期刊
NANO ENERGY
卷 53, 期 -, 页码 415-424出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.08.075
关键词
Sulphur-doped reduced graphene oxide sponge; K-ion batteries; Free-standing anode; Reaction process
类别
资金
- National Natural Science Foundation of China [51702056, 51772135, 51702371]
- Natural Science Foundation of Guangdong Province, China [2014A030306010]
- Ministry of Education of China [6141A02022516]
- China Postdoctoral Science Foundation [2017M622902]
Due to the large radius of K-ion, K-ion batteries (KIBs) involving K-ion insertion and extraction processes generally exhibit an insufficient cycle life and poor rate performance. In this work, sulphur-doped reduced graphene oxide (S-RGO) sponges, which are used as free-standing anodes for KIBs, are obtained via simple freeze-drying of graphene oxide solution and subsequent thermal treatment in sulphur steam. After sulphur doping, our S-RGO sponges deliver preeminent electrochemical performance. Such free-standing electrodes exhibit high K-ion storage capacity of 361 mAh g(-1) at 50 mA g(-1) over 50 cycles. Furthermore, even at a high current density of 1 A g(-1), they also display a highly stabile K-ion storage with a capacity of 229 mAh g(-1) over 500 cycles, which outperforms all previously reported carbon-based materials for KIBs. Such preeminent performance is attributed to the S-RGO sponges' unique conductive structure and the sulphur doping, which effectively enhance the insertion of large K ions. We also utilize ex-situ XPS to illuminate the reaction process of our sample during potassiation/depotassiation and highlight the role of sulphur doping in improving K-ion storage performance.
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