Tuning the interlayer spacing of graphene laminate films for efficient pore utilization towards compact capacitive energy storage

Zhuangnan Li, Srinivas Gadipelli, Hucheng Li, Christopher A. Howard, Dan J. L. Brett, Paul R. Shearing, Zhengxiao Guo (), Ivan P. Parkin () and Feng Li ()
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Zhuangnan Li: University College London
Srinivas Gadipelli: University College London
Hucheng Li: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Christopher A. Howard: University College London
Dan J. L. Brett: University College London
Paul R. Shearing: University College London
Zhengxiao Guo: University College London
Ivan P. Parkin: University College London
Feng Li: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences

Nature Energy, 2020, vol. 5, issue 2, 160-168

Abstract: Abstract Supercapacitors have shown extraordinary promise for miniaturized electronics and electric vehicles, but are usually limited by electrodes with rather low volumetric performance, which is largely due to the inefficient utilization of pores in charge storage. Herein, we design a freestanding graphene laminate film electrode with highly efficient pore utilization for compact capacitive energy storage. The interlayer spacing of this film can be precisely adjusted, which enables a tunable porosity. By systematically tailoring the pore size for the electrolyte ions, pores are utilized optimally and thereby the volumetric capacitance is maximized. Consequently, the fabricated supercapacitor delivers a stack volumetric energy density of 88.1 Wh l−1 in an ionic liquid electrolyte, representing a critical breakthrough for optimizing the porosity towards compact energy storage. Moreover, the optimized film electrode is assembled into an ionogel-based, all-solid-state, flexible smart device with multiple optional outputs and superior stability, demonstrating enormous potential as a portable power supply in practical applications.

Date: 2020
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DOI: 10.1038/s41560-020-0560-6

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