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DOI	10.1039/c8ee01611a
	Zero-strain K0.6Mn1F2.7 hollow nanocubes for ultrastable potassium ion storage
	Liu Z.; Li P.; Suo G.; Gong S.; Wang W.; Lao C.-Y.; Xie Y.; Guo H.; Yu Q.; Zhao W.; Han K.; Wang Q.; Qin M.; Xi K.; Qu X.
发表日期	2018
ISSN	17545692
起始页码	3033
结束页码	3042
卷号	11 期号:10
英文摘要	Potassium-ion batteries (KIBs) are an attractive energy storage system due to their advantages of low cost and abundant potassium resources. However, their rapid development is greatly impeded by their low capacity and poor stability, due in particular to their much larger volumetric expansion compared to transition metal lithium-ion batteries. Herein, we report a new etching route to fabricate a new class of zero-strain potassium fluoromanganate hollow nanocubes (KMnF-NCs) for boosting the performance of KIBs in terms of capacity, rate capability and cycling stability. The as-made KMnF-NCs containing rich K and F vacancies exhibit a high capacity and super high stability by showing a specific capacity of 110 mA h g-1 even after 10000 cycles, which is the best stability for KIBs. In situ X-ray diffraction and the first-principles calculations reveal a new storage mechanism for KIBs, in which the intercalation/deintercalation of K ions into/from the K and F vacancies (as a battery behavior) and the adsorption/desorption onto/from the surface (as a pseudocapacitance characteristic) are the key to increasing the capacity of KIBs. Most importantly, we found that during the discharge process, the volume expansion of the etched KMnF-NC was only 1.4%, which is much lower as compared to well-known negative materials, showing great potential as a new class of high-performance zero-strain negative materials for KIBs. © 2018 The Royal Society of Chemistry.
英文关键词	Calculations; Expansion; Ions; Lithium-ion batteries; Potassium compounds; Stability; Storage (materials); Transition metals; Adsorption/desorption; Energy storage systems; First-principles calculation; In-situ X-ray diffraction; Intercalation/deintercalation; Negative materials; Specific capacities; Volumetric expansion; Manganese compounds; adsorption; desorption; energy storage; etching; performance assessment; potassium; transition element; X-ray diffraction
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/190104
作者单位	Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China; Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, United Kingdom; China Institute of Atomic Energy, P. O. Box 275(10), Beijing, 102413, China
推荐引用方式 GB/T 7714	Liu Z.,Li P.,Suo G.,et al. Zero-strain K0.6Mn1F2.7 hollow nanocubes for ultrastable potassium ion storage[J],2018,11(10).
APA	Liu Z..,Li P..,Suo G..,Gong S..,Wang W..,...&Qu X..(2018).Zero-strain K0.6Mn1F2.7 hollow nanocubes for ultrastable potassium ion storage.Energy & Environmental Science,11(10).
MLA	Liu Z.,et al."Zero-strain K0.6Mn1F2.7 hollow nanocubes for ultrastable potassium ion storage".Energy & Environmental Science 11.10(2018).