Soft-carbon-tuned hard carbon anode for ultrahigh-rate sodium storage

IF 4.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY 2D Materials Pub Date : 2024-09-12 DOI:10.1088/2053-1583/ad77e1
Hongjin Dai, Yufang Cao and Jingyu Sun
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Abstract

High-rate hard carbon anode is critical for achieving fast-charging sodium-ion batteries, whereas the limited ion/electron kinetics caused by unexpected surface defects and unsatisfactory conductivity greatly limits rate capability. Herein, a coconut shell-derived soft-carbon-tuned hard carbon (SHC) with low surface area (4.7 m2 g−1) was prepared. With SHCs as bricks, a high conductivity single-walled carbon nanotube (SWNT)-bonded hard carbon film was constructed. The pitch-derived soft carbon formed on SHCs can effectively decrease the surface defects and simultaneously induce optimized disordered graphite domains into carbon matrix, enabling high Na+ reversibility and ionic/electronic conductivity. The crosslinked SWNTs in-between can provide continuous ion/charge transport ‘highways’, thus ensuring rapid ion/electron kinetics. As a result, such a self-supporting carbon anode exhibits remarkable rate performance (330 mAh g−1 at 0.1 C and 272 mAh g−1 at 5 C), superior initial Coulombic efficiency of 95.2% and outstanding cycling stability.
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用于超高速钠储存的软碳调谐硬碳阳极
高倍率硬碳阳极是实现钠离子电池快速充电的关键,而意外的表面缺陷和不理想的导电性导致的离子/电子动力学限制极大地限制了倍率能力。本文制备了一种低表面积(4.7 m2 g-1)的椰壳衍生软碳调谐硬碳(SHC)。以 SHC 为砖,构建了高导电率的单壁碳纳米管(SWNT)结合硬碳薄膜。在 SHC 上形成的沥青衍生软碳可有效减少表面缺陷,同时将优化的无序石墨畴诱导到碳基体中,从而实现高 Na+ 可逆性和离子/电子导电性。中间交联的 SWNT 可提供连续的离子/电荷传输 "高速公路",从而确保快速的离子/电子动力学。因此,这种自支撑碳阳极具有卓越的速率性能(0.1 C 时为 330 mAh g-1,5 C 时为 272 mAh g-1)、95.2% 的出色初始库仑效率和出色的循环稳定性。
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来源期刊
2D Materials
2D Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
10.70
自引率
5.50%
发文量
138
审稿时长
1.5 months
期刊介绍: 2D Materials is a multidisciplinary, electronic-only journal devoted to publishing fundamental and applied research of the highest quality and impact covering all aspects of graphene and related two-dimensional materials.
期刊最新文献
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