Commercial Carbon Fibers as Host for Sodium Deposition to Achieve High Volumetric Capacity

IF 18.5 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Tianyi Ji, Xiaoxu Liu, Tian Wang, Yunli Shi, Dawei Sheng, Xiaodong Hao, Chaozheng He, Zexiang Shen
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Abstract

The advancement of flexible electronic devices necessitates the utilization of electrode materials that offer robustness and high capacity. In this paper, it is revealed that commercially available carbon fibers with specific microcrystalline structures not only have high mechanical strength but also a high volumetric capacity of up to 300 mAh cm−3, surpassing conventional carbon materials. When multiple structural parameters of carbon fiber reach certain thresholds, a breakthrough in sodium storage capacity and rate performance can be achieved. This study further elucidates the mechanism whereby this specific carbon fiber primarily utilizes an all‐plateau sodium deposition mechanism, which occurs in pore‐like grain boundaries. Through in situ spectroscopy and synchrotron techniques, the reversible deposition process of metallic sodium has been revealed at different scales. Theoretical calculations and thermodynamic principles further confirm the desolvation and deposition mechanisms in carbon fibers. As a result, this research discovers the modulating effects and patterns of crystallinity, defect, and orientation of carbon materials on sodium storage sites and diffusion kinetics, thereby achieving controlled sodium storage. This work shows that commercial carbon fibers can serve as robust hosts for sodium deposition and enhances the theoretical understanding of how the microcrystalline structure of carbon materials relates to sodium storage properties.
商用碳纤维作为钠沉积的宿主实现高容积容量
柔性电子设备的发展要求电极材料具有坚固性和高容量。本文揭示了具有特定微晶结构的市售碳纤维不仅具有很高的机械强度,而且还具有高达 300 mAh cm-3 的高容积容量,超过了传统的碳材料。当碳纤维的多个结构参数达到一定临界值时,就能实现钠存储容量和速率性能的突破。本研究进一步阐明了这种特定碳纤维主要利用全平台钠沉积机制的机理,该机制发生在孔隙状晶界中。通过原位光谱和同步辐射技术,揭示了金属钠在不同尺度上的可逆沉积过程。理论计算和热力学原理进一步证实了碳纤维中的脱溶和沉积机制。因此,这项研究发现了碳材料的结晶度、缺陷和取向对钠储存位点和扩散动力学的调节作用和模式,从而实现了可控钠储存。这项研究表明,商用碳纤维可作为钠沉积的稳健宿主,并加深了人们对碳材料微晶结构与钠存储特性之间关系的理论理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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