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DOI	10.1039/d0ee01607a
	K+modulated K+/vacancy disordered layered oxide for high-rate and high-capacity potassium-ion batteries
	Xiao Z.; Meng J.; Xia F.; Wu J.; Liu F.; Zhang X.; Xu L.; Lin X.; Mai L.
发表日期	2020
ISSN	17545692
起始页码	3129
结束页码	3137
卷号	13 期号:9
英文摘要	With high theoretical capacity and applicable operating voltage, layered transition metal oxides are potential cathodes for potassium-ion batteries (PIBs). However, a K+/vacancy ordered structure in these oxides limits the K+ transport kinetics and storage sites so that the PIBs still have poor rate performance and low achievable capacity. Here, to effectively resolve the problem, a K+/vacancy disordered P3-type structure is designed and synthesized by simply modulating the K+ contents in Mn/Ni-based layered oxides. The effect of the K+ contents in a series of KxMn0.7Ni0.3O2 (x = 0.4-0.7) oxides has been systematically studied and it is found that while the K+/vacancy ordered superstructure is stable at low K+ content (x < 0.6), a complete K+/vacancy disordered structure forms at high K+ content (x > 0.6), evidenced by selected area electron diffraction and voltage plateaus in the charge/discharge curves. The K+/vacancy disordered K0.7Mn0.7Ni0.3O2 exhibits much better rate performance and higher discharge capacity, compared to the K+/vacancy ordered K0.4Mn0.7Ni0.3O2. Molecular dynamic simulations confirm that the K+/vacancy disordered structure possesses interconnected continuous channels for K+ diffusion and more active storage sites. This discovery sheds light on rational design of K+/vacancy disordered layered oxide cathodes for next-generation high-performance PIBs. This journal is © The Royal Society of Chemistry.
英文关键词	Cathodes; Electron diffraction; Molecular dynamics; Potassium; Secondary batteries; Transition metal oxides; Transition metals; Charge/discharge curves; Discharge capacities; Disordered structures; Layered oxide cathodes; Ordered structures; Ordered superstructures; Selected area electron diffraction; Theoretical capacity; Nickel compounds; concentration (composition); equipment component; oxide group; potash; potassium
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/189573
作者单位	State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China; Nanostructure Research Centre (NRC), Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China; Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Jiujiang Research Institute, Xiamen University, Xiamen, 361005, China; Foshan Xianhu Laboratory, Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan, 528200, China
推荐引用方式 GB/T 7714	Xiao Z.,Meng J.,Xia F.,et al. K+modulated K+/vacancy disordered layered oxide for high-rate and high-capacity potassium-ion batteries[J],2020,13(9).
APA	Xiao Z..,Meng J..,Xia F..,Wu J..,Liu F..,...&Mai L..(2020).K+modulated K+/vacancy disordered layered oxide for high-rate and high-capacity potassium-ion batteries.Energy & Environmental Science,13(9).
MLA	Xiao Z.,et al."K+modulated K+/vacancy disordered layered oxide for high-rate and high-capacity potassium-ion batteries".Energy & Environmental Science 13.9(2020).