Study on sodium storage behavior of hard carbons derived from coal with different grades of metamorphism

被引：0

作者：

Wang B. ^{[1
]}

Xia J. ^{[1
]}

Dong X. ^{[1
]}

Guo H. ^{[1
]}

Li W. ^{[1
]}

机构：

[1] School of Chemical Engineering, Dalian University of Technology, Dalian

来源：

Li, Wencui (wencuili@dlut.edu.cn) | 1600年 / Materials China卷 / 72期

关键词：

Electrochemistry; Hard carbon; Lignite; Preparation; Pyrolysis; Sodium-ion batteries;

D O I：

10.11949/0438-1157.20210668

中图分类号：

学科分类号：

摘要：

Coal has the advantages of high carbon content, developed aromatic structure and low cost. It is a high-quality precursor for the preparation of hard carbon anode materials for sodium ion batteries. However, the graphitization degree, carbon layer spacing, and chemical composition of the coal-based hard carbons are different due to the complex structure and the presence of inorganic impurity in the various kinds of coal, which makes it challenging to optimize the electrochemical performance of coal-based hard carbon anodes. Herein, four types of coal with different grades of metamorphism are chosen to prepare a series of coal-based hard carbons by acid elution of ash and high-temperature carbonization treatment. Furthermore, the effects of the metamorphic grade and carbonization temperature on the microcrystalline structure and surface heteroatomic composition of coal-based hard carbon were studied, and the corresponding sodium storage behaviors were investigated as well. Therein, the hard carbon anode derived from lignite carbonized at 1400℃ exhibits the optimum performance, a high capacity of 338.8 mA·h·g-1 is delivered at a current density of 0.02 A·g-1 and a high initial Coulombic efficiency of 81.1% is displayed. The excellent electrochemical performance can be attributed to the larger carbon layer spacing and rich reversible sodium storage defect sites, which provide more sites for embedding and adsorbing sodium storage. © 2021, Editorial Board of CIESC Journal. All right reserved.

引用

页码：5738 / 5750

页数：12

共 9 条

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