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Open AccessArticle

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

by Zehua Chen 1,2,†, Liang Lu 1,3,†, Yu Gao 1, Qixiang Zhang 1, Chuanxiang Zhang 1,*, Chunwen Sun 3,4,5,* and Xingying Chen 6
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 54000, China
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning 530004, China
Medical College, Henan Polytechnic University, Jiaozuo 454000, China
Authors to whom correspondence should be addressed.
The authors equally contributed to this work.
Materials 2018, 11(11), 2206;
Received: 10 October 2018 / Revised: 2 November 2018 / Accepted: 5 November 2018 / Published: 7 November 2018
(This article belongs to the Special Issue Electrode Materials for High Performance Sodium-ion Batteries)
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. View Full-Text
Keywords: sodium-ion batteries; Na2Ti3O7; F-doping; electronic conductivity sodium-ion batteries; Na2Ti3O7; F-doping; electronic conductivity
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Chen, Z.; Lu, L.; Gao, Y.; Zhang, Q.; Zhang, C.; Sun, C.; Chen, X. Effects of F-Doping on the Electrochemical Performance of Na2Ti3O7 as an Anode for Sodium-Ion Batteries. Materials 2018, 11, 2206.

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