Influence of Particle Size of Lignite-Based Hard Carbon on Sodium Storage Performance

IF 1.9 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Zhitao Yang, Yukuan Wei, Gang Liu, Leilei Zhang, Tengfei Huang, Haohao Xue, Yuhang Zhang, Zishun Lin
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Abstract

The particle size of hard carbon used as an anode material for sodium-ion batteries (SIBs) directly affects critical physical properties, including specific surface area and conductivity of the electrode, thereby influencing the electrode's sodium storage performance. However, related research is limited. In this work, lignite-derived hard carbons with various particle sizes were investigated as anode materials for SIBs. The electrochemical performance and Na+ diffusion capability were evaluated. The results show that smaller particle sizes in hard carbon anodes lead to reduced mesopore volumes, specific surface areas, and coating densities, which effectively improve cycle stability, initial coulombic efficiency (ICE), and rate capability of the electrode. Specifically, hard carbon anodes within a 1–15 µm particle size distribution exhibited a reversible capacity of 251 mAh g−1 and an ICE of 73.67% at a current density of 25 mA g−1. Even after 100 cycles at 0.2 C, these anodes maintained a reversible capacity of 238 mAh g−1, achieving a capacity retention rate of 99.85%.

Abstract Image

褐煤基硬炭粒径对储钠性能的影响
作为钠离子电池(sib)负极材料的硬碳颗粒大小直接影响电极的关键物理性能,包括比表面积和电导率,从而影响电极的储钠性能。然而,相关研究有限。在这项工作中,研究了褐煤衍生的不同粒径的硬碳作为sib的阳极材料。对其电化学性能和Na+扩散性能进行了评价。结果表明,在硬碳阳极中,粒径越小,介孔体积、比表面积和涂层密度越小,电极的循环稳定性、初始库仑效率(ICE)和速率性能得到有效改善。具体来说,1 - 15µm粒径分布的硬碳阳极在25 mA g−1电流密度下的可逆容量为251 mAh g−1,ICE为73.67%。即使在0.2 C下循环100次后,这些阳极也保持了238 mAh g−1的可逆容量,实现了99.85%的容量保持率。
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来源期刊
ChemistrySelect
ChemistrySelect Chemistry-General Chemistry
CiteScore
3.30
自引率
4.80%
发文量
1809
审稿时长
1.6 months
期刊介绍: ChemistrySelect is the latest journal from ChemPubSoc Europe and Wiley-VCH. It offers researchers a quality society-owned journal in which to publish their work in all areas of chemistry. Manuscripts are evaluated by active researchers to ensure they add meaningfully to the scientific literature, and those accepted are processed quickly to ensure rapid online publication.
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