微型多孔材料
法拉第效率
碳纤维
阳极
扩散
化学工程
离子
介孔材料
钠
材料科学
插层(化学)
化学
无机化学
有机化学
复合数
热力学
复合材料
物理化学
工程类
物理
催化作用
电极
作者
Le Yang,Mingxiang Hu,Hongwei Zhang,Wen Yang,Ruitao Lv
标识
DOI:10.1016/j.jcis.2020.01.085
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI