Acta Phys. -Chim. Sin. ›› 2018, Vol. 34 ›› Issue (2): 219-226.doi: 10.3866/PKU.WHXB201707173

• ARTICLE • Previous Articles    

Engineering Oxygen-Deficient Na2Ti3O7 Nanobelt Arrays on Carbon Cloth as Advanced Flexible Anodes for Sodium-Ion Batteries

Xiyue ZHANG1,Yalan HUANG1,3,Shuwei WU2,Yinxiang ZENG1,Minghao YU1,Faliang CHENG3,Xihong LU1,2,*(),Yexiang TONG1,*()   

  1. 1 MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
    2 Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education), Nankai University, Tianjin 300071, P. R. China
    3 Guangdong Engineering and Technology Research Centre for Advanced Nanomaterials, Dongguan University of Technology, Dongguan 523808, Guangdong Province, P. R. China
  • Received:2017-06-06 Published:2017-11-13
  • Contact: Xihong LU,Yexiang TONG E-mail:luxh6@mail.sysu.edu.cn;chedhx@mail.sysu.edu.cn
  • Supported by:
    the National Key R & D Program of China(2016YFA0202604);National Natural Science Foundation of China(2143306);Guangdong Natural Science Funds for Distinguished Young Scholar, China(2014A0306048);Tip-top Scientic and Technical Innovative Youth Talents of Guangdong Special Support Program, China(2015TQ01C205);Technology Planning Project of Guangdong Province, China(2015B090927007);Pearl River Nova Program of Guangzhou, China(201610010080);Science and Technology Program of Guangzhou, China(201604010124);Open Fund of Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, China(MTEC-2015M05)

Abstract:

Sodium ion batteries (SIBs), a promising substitute for lithium ion batteries (LIBs), have attracted extensive attention due to the abundance and low cost of sodium resources. In addition, flexible sodium-ion batteries may be able to satisfy the demands of large-scale energy storage applications for portable, wearable, and flexible electronics. Compared to the development of cathode materials, the progress on anode materials has been relatively slow. Therefore, the exploration of low-cost anode materials with high Na+ storage capacity is very important. Herein, we present oxygen-deficient Na2Ti3O7 nanobelts grown on carbon cloth (CC) as a promising novel flexible anode material for SIBs. Free-standing Na2Ti3O7 nanobelts with oxygen vacancies were directly grown on CC through a simple hydrothermal and thermal reduction process. Benefiting from the improved conductivity and increased active sites after the introduction of oxygen vacancies, the new material exhibits a high reversible capacity of 100 mAh·cm-2 at 200 mA·cm-2, with almost 80% capacitance retention after 200 cycles. When the current density was increased to 400 mA·cm-2, a high capacity of 69.7 mAh·cm-2 was achieved, which is three times that of bare Na2Ti3O7 nanobelts on CC. This 3D oxygen-deficient electrode can significantly promote the transport of Na+ ions and electrons, leading to remarkably improved electrochemical properties. Furthermore, this work constitutes a promising strategy to rationally design and fabricate novel Na2Ti3O7-based anodes with enhanced capacitive behavior, which hold great promise for energy storage/conversion devices, facilitating the large-scale implementation of high-performance flexible SIBs.

Key words: Oxygen-deficient, Na2Ti3O7, Flexible, Anode, Sodium ion battery

MSC2000: 

  • O646