• Authors: Liu, Beibei; Wang, Jin; Li, Junhua; Fan, Kaili; Zhao, Dan; Liu, Guiyu; Yang, Chunming; Tong, Haixia; Qian, Dong
• Is Part Of: Journal of physics and chemistry of solids. Volume 134(2019)
• Page Start: 214
• Page End: 224
• Publication Date: 2019-11
• Subjects: N-doped carbon coated TiO2 hollow spheres -- Synthesis -- Cycling stability -- Na-ion battery; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2019.06.021
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: We used a simple solvothermal–pyrolytic two-step route to synthesize N-doped carbon coated anatase TiO2 (TiO2 @NC) hollow spheres, where dopamine hydrochloride was simultaneously used as the sources of nitrogen and carbon. The unique hollow structure of the TiO2 @NC hollow spheres and the introduced N-doped carbon coating layer resulted in excellent structural stability, facile electrolyte access, high electronic conductivity, short charge-transportation paths, and rapid Na + reaction kinetics. When applied as Na-ion battery anodes, the TiO2 @NC hollow spheres exhibited excellent electrochemical performance, which afforded a high reversible capacity of 260.4 mAh g −1 at a rate of 0.25C after 300 cycles and was 108.2 mAh g −1 at 10C even after 10000 cycles, with excellent cycling stability (95.8% retention of the maximum capacity). This superhigh cycling stability is among the highest reported for TiO2 /C-based anode materials in Na-ion batteries. Graphical abstract: Image 1 Highlights: A facile route is developed for fabrication of N-doped carbon coated anatase TiO2 (TiO2 @NC) hollow spheres. TiO2 @NC hollow spheres have superior Na + -storage properties, especially superhigh cycling stability. The excellent Na + -storage performance of TiO2 @NC hollow spheres is due to their unique structure.