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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
1
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 54000, China
2
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
3
CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China
4
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
5
Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning 530004, China
6
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; https://doi.org/10.3390/ma11112206
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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