Elucidating the effects of the carbon source on fluorination kinetics and the CFx structure to tailor the energy density of Li/CFx†

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Shixue Zhang, Yu Li, Hang Xu, Cong Peng, Lingchen Kong, Zhihao Gui and Wei Feng
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Abstract

Li/CFx batteries are an essential energy source for advancing smart medicine and deep-space exploration, yet increasing their energy density is crucial for large-scale applications. However, CFx cathode development is hindered due to the voltage–capacity trade-off when the actual synthesis is considered. To solve this problem, the mechanism of fluorination and key factors that affect the fluorine pattern must be determined. In this study, we propose a diffusion-controlled fluorination mechanism, and the critical role of the carbon source structure in the fluorination kinetics and fluorine pattern of the formed CFx is revealed. As a proof-of-concept, we prepared a series of hierarchical porous carbons (HPCs) and promoted fluorination kinetics with their well-developed hierarchical pore structure, achieving a high fluorine content from full interior fluorination and an altered fluorine pattern. In addition, the low fluorination temperature enabled by HPCs helped preserve the skeleton structure and improve the conductivity, resulting in an excellent maximum energy density of 2902.45 W h kg−1 (0.05C) and power density of 74.837 kW kg−1 at 50C. Orthogonal experiments, which facilitated the tailoring of battery performance, demonstrated the synergistic effect of the carbon source and fluorination temperature for the first time. This study provides theoretical and practical guidance for designing and implementing CFx cathodes for ultrahigh-energy-density Li/CFx batteries, and the results pave the way for various large-scale applications of Li/CFx batteries in the future.

Abstract Image

阐明碳源对氟化动力学和 CFx 结构的影响以调整 Li/CFx 的能量密度
锂/CFx 电池是推进智能医疗和深空探测的重要能源,提高其能量密度对大规模应用至关重要。然而,在实际合成过程中,由于电压与容量的权衡问题,CFx 正极的开发受到了阻碍。要解决这一问题,必须确定氟化机理和影响氟形态的关键因素。在本研究中,我们提出了一种扩散控制的氟化机制,并揭示了碳源结构在氟化动力学和所形成的 CFx 的氟形态中的关键作用。作为概念验证,我们制备了一系列分层多孔碳(HPCs),并利用其发达的分层孔隙结构促进了氟化动力学,从而实现了全内部氟化的高氟含量和氟形态的改变。此外,HPCs 的低氟化温度有助于保持骨架结构和提高导电性,从而使最大能量密度达到 2902.45 Wh kg-1 (0.05 C)。正交实验有助于定制电池性能,首次证明了碳源和氟化温度的协同效应。该研究为超高能量密度锂电池/CFx 电池 CFx 阴极的设计和实现提供了理论和实践指导,其结果为未来锂电池/CFx 电池的各种大规模应用铺平了道路。
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
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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