物理化学学报 >> 2018, Vol. 34 >> Issue (2): 219-226.doi: 10.3866/PKU.WHXB201707173

论文 上一篇    

碳布负载的缺氧型Na2Ti3O7纳米带阵列作为高性能柔性钠离子电池负极材料

张熙悦1,黄雅兰1,3,吴树炜2,曾银香1,于明浩1,程发良3,卢锡洪1,2,*(),童叶翔1,*()   

  1. 1 中山大学化学学院,生物无机和合成化学重点实验室,广州510275
    2 南开大学,高级能源材料化学(教育部)重点实验室,天津300071
    3 东莞理工学院,广东省先进纳米材料技术研究中心,广东东莞523808
  • 收稿日期:2017-06-06 发布日期:2017-11-13
  • 通讯作者: 卢锡洪,童叶翔 E-mail:luxh6@mail.sysu.edu.cn;chedhx@mail.sysu.edu.cn
  • 基金资助:
    国家重点研发计划(2016YFA0202604);国家自然科学基金(2143306);广东省杰出青年科学基金(2014A0306048);广东省特支计划科技创新青年拔尖人才项目(2015TQ01C205);广东省应用型科技研发专项资金项目(2015B090927007);广州市珠江科技新星项目(201610010080);广州市科技计划项目(201604010124);江苏省能量转换材料与技术重点实验室开放基金(MTEC-2015M05)

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)

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摘要：

作为锂离子电池的理想替代品，钠离子电池因具有能源储备丰富、成本低廉等优点而受到人们的广泛关注。柔性便携式电子产品的发展亟需柔性储能器件的研制。因此，发展一种廉价、高性能的柔性钠离子电池负极材料成了科研工作者的共同目标。在此项工作中，我们通过简单的水热合成和热还原法发展了一种以柔性碳布为基底，与缺氧型的Na2Ti3O7纳米带(NTO)构成三维阵列结构的新型柔性钠离子电池负极材料。复合材料(R-NTO/CC)的导电性和活性位点得到提高，电化学性能也大幅提升，在200 mA·cm-2的电流密度下，实现100 mAh·cm-2的面积比容量，且经过200次循环后仍保留最初电容值的80%。此外，这种电极还具有优良的倍率性能，当电流密度提高到400 mA·cm-2时，仍保持69.7 mAh·cm-2的面积比容量，是未引入氧空位材料的三倍之多。这种三维缺氧的电极材料可有效提高载流子浓度，缩短离子传输通道，从而大幅提升电极的电化学性能。此工作为设计合成高储钠性能的新型的负极材料提供了一种实用有效的策略。

关键词: 缺氧型, Na2Ti3O7, 柔性, 负极材料, 钠离子电池

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