Issue 17, 2023

Molten salt assisted fabrication of coal-based carbon anode materials for efficient Na ion storage

Abstract

The development of high-performance and low-cost anode materials plays a crucial role in the commercialization of sodium-ion batteries (SIBs). Coke coal is an excellent carbon precursor with high carbon content, wide distribution, and abundant reserves. Nevertheless, the microcrystalline structure of coke coal-based pyrolytic carbon is relatively regular with narrow interlayer spacing, resulting in poor electrochemical performance. Herein, a coal-based carbon microcrystalline heterostructure with greatly improved structural disordering was fabricated via the cross-linking reaction between functional groups of coke coal and sucrose with the assistance of a molten salt system. Unlike coke coal-based pyrolytic carbon (BCoal-700), the coal-based carbon microcrystalline heterostructure material (BCoal-SM-700) exhibited a significantly increased Na-storage capacity from 125.4 to 286.5 mA h g−1, with excellent cycle and rate performance. When assembled into a sodium-ion hybrid capacitor, it exhibited an energy density of 103 W h kg−1 at a power density of 216 W kg−1. The molten salt procedure offers a simple, eco-friendly, and recyclable approach for the synthesis of coal/sucrose microcrystalline heterostructure carbon materials that can exhibit excellent Na-storage performance, making them promising candidates for SIBs.

Graphical abstract: Molten salt assisted fabrication of coal-based carbon anode materials for efficient Na ion storage

Supplementary files

Article information

Article type
Research Article
Submitted
14 Jun 2023
Accepted
17 Jul 2023
First published
21 Jul 2023

Inorg. Chem. Front., 2023,10, 5117-5126

Molten salt assisted fabrication of coal-based carbon anode materials for efficient Na ion storage

W. Zhang, N. Sun, H. Chen, R. A. Soomro and B. Xu, Inorg. Chem. Front., 2023, 10, 5117 DOI: 10.1039/D3QI01118F

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