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Nano Research 2017, 10(12): 4448-4456 https://doi.org/10.1007/s12274-017-1753-6
Research Article | Issue | Published: 01 September 2017

Improved flexible Li-ion hybrid capacitors: Techniques for superior stability

Show Author's Information Shengyang Dong1,2,  Hongsen Li1,  Junjun Wang1,  Xiaogang Zhang1( ),  Xiulei Ji2( )
Jiangsu Key Laboratory of Materials and Technology for Energy Conversion College of Material Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016 China
Department of Chemistry Oregon State UniversityCorvallisOregon 97331-4003 USA
Keywords:
graphene, carbon nanotube, flexible devices, Li-ion hybrid capacitors, Li4Ti5O12 nanoplates
Cite this article:
Dong S, Li H, Wang J, et al. Improved flexible Li-ion hybrid capacitors: Techniques for superior stability. Nano Research, 2017, 10(12): 4448-4456. https://doi.org/10.1007/s12274-017-1753-6
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Abstract Full text Electronic supplementary material About this article

Flexible power devices play an increasingly crucial role in emerging flexible electronics. To improve the electrochemical performance of flexible power devices, novel electrode structures and new energy-storage systems should be designed. Herein, a novel flexible Li-ion hybrid capacitor (LIC) is designed based on an anode comprising Li4Ti5O12 nanoplate arrays coated on carbon textile (LTO/CT) and a cathode comprising a flexible N-doped graphene/carbon-nanotube composite (NGC) film. The LTO/CT anode is fabricated by directly growing Li4Ti5O12 nanoplates on CT with robust adhesion using a simple one-pot hydrothermal reaction. Considering the volume of a real-device flexible LIC, the NGC//LTO/CT configuration delivers high volumetric energy and power densities of 2 mWh·cm−3 and 185 mW·cm−3, respectively. Furthermore, the flexible LIC shows excellent flexibility and electrochemical stability, with extremely small capacity fluctuation under different bending states. This work demonstrates a scalable route to assemble flexible LICs as high-performance power devices.


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About this article

Improved flexible Li-ion hybrid capacitors: Techniques for superior stability

Show Author's information Shengyang Dong1,2, Hongsen Li1, Junjun Wang1, Xiaogang Zhang1( ), Xiulei Ji2( )
Jiangsu Key Laboratory of Materials and Technology for Energy Conversion College of Material Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016 China
Department of Chemistry Oregon State UniversityCorvallisOregon 97331-4003 USA

Abstract

Flexible power devices play an increasingly crucial role in emerging flexible electronics. To improve the electrochemical performance of flexible power devices, novel electrode structures and new energy-storage systems should be designed. Herein, a novel flexible Li-ion hybrid capacitor (LIC) is designed based on an anode comprising Li4Ti5O12 nanoplate arrays coated on carbon textile (LTO/CT) and a cathode comprising a flexible N-doped graphene/carbon-nanotube composite (NGC) film. The LTO/CT anode is fabricated by directly growing Li4Ti5O12 nanoplates on CT with robust adhesion using a simple one-pot hydrothermal reaction. Considering the volume of a real-device flexible LIC, the NGC//LTO/CT configuration delivers high volumetric energy and power densities of 2 mWh·cm−3 and 185 mW·cm−3, respectively. Furthermore, the flexible LIC shows excellent flexibility and electrochemical stability, with extremely small capacity fluctuation under different bending states. This work demonstrates a scalable route to assemble flexible LICs as high-performance power devices.

Keywords: graphene, carbon nanotube, flexible devices, Li-ion hybrid capacitors, Li4Ti5O12 nanoplates

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Publication history
Copyright
Acknowledgements

Publication history

Received: 26 April 2017
Revised: 15 June 2017
Accepted: 30 June 2017
Published: 01 September 2017
Issue date: December 2017

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany 2017

Acknowledgements

Acknowledgements

X. G. Z. acknowledges the supports by the National Basic Research Program of China (No. 2014CB239701), National Natural Science Foundation of China (Nos. 51372116, 51504139, and 51672128). X. L. J. thanks Oregon State University for the financial supports. S. Y. D. acknowledges the Funding for Outstanding Doctoral Dissertation in NUAA (No. BCXJ16-07), Funding of Jiangsu Innovation Program for Graduate Education (No. KYLX16_0341), the Priority Academic Program Development of Jiangsu Higher Education (PAPD), and the China Scholarship Council (CSC) for providing a scholarship for Ph.D. study at Oregon State University.

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