Abstract
The narrow operating potential range is the main obstacle to limit the increase of energy density of supercapacitors. Surface functionalization of carbon-based electrode materials can effectively improve their electrochemical properties. In this work, a series of ionic liquid (ILs)/graphene composite electrode materials were designed and prepared using covalent and non-covalent strategies. The effects of ionic liquid modification on extending the operating voltage window, restraining self-discharge and optimizing the cycle life of devices were comprehensively studied. As a result, the non-covalent modification method can effectively reduce the defect degree of the electrodes without influencing their porosity. Meanwhile, the wettability of ILs/graphene with ILs electrolytes is improved and the self-discharge effect of the electrodes is suppressed. The resulting supercapacitors exhibited excellent stability at 4.0 V for 10,000 cycles with energy densities reaching up to 65 Wh kg–1.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 52102053), the Fundamental Research Program of Shanxi Province (Grant No. 20210302124655), the Natural Science Foundation of Shanxi Province (Grant No. 20210302123041), the Key Laboratory Research Foundation of North University of China (Grant No. 2022C80303), the Shanxi Key Laboratory of Advanced Carbon Electrode Materials (Grant No. 202104010910019).
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All the authors contributed to the completion of this paper. The details are as follows: (1) JK’s contributions included investigation, experiment implementation, data processing and analysis, and paper writing. (2) JL’s contributions included research ideas and investigation, paper revision, and providing funding and platforms for research. (3) RZ’s contributions were to revise the article. (4) CZ’s contributions were to assist the first author in the testing of the electrochemical impedance.
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Kang, J., Zhang, C., Zhou, R. et al. The rational design of poly (inoic liquid) for 4.0 V graphene-based supercapacitors. J Mater Sci: Mater Electron 35, 165 (2024). https://doi.org/10.1007/s10854-023-11900-x
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DOI: https://doi.org/10.1007/s10854-023-11900-x