DOI: 10.1016/j.scib.2020.07.001
论文题名: Enlarged interlayer spacing and enhanced capacitive behavior of a carbon anode for superior potassium storage
作者: Shi X. ; Zhang Y. ; Xu G. ; Guo S. ; Pan A. ; Zhou J. ; Liang S.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 23 起始页码: 2014
结束页码: 2021
语种: 英语
中文关键词: Capacitive behavior
; Carbon interlayer
; Co-doping of nitrogen and sulfur atoms
; Potassium-ion batteries
; Synergistic effects
英文关键词: Carbon
; Density functional theory
; Electrochemical electrodes
; Electrochemical impedance spectroscopy
; Ions
; Lithium-ion batteries
; Redox reactions
; Stability
; Storage (materials)
; Adsorption behavior
; Capacitive behavior
; Electronic conductivity
; Galvanostatic Intermittent Titration Techniques
; High reversible capacities
; Interlayer spacings
; Storage properties
; Structural stabilities
; Potassium
英文摘要: Potassium-ion batteries (PIBs) hold great potential as an alternative to lithium-ion batteries due to the abundant reserves of potassium and similar redox potentials of K+/K and Li+/Li. Unfortunately, PIBs with carbonaceous electrodes present sluggish kinetics, resulting in unsatisfactory cycling stability and poor rate capability. Herein, we demonstrate that the synergistic effects of the enlarged interlayer spacing and enhanced capacitive behavior induced by the co-doping of nitrogen and sulfur atoms into a carbon structure (NSC) can improve its potassium storage capability. Based on the capacitive contribution calculations, electrochemical impedance spectroscopy, the galvanostatic intermittent titration technique, and density functional theory results, the NSC electrode is found to exhibit favorable electronic conductivity, enhanced capacitive adsorption behavior, and fast K+ ion diffusion kinetics. Additionally, a series of ex-situ characterizations demonstrate that NSC exhibits superior structural stability during the (de)potassiation process. As a result, NSC displays a high reversible capacity of 302.8 mAh g−1 at 0.1 A g−1 and a stable capacity of 105.2 mAh g−1 even at 2 A g−1 after 600 cycles. This work may offer new insight into the effects of the heteroatom doping of carbon materials on their potassium storage properties and facilitate their application in PIBs. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170032
Appears in Collections: 气候变化与战略
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作者单位: School of Materials Science and Engineering, Central South University, Changsha, 410083, China; National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China, Hefei, 230029, China; Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha, 410083, China
Recommended Citation:
Shi X.,Zhang Y.,Xu G.,et al. Enlarged interlayer spacing and enhanced capacitive behavior of a carbon anode for superior potassium storage[J]. Science Bulletin,2020-01-01,65(23)