期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133444
关键词
K+-based dual-ion batteries; In-situ nitrogen doping; Three-dimensional carbon matrix; Electrochemical working mechanism
资金
- Key-Area Research and Development Program of Guangdong Province [2019B090914003]
- National Natural Science Foundation of China [51822210, 51972329, 52061160484]
- Shenzhen Science and Tech-nology Planning Project [JCYJ20200109115624923, JCYJ20190807171803813]
- Science and Technology Planning Project of Guangdong Province [2019TX05L389, 2018A050506066]
- Guang-dong Basic and Applied Basic Research Foundation [2019B1515120005]
- China Postdoctoral Science Foundation [2020M672885]
In this study, a simple strategy is proposed to encapsulate ultrasmall Sb nanodots into N-doped carbon nanowires, resulting in high-performance anodes for PDIBs. The combination of this anode with expanded graphite cathode forms a novel PDIB with superior performance in terms of capacity and cycling stability.
Recently, potassium dual-ion batteries (PDIBs) have attracted considerable attention owing to the advantages of low cost, environmental friendliness, and high working voltage. However, the lack of suitable anode materials to adapt the slow diffusion of K(+ )ions leads to the low capacity and poor cycling stability of PDIBs, which seriously impedes their further development. Herein, a simple strategy is proposed to in-situ encapsulate ultrasmall Sb nanodots into N-doped carbon nanowires (Sb@NCNWs) with a three-dimensional (3D) porous structure, yielding high-performance anodes for PDIBs. The nitrogen doping and 3D porous structure can facilitate the transport of electrons and K+ ions, while the carbon matrix can effectively buffer the volumetric change of Sb nanodots during the charge/discharge process. Combining this Sb@NCNWs anode with expanded graphite cathode, we construct a novel PDIB with the alloying and intercalation mechanism in the anode and cathode, respectively. The PDIB displays a high capacity of 218 mAh g(-1) at 0.2 A g(-1) (based on anodes) and capacity retention of 92.5% after 400 cycles at 0.4 A g(-1), which is the best performance among the previously reported PDIBs.
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