Effects of F-Doping on the Electrochemical Performance of Na₂Ti₃O₇ as an Anode for Sodium-Ion Batteries

• Main Authors: Zehua Chen, Liang Lu, Yu Gao, Qixiang Zhang, Chuanxiang Zhang, Chunwen Sun, Xingying Chen
• Format: Article
• Language: English
• Published: MDPI AG 2018-11-01
• Series: Materials
• Subjects: sodium-ion batteries; Na₂Ti₃O₇; F-doping; electronic conductivity
• Online Access: https://www.mdpi.com/1996-1944/11/11/2206
• ISSN: 1996-1944

The effects of fluorine (F) doping on the phase, crystal structure, and electrochemical performance of Na₂Ti₃O₇ are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements. F-doping does not change the crystal structure of NTO, although it has an effect on the morphology of the resultant product. As an anode material for sodium-ion batteries, the specific capacity of Na₂Ti₃O₇ exhibits a 30% increase with F-doping owing to the improved sodium ion diffusion coefficient. F-doped Na₂Ti₃O₇ also displays an enhanced rate capability and favourable cycling performance for more than 800 cycles.