High-Performance Hybrid Supercapacitor Based on Graphene-Wrapped Li4Ti5O12 and Activated Carbon

Authors

  • Haegyeom Kim,

    1. Department of Material Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul (Republic of Korea)
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  • Kyu-Young Park,

    1. Department of Material Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul (Republic of Korea)
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  • Min-Young Cho,

    1. Korea Institute of Ceramic Engineering and Technology (KICET), 233-5 Gasan-dong, Guemcheon-gu, Seoul (Republic of Korea)
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  • Mok-Hwa Kim,

    1. Korea Institute of Ceramic Engineering and Technology (KICET), 233-5 Gasan-dong, Guemcheon-gu, Seoul (Republic of Korea)
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  • Jihyun Hong,

    1. Department of Material Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul (Republic of Korea)
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  • Sung-Kyun Jung,

    1. Department of Material Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul (Republic of Korea)
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  • Dr. Kwang Chul Roh,

    1. Korea Institute of Ceramic Engineering and Technology (KICET), 233-5 Gasan-dong, Guemcheon-gu, Seoul (Republic of Korea)
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  • Prof. Kisuk Kang

    Corresponding author
    1. Department of Material Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul (Republic of Korea)
    2. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, Seoul 151-742 (Republic of Korea)
    • Department of Material Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul (Republic of Korea)===

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Abstract

Hybridizing battery and supercapacitor technologies have the potential to overcome the limitations of the currently prevailing energy-storage systems. Combining high-power capacitive electrodes from supercapacitors with the high-energy intercalation electrodes in lithium-ion batteries provides the opportunity to create a single device that can deliver both high energy and high power. Although energy densities in such hybrid systems easily exceed those found in supercapacitors, the kinetic imbalance between capacitive and intercalation electrodes remains a bottleneck to achieving the desired performance. This imbalance is eliminated through the use of graphene-wrapped Li4Ti5O12 from a simple, one-step process as a high-power anode in a new hybrid supercapacitor. The new hybrid supercapacitors are capable of delivering a high specific energy of up to 50 Wh kg−1 and can even maintain an energy of approximately 15 Wh kg−1 at a 20 s charge/discharge rate.

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