High performance Li-ion capacitor fabricated with dual graphene-based materials

Sui, D (Sui, Dong)^{[ 1,2,3,4 ]} ; Wu, MM (Wu, Manman)^{[ 2,3,4 ]} ; Liu, YY (Liu, Yiyang)^{[ 2,3,4,5 ]} ; Yang, YL (Yang, Yanliang)^{[ 1 ]} ; Zhang, HT (Zhang, Hongtao)^{[ 2,3,4 ]} ; Ma, YF (Ma, Yanfeng)^{[ 2,3,4 ]} ; Zhang, L (Zhang, Long)^{[ 6 ]} ; Chen, YS (Chen, Yongsheng)^{[ 2,3,4 ]}

NANOTECHNOLOGY, 2021, 32(1): 文献号: 015403

DOI: 10.1088/1361-6528/abb9d8

摘要

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(-1)with energy density of 50 Wh kg(-1), and long stable cycling performance (with similar to 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.