气候变化领域集成服务门户(CCPortal): A revised mechanistic model for sodium insertion in hard carbons

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DOI	10.1039/d0ee01363c
	A revised mechanistic model for sodium insertion in hard carbons
	Au H.; Alptekin H.; Jensen A.C.S.; Olsson E.; O'Keefe C.A.; Smith T.; Crespo-Ribadeneyra M.; Headen T.F.; Grey C.P.; Cai Q.; Drew A.J.; Titirici M.-M.
发表日期	2020
ISSN	17545692
起始页码	3469
结束页码	3479
卷号	13 期号:10
英文摘要	Hard carbons have shown considerable promise as anodes for emerging sodium-ion battery technologies. Current understanding of sodium-storage behaviour in hard carbons attributes capacity to filling of graphitic interlayers and pores, and adsorption at defects, although there is still considerable debate regarding the voltages at which these mechanisms occur. Here, ex situ23Na solid-state NMR and total scattering studies on a systematically tuned series of hard carbons revealed the formation of increasingly metallic sodium clusters in direct correlation to the growing pore size, occurring only in samples which exhibited a low voltage plateau. Combining experimental results with DFT calculations, we propose a revised mechanistic model in which sodium ions store first simultaneously and continuously at defects, within interlayers and on pore surfaces. Once these higher energy binding sites are filled, pore filling occurs during the plateau region, where the densely confined sodium takes on a greater degree of metallicity. © The Royal Society of Chemistry.
英文关键词	Binding sites; Defects; Metal ions; Nuclear magnetic resonance spectroscopy; Pore size; DFT calculation; Low-voltage plateau; Mechanistic modeling; Plateau region; Sodium clusters; Sodium insertions; Solid state NMR; Total scattering; Sodium-ion batteries
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189535
作者单位	Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom; School of Physics and Astronomy and Materials Research Institute, Queen Mary University of London, London, E1 4NS, United Kingdom; Department of Chemical and Process Engineering, University of Surrey, Guildford, GU2 7XH, United Kingdom; Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, United Kingdom; Isis Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory, Stfc, Didcot, OX11 0QX, United Kingdom
推荐引用方式 GB/T 7714	Au H.,Alptekin H.,Jensen A.C.S.,et al. A revised mechanistic model for sodium insertion in hard carbons[J],2020,13(10).
APA	Au H..,Alptekin H..,Jensen A.C.S..,Olsson E..,O'Keefe C.A..,...&Titirici M.-M..(2020).A revised mechanistic model for sodium insertion in hard carbons.Energy & Environmental Science,13(10).
MLA	Au H.,et al."A revised mechanistic model for sodium insertion in hard carbons".Energy & Environmental Science 13.10(2020).