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NaCl-templated synthesis of hierarchical porous carbon with extremely large specific surface area and improved graphitization degree for high energy density lithium ion capacitors

Abstract

Li ion capacitors (LICs) are emerging as a promising device to integrate the high power density of supercapacitors with the high energy density of Li ion batteries. However, the insufficient specific capacity of conventional capacitive electrode presents a great challenge in achieving high energy density of LICs. Herein, we demonstrate the synthesis of hierarchical porous carbon with extremely large specific surface area of 3898 m2 g-1 and improved graphitization degree by using egg white biomass as precursor and NaCl as template, in which dual functional NaCl is severed as both macropore creating template and graphitic catalyst to enhance the graphitization degree. With rational design, the developed porous carbon exhibits noticeably enhanced specific capacity of 118.8 mAh g-1 at 0.1 A g-1 with excellent rate capability and improved cycle stability over 4000 cycles in organic Li ion conducting electrolyte. Furthermore, the obtained porous carbon was employed as cathode pairing with Fe3O4@C anode for LIC application, which delivers integrated high energy density (124.7 Wh kg-1) and power density (16,984 W kg-1) as well as a superior capacity retention of 88.3% after 2000 cycles at 5 A g-1, demonstrating the promising application as potential electrode candidates for efficient energy storage systems.

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Publication details

The article was received on 19 Jun 2018, accepted on 02 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA05853A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    NaCl-templated synthesis of hierarchical porous carbon with extremely large specific surface area and improved graphitization degree for high energy density lithium ion capacitors

    B. Li, R. Shi, C. Han, H. Li, L. Xu, T. Zhang, J.Q. Li, Z. Lin, C. P. Wong and F. Kang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05853A

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