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Research Article

Chemical cross-linking and mechanically reinforced carbon network constructed by graphene boosts potassium ion storage

Chenxu Wang1,§, Ruohan Yu2,3,§, Wen Luo1,2( ), Wencong Feng2, Yuanhao Shen2, Nuo Xu1, Liqiang Mai2
Department of Physics, School of Science, Wuhan University of Technology, Wuhan 430070, China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, China
Nanostructure Research Centre (NRC), Wuhan University of Technology, Wuhan 430070, China

§ Chenxu Wang and Ruohan Yu contributed equally to this work.

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Graphical Abstract

A new synthetic strategy by sol–gel with acid etching for chemical cross-linking of graphene sheets was proposed. The obtained carbon network constructed by graphene (CNCG) exhibits remarkable electrical conductivity and mechanical enhancement as high-performance potassium ion battery anode.

Abstract

Carbon-based electrodes of potassium-ion batteries are of great research interest ascribed to their low cost and environmentally friendly distinctions. However, traditional carbon materials usually exhibit weak mechanical properties and incomplete crosslinking, resulting in poor stability and electrochemical performance. Herein, we report a new strategy for modifying reduced graphene oxide into a uniform few-layer structure through a sol–gel method combined with acid etching treatment. The obtained chemical cross-linking and mechanically reinforced carbon network constructed by graphene (CNCG) demonstrates excellent electrochemical and mechanical properties. Adopted as a free-standing anode (~ 7 mg·cm−2) for potassium ion battery, the as-achieved CNCG delivers a high reversible specific capacity of 317.7 mAh·g−1 at a current density of 50 mA·g−1 and admirable cycle stability (208.4 mAh·g−1 at 50 mA·g−1 after 500 cycles). The highly reversible structural stability and fully cross-linked properties during potassiation are revealed by ex-situ characterization. This work provides new ideas for the synthesis of new carbon materials and the development of high-performance electrodes.

Keywords

potassium-ion batterygraphene electrodechemical cross-linkingmechanical propertystorage mechanism

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Nano Research
Volume 15 Issue 10,
October 2022
Pages 9019-9025
DOI: 10.1007/s12274-022-4586-x
Cite this article:
Wang C, Yu R, Luo W, et al. Chemical cross-linking and mechanically reinforced carbon network constructed by graphene boosts potassium ion storage. Nano Research, 2022, 15(10): 9019-9025. https://doi.org/10.1007/s12274-022-4586-x
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Received: 22 March 2022
Revised: 18 May 2022
Accepted: 26 May 2022
Published: 08 July 2022
© Tsinghua University Press 2022
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