Inhibiting the cyclization of PAN by carboxyl groups for carbon nanofibers with balanced Na+ storage performance and ICE

被引：2

作者：

Hu F. ^{[1
]}

Yang E. ^{[1
]}

Shao W. ^{[2
]}

Liu S. ^{[1
]}

Han J. ^{[1
]}

Wang L. ^{[1
]}

Jin X. ^{[1
]}

Jian X. ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Key Laboratory of Energy Materials and Devices (Liaoning Province), Dalian University of Technology, Dalian

[2] State Key Laboratory of Fine Chemicals, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian

来源：

Applied Surface Science | 2022年 / 594卷

关键词：

Highly disordered structure; Internal pores; Limited cyclization; Nanofibers; Sodium-ion battery;

D O I：

10.1016/j.apsusc.2022.153447

中图分类号：

学科分类号：

摘要：

Hard carbon nanofiber derived from electrospinning polyacrylonitrile (PAN) is regarded as the promising electrode featuring the low-cost and simple preparation advantages, while it possesses the low plateau capacity, limiting its application as anode for the sodium ion (Na+) storage technologies. The main obstacle is that the cyclization of PAN during stabilization leads to the formation of ordered carbon structures. Herein, nanofibers anodes with disordered structures and abundant internal nanopores are fabricated by using carboxyl-functionalized PAN. The cyan (–CN) of PAN turns to sodium carboxylate (–COONa) during the hydrolysis process in NaOH solution, so that the cyclization in stabilization process is limited and realizing disordered carbon structures. Meanwhile, the formation of –COONa can lead to hard carbon with abundant internal pores, thereby resulting in an extended plateau region during discharging. The optimized PCNFs2-700-1400 anode delivers a satisfactory reversible capacity of 286 mAh/g at 0.02 A/g with an initial coulombic efficiency (ICE) of 73%. The larger plateau capacity of 183 mAh/g is ascribed to the filling of Na+ in the internal pores and insertion in the pseudo-graphitic. This strategy is expected to help enhance the understanding of Na+ storage “adsorption-insertion-pore filling” mechanism in PAN-derived hard carbon. © 2022 Elsevier B.V.

引用

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