用于高能量密度 CFx 阴极的氟化聚合物衍生微孔碳球

IF 5.4 1区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY GIANT Pub Date : 2024-05-08 DOI:10.1016/j.giant.2024.100273
Ziyue Zhao , Lingchen Kong , Jinxu Sun , Yu Li , Wei Feng
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引用次数: 0

摘要

氟化碳(CFx)化合物因其能量密度高而在锂原电池阴极中有着广泛的应用。本研究以 Pluronic F127 为模板剂,以软模板辅助高温碳化和化学活化产生的微孔碳球为前驱体,通过调节软模板 F127 的添加量,采用低温氟化工艺合成了一种具有优异电化学性能的新型 CFx 化合物。微球尺寸的减小、粒度分布的缩小以及缺陷的引入有助于提高 CFx 的 F-C 摩尔比(F/C),同时保持 C-F 键的电化学活性。高氟化程度的氟化聚合物衍生微孔碳球(FPMCSs)的比容量可与商用氟化石墨(FG)媲美。微球形态和微孔结构不仅为电极过程中的氟化反应提供了丰富的场所,而且有利于 Li+ 扩散,从而确保了充足的速率能力。合成的 FPMCSs 的峰值比容量为 1079 mAh g-1,最大能量密度为 2679 Wh kg-1(大大超过商用 FG 的 2180 Wh kg-1)。因此,所制备的 FPMCSs 强调了选择合适的碳质材料和精心设计结构的重要性,显示了未来利用易于获得且具有成本效益的原材料实现 CFx 阴极高能量密度的巨大潜力。
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Fluorinated polymer-derived microporous carbon spheres for CFx cathodes with high energy density

Fluorinated carbon (CFx) compounds have extensive applications in lithium primary battery cathodes owing to their high energy density. In this investigation, a novel CFx compound offering superior electrochemical properties was synthesized via a low-temperature fluorination process, utilizing Pluronic F127 as a template agent and microporous carbon spheres produced through soft template-assisted high-temperature carbonization and chemical activation as precursors, and by regulating the amount of soft template F127 added. The reduction in microsphere size, narrower particle size distribution, and introduction of defects contribute to augmenting the molar ratio of F to C (F/C) of CFx while preserving the electrochemical activity of C-F bonds. The specific capacity of fluorinated polymer-derived microporous carbon spheres (FPMCSs) with a high fluorination degree rivals that of commercial fluorinated graphite (FG). The microsphere morphology and microporous structure not only furnish abundant sites for fluorination reactions in electrode processes but also facilitate Li+ diffusion, ensuring ample rate capability. The synthesized FPMCSs exhibited a peak specific capacity of 1079 mAh g–1 and a maximum energy density of 2679 Wh kg–1 (substantially surpassing the 2180 Wh kg–1 of commercial FG). Hence, the prepared FPMCSs underscore the significance of selecting suitable carbonaceous materials and designing structures deliberately, showing promising potential for achieving high energy density in CFx cathodes in the future, employing readily available and cost-effective raw materials.

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来源期刊
GIANT
GIANT Multiple-
CiteScore
8.50
自引率
8.60%
发文量
46
审稿时长
42 days
期刊介绍: Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.
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