期刊
CARBON
卷 191, 期 -, 页码 10-18出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2022.01.034
关键词
Soft carbon; Molecular tuning; Sulfur doping; Potassium-ion batteries
资金
- National Natural Science Foundation of China [52071171]
- Liaoning Revitalization Talents Program-Pan Deng Scholars [XLYC1802005]
- Liaoning BaiQianWan Talents Program [LNBQW2018B0048]
- Natural Science Fund of Liaoning Province for Excellent Young Scholars [2019-YQ-04]
- Key Project of Scientific Research of the Education Department of Liaoning Province [LZD201902]
- Shenyang Science and Technology Project [21-108-9-04]
- Australian Research Council (ARC) [FT210100298, DP220100603]
- CSIRO Energy Centre and Kick-Start Project
- Victorian Government's through veski-Study Melbourne Research Partnerships (SMRP) project
- Doctoral Start-up Foundation of Liaoning Province, China [2020-BS-081]
- Foundation of State Key Laboratory of High-efficiency Utili-zation of Coal and Green Chemical Engineering [2021-K63]
Soft carbon nanosheets (SNC) derived from sulfur doped quinoline oligomer exhibit expanded interlayer spacing, modest defects, and relatively ordered carbon clusters. These features contribute to high potassium storage capacity, fast diffusion of electrons and ions, and superior electrochemical performance compared to other carbon anodes.
Soft carbon has been considered as one of the most promising high-performance potassium-ion battery anodes owing to the advantages of high carbon crystallinity and conductivity. Nevertheless, the lack of microstructure tunning strategy for soft carbon generally leads to low interlayer spacing and limited active sites, which results in relatively low storage capacity and sluggish kinetics. Herein, sulfur doped quinoline oligomer derived soft carbon nanosheets (SNC) have been successfully fabricated with expanded interlayer spacing, modest defects, and relatively ordered carbon clusters. These favorable characteristics can not only contribute to a high potassium storage capacity, but also shorten the diffusion spacing for both electrons and ions. Hence, SNC displays an extremely high capacity (456 mA h g(-1) at 0.05 A g(-1)) and long cyclability (189 mA h g(-1) at 2.0 A g(-1) after 1000 cycles), superior to most of recently reported carbon anodes. Kinetic analyses demonstrate that sulfur doped quinoline oligomer derived soft carbon can significantly boost the potassium diffusion. Additionally, the enlarged interlayer spacing and modest defect sites benefitted from high sulfur doping could further enhance potassium storage properties. This study provides a facile molecular tuning and large-scale production strategy for soft carbon anodes with high capacity and long life. (C) 2022 Elsevier Ltd. All rights reserved.
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