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High-performance flexible supercapacitors based on C/Na2Ti5O11 nanocomposite electrode materials

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Abstract

A new solution method to synthesize Na2Ti5O11 with titanium powder is presented, and the C/Na2Ti5O11 nanocomposite with high specific surface area and tunnel structure as the electrode material has excellent electrochemical performance. The single electrode composed of the C/Na2Ti5O11 nanocomposite based on carbon fiber fabric (CFF) has the highest area capacitance of 1066 mF cm−2 at a current density of 2 mA cm−2, which is superior to other titanates and Na-ion materials for supercapacitors (SCs). By scan-rate dependence cyclic voltammetry analysis, the capacity value shows both capacitive and faradaic intercalation processes, and the intercalation process contributed 81.7% of the total charge storage at the scan rate of 5 mV s−1. The flexible symmetric solid-state SCs (C/Na2Ti5O11/CFF//C/Na2Ti5O11/CFF) based on different C/Na2Ti5O11 mass were fabricated, and 7 mg SCs show the best supercapacitive characteristics with an area capacitance of 309 mF cm−2 and a specific capacitance of 441 F g−1, it has a maximum energy density of 22 Wh kg−1 and power density of 1286 W kg−1. As for practical application, three SCs in series can power 100 green light-emitting diodes (LEDs) to light up for 18 min, which is much longer than our previous work by Wang et al. lighting 100 LEDs for 8 min. Thus, the C/Na2Ti5O11 nanocomposite has promising potential application in energy storage devices.

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Acknowledgements

This work is supported by the NSFCQ (cstc2014jcyjA50030), the graduate scientific research and innovation foundation of Chongqing, China (Grant NO. CYS16016), NSFC (51572040, 51402112), the Development Program (“863” Program) of China (2015AA034801), the Fundamental Research Funds for the Central Universities (No. CDJZR12225501, CQDXWL-2014-001 and CQDXWL-2013-012), the large-scale equipment sharing fund of Chongqing University and the Chongqing University Postgraduates’ Innovation Project (No. CYS15016).

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Correspondence to Yi Xi.

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Zhang, C., Xi, Y., Wang, C. et al. High-performance flexible supercapacitors based on C/Na2Ti5O11 nanocomposite electrode materials. J Mater Sci 52, 13897–13908 (2017). https://doi.org/10.1007/s10853-017-1415-9

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