气候变化领域集成服务门户(CCPortal): Enlarged interlayer spacing and enhanced capacitive behavior of a carbon anode for superior potassium storage

CCPortal

DOI	10.1016/j.scib.2020.07.001
	Enlarged interlayer spacing and enhanced capacitive behavior of a carbon anode for superior potassium storage
	Shi X.; Zhang Y.; Xu G.; Guo S.; Pan A.; Zhou J.; Liang S.
发表日期	2020
ISSN	20959273
起始页码	2014
结束页码	2021
卷号	65 期号:23
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
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
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207176
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
推荐引用方式 GB/T 7714	Shi X.,Zhang Y.,Xu G.,et al. Enlarged interlayer spacing and enhanced capacitive behavior of a carbon anode for superior potassium storage[J],2020,65(23).
APA	Shi X..,Zhang Y..,Xu G..,Guo S..,Pan A..,...&Liang S..(2020).Enlarged interlayer spacing and enhanced capacitive behavior of a carbon anode for superior potassium storage.Science Bulletin,65(23).
MLA	Shi X.,et al."Enlarged interlayer spacing and enhanced capacitive behavior of a carbon anode for superior potassium storage".Science Bulletin 65.23(2020).