Pore structure regulation of hard carbon: Towards fast and high-capacity sodium-ion storage.,Journal of Colloid and Interface Science

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Pore structure regulation of hard carbon: Towards fast and high-capacity sodium-ion storage.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.jcis.2020.01.085
Le Yang ₁ , Mingxiang Hu ₂ , Hongwei Zhang ₂ , Wen Yang ₃ , Ruitao Lv ₄

Affiliation

Hard carbon is regarded as one of the most promising anode material for sodium-ion batteries in virtue of the low cost and stable framework. However, the correlation between pore structures of hard carbon and sodium-ion storage is still ambiguous. In this work, based on precise control of pore-size distribution, the capacity, ion diffusion, and initial Coulombic efficiency were improved. Meanwhile, the relationship between pore structure and capacity was investigated. Our result indicates that the micropores hinder ion diffusion and hardly ever accommodate Na+ ions, while mesopores facilitate Na+ ion intercalation. Hard carbon with negligible micropores and abundant mesopores delivers a maximum capacity of 283.7 mAh g-1 at 20 mA g-1, which is 83% higher than that of micropore-rich one. Even after 320 cycles at 200 mA g-1, the capacity still remains 189.4 mAh g-1.

中文翻译：

硬碳的孔结构调节：快速，大容量的钠离子存储。

由于低成本和稳定的结构，硬碳被认为是钠离子电池最有希望的负极材料之一。但是，硬碳的孔结构与钠离子存储之间的相关性仍然不明确。在这项工作中，在精确控制孔径分布的基础上，提高了容量，离子扩散和初始库仑效率。同时，研究了孔结构与容量之间的关系。我们的结果表明，微孔会阻碍离子扩散，几乎不会容纳Na +离子，而中孔则有助于Na +离子的嵌入。硬碳具有微孔可忽略不计，中孔丰富，在20 mA g-1时可提供283.7 mAh g-1的最大容量，比富含微孔的硬质碳的容量高83％。即使在200 mA g-1下进行320次循环后，

更新日期：2020-01-23

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