Li-ion capacitors (LICs), a typical hybrid configuration constructed by combining a capacitive cathode and a battery-type anode with Li-salt based organic electrolytes, are drawing research attention to increase energy densities of the existing state-of-the-art supercapacitors. However, the promising future of hybrid devices is injured by the imbalance of electrochemical kinetics and capacities between the battery-like anodes and capacitive cathodes. Herein, we devise a bio-template strategy to synthesize the highly porous carbon and Fe derivatives@carbon (Fe@C) composite from the same precursor of strawberries. The obtained porous carbon shows a sheet-like morphology with a high specific surface area of 2987 m²/g. Electrochemical evaluation of the 2D porous carbon sheet delivers a high specific capacity of 140.3 mAh/g (202 F/g) and excellent rate capability. The achieved mesoporous Fe@C composite delivers a high specific capacity of 576.3 mAh/g at 0.1 A/g, and even 202.8 mAh/g at 10 A/g. A novel LIC assembled using the porous carbon and Fe@C composite as the positive and negative electrodes yields a high energy density of 97 Wh/kg at 250 W/kg. The scalable methodology here paves the way for widespread commercialization of the advanced yet cost-efficient LICs.

中文翻译：

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Fe衍生物@碳复合材料和多孔碳片的绿色生物模板制备，以低成本锂电极为高级电极

锂离子电容器（LICs）是通过将电容性阴极和电池型阳极与基于锂盐的有机电解质相结合而构成的典型混合配置，正在引起研究关注以提高现有技术水平的能量密度超级电容器。然而，混合动力装置的有前途的未来因电池状阳极和电容性阴极之间电化学动力学和容量的不平衡而受到损害。在本文中，我们设计了一种生物模板策略，以从草莓的同一前体合成高度多孔的碳和Fe衍生物碳（Fe @ C）复合材料。所获得的多孔碳显示出具有2987m ²的高比表面积的片状形态。/G。二维多孔碳板的电化学评估可提供140.3 mAh / g（202 F / g）的高比容量和出色的倍率性能。所获得的介孔Fe @ C复合材料在0.1 A / g时可提供576.3 mAh / g的高比容量，在10 A / g时甚至可提供202.8 mAh / g的高比容量。使用多孔碳和Fe @ C复合材料作为正极和负极组装的新型LIC在250 W / kg时产生97 Wh / kg的高能量密度。这里的可扩展方法为先进而经济高效的LIC的广泛商业化铺平了道路。