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DOI	10.1039/d0ee02803g
	Na2Fe2F7: A fluoride-based cathode for high power and long life Na-ion batteries
	Park H.; Lee Y.; Cho M.-K.; Kang J.; Ko W.; Jung Y.H.; Jeon T.-Y.; Hong J.; Kim H.; Myung S.-T.; Kim J.
发表日期	2021
ISSN	17545692
起始页码	1469
结束页码	1479
卷号	14 期号:3
英文摘要	Despite the high energy density of layered-type cathode materials for Na-ion batteries, their two-dimensional crystal structure suffers a large volume change and phase transition during Na+ de/intercalation, which often results in their poor cycling performances. Thus, a robust three-dimensional framework with minimal structural change is required for stable electrochemical sodium storage. Here, we introduce an earth-abundant element-based trigonal-type Na-Fe-F compound (Na2Fe2F7) with three-dimensionally interconnected FeF6 octahedra and three-dimensional Na+ diffusion pathways. Through combined studies using first-principles calculations and experiments, we confirm that Na2Fe2F7 delivers excellent power-capability due to large three-dimensional Na+ diffusion pathways as well as ultra-long cycling performance due to negligible structural change during Na+ de/intercalation. These results will guide new insights for material discovery for high performance rechargeable batteries. © 2021 The Royal Society of Chemistry.
英文关键词	Calculations; Cathodes; Crystal structure; Iron compounds; Phase change materials; Sodium compounds; Sodium-ion batteries; Cycling performance; Diffusion pathways; First-principles calculation; High energy densities; Na-ion batteries; Power capability; Three-dimensional frameworks; Two-dimensional crystals; Fluorine compounds; electrode; fluoride; iron; sodium
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/190738
作者单位	Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, 05006, South Korea; Department of Energy Science, Sungkyunkwan University, Suwon, 16419, South Korea; Advanced Analysis Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea; Beamline Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, South Korea; Center for Energy Materials Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea; Korea Atomic Energy Research Institute (KAERI), Daedeok-daero 989 Beon-Gil, Yuseong-gu, Daejeon, 34057, South Korea
推荐引用方式 GB/T 7714	Park H.,Lee Y.,Cho M.-K.,et al. Na2Fe2F7: A fluoride-based cathode for high power and long life Na-ion batteries[J],2021,14(3).
APA	Park H..,Lee Y..,Cho M.-K..,Kang J..,Ko W..,...&Kim J..(2021).Na2Fe2F7: A fluoride-based cathode for high power and long life Na-ion batteries.Energy & Environmental Science,14(3).
MLA	Park H.,et al."Na2Fe2F7: A fluoride-based cathode for high power and long life Na-ion batteries".Energy & Environmental Science 14.3(2021).