Pore Structure Modification of Pitch-Derived Hard Carbon for Enhanced Pore Filling Sodium Storage,Energy Technology

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Pore Structure Modification of Pitch-Derived Hard Carbon for Enhanced Pore Filling Sodium Storage
Energy Technology ( IF 3.6 ) Pub Date : 2022-08-24 , DOI: 10.1002/ente.202200612
Xu Zhang ₁ , Weilun Chen ₁ , Jiayu Peng ₁ , Yixuan Guo ₁ , Lianghu Cheng ₁ , Nian Chen ₂ , Rui Du ₂ , Yunhui Huang ₁ , Lihong Xue ₁ , Wuxing Zhang ₁

Affiliation

The pore structure of hard carbon has an important influence on its sodium storage performance. Herein, pitch-derived hard carbons with different pore structures have been prepared via the combination of physical activation and vapor carbon coating. It reveals that the open pores favor the slope capacity while the closed pores can promote the plateau capacity, which consolidates the pore-filling mechanism of hard carbon during the sodium storage in the plateau region. HC1400-5 h@PP with rich closed micropores can deliver a reversible specific capacity of 299.1 mAh g⁻¹ with initial Coulombic efficiency of 81.1%. The plateau capacity accounts for 66.6% of the total capacity. Ex situ Raman and galvanostatic intermittent titration investigations show that there exists an energy barrier for the Na deposition in the closed pores, leading to the rapid decay of plateau capacity at a high current density.

中文翻译：

沥青衍生硬碳孔隙结构改性增强孔隙充钠储钠

硬碳的孔结构对其储钠性能有重要影响。在此，通过物理活化和气相碳涂层的结合，制备了具有不同孔结构的沥青衍生硬碳。结果表明，开孔有利于斜坡容量，而闭孔有利于高原容量，巩固了高原地区储钠过程中硬碳的孔隙填充机制。HC1400-5 h@PP 具有丰富的封闭微孔，可提供 299.1 mAh g ^{-1的可逆比容量}初始库仑效率为 81.1%。高原产能占总产能的66.6%。异位拉曼和恒电流间歇滴定研究表明，封闭孔中存在钠沉积的能量势垒，导致高电流密度下平台容量的快速衰减。

更新日期：2022-08-24

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