Lithium-ion capacitors (LICs) are now drawing increasing attention because of their potential to overcome the current energy limitations of supercapacitors and power limitations of lithium-ion batteries. In this work, we designed LICs by combining an electric double-layer capacitor cathode and a lithium-ion battery anode. Both the cathode and anode are derived from graphene-modified phenolic resin with tunable porosity and microstructure. They exhibit high specific capacity, superior rate capability and good cycling stability. Benefiting from the graphene-enhanced electrode materials, the all graphene-based LICs demonstrate a high working voltage (4.2 V), high energy density of 142.9 Wh kg-1, maximum power density of 12.1 kW kg-1with energy density of 50 Wh kg-1, and long stable cycling performance (with ~ 88% capacity retention after 5000 cycles). Considering the high performance of the device, the cost-effective and facile preparation process of the active materials, this all graphene-based lithium-ion capacitor could have many promising applications in energy storage systems.

中文翻译：

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采用双石墨烯材料制造的高性能锂离子电容器

锂离子电容器 (LICs) 现在受到越来越多的关注，因为它们有可能克服当前超级电容器的能量限制和锂离子电池的功率限制。在这项工作中，我们通过结合双电层电容器阴极和锂离子电池阳极来设计 LIC。阴极和阳极均源自石墨烯改性酚醛树脂，具有可调的孔隙率和微观结构。它们表现出高比容量、优异的倍率性能和良好的循环稳定性。得益于石墨烯增强的电极材料，所有基于石墨烯的 LIC 均表现出高工作电压（4.2 V）、142.9 Wh kg-1 的高能量密度、12.1 kW kg-1 的最大功率密度和 50 Wh kg 的能量密度-1，以及长期稳定的循环性能（5000 次循环后容量保持率约为 88%）。