Sui Dong, Wu Manman, Liu Yiyang, Yang Yanliang, Zhang Hongtao, Ma Yanfeng, Zhang Long, Chen Yongsheng
Key Laboratory of Function-Oriented Porous Materials, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, People's Republic of China.
The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
Nanotechnology. 2021 Jan 1;32(1):015403. doi: 10.1088/1361-6528/abb9d8.
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, maximum power density of 12.1 kW kg with energy density of 50 Wh kg, 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.
锂离子电容器（LIC）因其有潜力克服超级电容器当前的能量限制和锂离子电池的功率限制而越来越受到关注。在这项工作中，我们通过将双电层电容器阴极和锂离子电池阳极相结合来设计LIC。阴极和阳极均源自具有可调孔隙率和微观结构的石墨烯改性酚醛树脂。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。受益于石墨烯增强的电极材料，全石墨烯基LIC展现出高工作电压（4.2V）、142.9Wh/kg的高能量密度、在能量密度为50Wh/kg时12.1kW/kg的最大功率密度以及长循环稳定性（5000次循环后容量保持率约为88%）。考虑到该器件的高性能、活性材料具有成本效益且制备过程简便，这种全石墨烯基锂离子电容器在储能系统中可能有许多有前景的应用。
