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Densified Laser-Induced Graphene for Flexible Microsupercapacitors

Author

Listed:
  • Jung Bae Lee

    (Soft Energy Systems and Laser Applications Laboratory, School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea)

  • Jina Jang

    (Soft Energy Systems and Laser Applications Laboratory, School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea)

  • Haoyu Zhou

    (Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06974, Korea)

  • Yoonjae Lee

    (Soft Energy Systems and Laser Applications Laboratory, School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea)

  • Jung Bin In

    (Soft Energy Systems and Laser Applications Laboratory, School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea
    Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06974, Korea)

Abstract

Microsupercapacitors have attracted significant attention due to several of their advantageous characteristics such as lightweight, small volume, and planar structure that is favorable for high mechanical flexibility. Among the various micro supercapacitor forms, those with laser-induced graphene (LIG) electrodes are promising as flexible energy storage devices. While LIG microelectrodes can be fabricated simply by direct laser writing, the capacitance and energy density of these devices are limited because of the relatively low density of LIG, which leads to low surface areas. These limitations could be overcome by densifying the LIG. Here, we report the use of densified laser-induced graphene (d-LIG) to fabricate flexible micro supercapacitors. Interdigitated d-LIG electrodes were prepared by duplicate laser pyrolysis of a polyimide sheet by using a CO 2 laser. A PVA-H 2 SO 4 gel-type electrolyte was then applied to the d-LIG electrode surface to assemble a d-LIG micro supercapacitor. This d-LIG micro supercapacitor exhibited substantially increased capacitance and energy density versus conventional low-density LIG micro supercapacitors. While the d-LIG electrode exhibited a substantial change in resistance when subjected to bending at a radius of 3 mm, the change in the capacitance of the d-LIG micro supercapacitor was negligible at the same bending radius due to reinforcement by the infiltrated poly(vinyl alcohol) (PVA) electrolyte, demonstrating the potential application of d-LIG micro supercapacitors in wearable electronics.

Suggested Citation

  • Jung Bae Lee & Jina Jang & Haoyu Zhou & Yoonjae Lee & Jung Bin In, 2020. "Densified Laser-Induced Graphene for Flexible Microsupercapacitors," Energies, MDPI, vol. 13(24), pages 1-9, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6567-:d:461320
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    References listed on IDEAS

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    1. Lu-Qi Tao & He Tian & Ying Liu & Zhen-Yi Ju & Yu Pang & Yuan-Quan Chen & Dan-Yang Wang & Xiang-Guang Tian & Jun-Chao Yan & Ning-Qin Deng & Yi Yang & Tian-Ling Ren, 2017. "An intelligent artificial throat with sound-sensing ability based on laser induced graphene," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    2. Jian Lin & Zhiwei Peng & Yuanyue Liu & Francisco Ruiz-Zepeda & Ruquan Ye & Errol L. G. Samuel & Miguel Jose Yacaman & Boris I. Yakobson & James M. Tour, 2014. "Laser-induced porous graphene films from commercial polymers," Nature Communications, Nature, vol. 5(1), pages 1-8, December.
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