Nitrogen-plasma doping of carbon film for a high-quality layered Si/C composite anode.

Autor: Zhang ZD; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China., Zhou HP; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China; Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China. Electronic address: haipzhou@uestc.edu.cn., Xue WD; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China., Zhao R; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China., Wang WJ; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China., Feng TT; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China; Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China., Xu ZQ; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China; Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China., Zhang S; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China; Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China., Liao JX; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China., Wu MQ; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China; Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China. Electronic address: mwu@uestc.edu.cn.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2022 Jan; Vol. 605, pp. 463-471. Date of Electronic Publication: 2021 Jul 20.
DOI: 10.1016/j.jcis.2021.06.147
Abstrakt: The effect of the chemical component and microstructure, not to mention their facile modification, of the coating/wrapping carbon layer on the electrochemical performance of the Si/C composite anode in lithium ion batteries (LIBs) hasn't been actively explored although Si/C has been recognized as one of the most promising route for the high energy density LIBs. Herein we propose a novel nitrogen-plasma doping route to modify the top carbon film in an elaborately constructed layered Si/C composite anode. The electrochemical performance, e.g., the initial coulombic efficiency (CE), cycle stability and specific capacity of the composite anode is drastically improved by this plasma processing due to the increased kinetics of lithium ions. By means of the appropriate adjustment of the N doping ratio and N chemical configuration in the carbon layer through a N 2 /H 2 plasma processing, the lithium diffusion rate in the composite anode was memorably increased as the pseudocapacitance effects promoted. The optimized Si/C composite exhibits a high capacity of 1120.7 mA h g -1 and an initial CE of 80.8% at the current of 2 A g -1 after a long cycle of 1500, increasing by ~40% of specific capacity and ~29% of the initial CE.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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