High energy density Li-ion capacitor assembled with all graphene-based electrodes
High energy density Li-ion capacitor assembled with all graphene-based electrodes
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全石墨烯电极组装的高能量密度锂离子电容器
DOI：
10.1016/j.carbon.2015.03.032
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发表时间：
2015
期刊：
影响因子：
10.9
通讯作者：
Yi Huang
中科院分区：
文献类型：
--
作者：
Tengfei Zhang;Fan Zhang;Long Zhang;Yanhong Lu;Yi Zhang;Xi Yang;Yanfeng Ma;Yi Huang
为了满足储能单元的更高要求，迫切需要结合超级电容器的高功率性能和锂离子电池的高能量密度的新型器件。本文设计并制造了一种锂离子电容器装置，该装置由作为正极的电化学双层电容电极和作为负极的锂离子电池型电极组成。两种电极均由石墨烯基活性材料组成：正极采用具有超高比表面积、合适的孔径分布和优异导电性的三维石墨烯基多孔碳材料，负极采用具有开孔结构和优异倍率性能的闪蒸还原氧化石墨烯。借助锂离子电容器结构，该器件表现出全面优异的电化学性能，包括高工作电压（4.2 V）、超高能量密度148.3 Wh kg−1（功率密度为141 W kg−1）、最大功率密度7800 W kg−1（能量密度保持在71.5 Wh kg−1）和长循环寿命。如此优异的性能表明，锂离子电容器可能是一种有前途的新型储能器件，可广泛应用于快速、高效和长寿命的储能系统中。
To meet the higher requirement of energy storage units, novel devices combining high power performance of supercapacitor and high energy density of Li-ion battery are in urgent demand. Herein we designed and fabricated a Li-ion capacitor device, which is composed of an electrochemical double layer capacitance electrode as the positive electrode and a Li-ion battery type electrode as the negative electrode. Both electrodes consist of graphene-based active materials: a three-dimensional graphene-based porous carbon material with ultrahigh specific surface area, appropriate pore size distribution and excellent conductivity for the positive electrode, and a flash-reduced graphene oxide with open-pore structure and superior rate capability for the negative electrode. With the benefit of the Li-ion capacitor structure, the device exhibits a comprehensive and excellent electrochemical performance in terms of high operating voltage (4.2 V), ultrahigh energy density of 148.3 Wh kg−1(with power density of 141 W kg−1), maximum power density of 7800 W kg−1(with energy density kept at 71.5 Wh kg−1) and long cycle life. Such a superior performance indicates that the Li-ion capacitor could be a promising novel energy storage device for wide applications in fast, high efficient and long life energy storage systems.