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DOI	10.1039/c8ee02836b
	Extremely stable antimony-carbon composite anodes for potassium-ion batteries
	Zheng J.; Yang Y.; Fan X.; Ji G.; Ji X.; Wang H.; Hou S.; Zachariah M.R.; Wang C.
发表日期	2019
ISSN	1754-5692
起始页码	615
结束页码	623
卷号	12 期号:2
英文摘要	Potassium-ion batteries (PIBs) have been considered as promising alternatives to lithium-ion batteries due to potassium's high natural abundance of 2.09 wt% (vs. 0.0017 wt% for Li) and K/K + having a low redox potential of-2.93 V (vs.-2.71 V for Na/Na + ). However, PIB electrodes still suffer huge challenges due to the large K-ion radius and slow reaction dynamics. Herein, we report a high-capacity Sb@CSN composite anode with Sb nanoparticles uniformly encapsulated by a carbon sphere network (CSN) for PIBs. First-principles computations and electrochemical characterization confirm a reversible sequential phase transformation of KSb 2 , KSb, K 5 Sb 4 , and K 3 Sb during the potassiation/depotassiation process. In a concentrated 4 M KTFSI/EC + DEC electrolyte, the Sb@CSN anode delivers a high reversible capacity of 551 mA h g -1 at 100 mA g -1 after 100 cycles with an extremely slow capacity decay of only 0.06% per cycle from the 10th to 100th cycle; when at a high current density of 200 mA g -1 , the Sb@CSN anode still maintains a capacity of 504 mA h g -1 after 220 cycles. The Sb@CSN anodes demonstrate one of the best electrochemical performances for all K-ion battery anodes reported to date. The exceptional performance of Sb@CSN should be attributed to the efficient encapsulation of small Sb nanoparticles in the conductive carbon network as well as the formation of a robust KF-rich SEI layer on the Sb@CSN anode in the concentrated 4 M KTFSI/EC + DEC electrolyte. © 2019 The Royal Society of Chemistry.
语种	英语
scopus关键词	Antimony; Carbon carbon composites; Electrolytes; Ions; Lithium-ion batteries; Nanometals; Nanoparticles; Potassium; Redox reactions; Sodium compounds; Carbon composites; Conductive carbon; Electrochemical characterizations; Electrochemical performance; High current densities; High reversible capacities; Natural abundance; Reaction dynamics; Anodes; antimony; carbon; composite; concentration (composition); electrochemical method; electrode; electrolyte; equipment; ion; nanoparticle; performance assessment; potassium; redox potential; transformation
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162950
作者单位	Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, United States; College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China; Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, United States
推荐引用方式 GB/T 7714	Zheng J.,Yang Y.,Fan X.,et al. Extremely stable antimony-carbon composite anodes for potassium-ion batteries[J],2019,12(2).
APA	Zheng J..,Yang Y..,Fan X..,Ji G..,Ji X..,...&Wang C..(2019).Extremely stable antimony-carbon composite anodes for potassium-ion batteries.Energy and Environmental Science,12(2).
MLA	Zheng J.,et al."Extremely stable antimony-carbon composite anodes for potassium-ion batteries".Energy and Environmental Science 12.2(2019).