Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Controlling Defects in Graphene Film for Enhanced-Quality Current Collector of Zinc-Ion Batteries with High Performance

고성능 아연-이온 전지의 고품질 집전체를 위한 그래핀 필름의 결함 제어

  • Young-Geun Lee (Department of Energy Engineering, Gyeongsang National University) ;
  • Geon-Hyoung An (Department of Energy System Engineering, Gyeongsang National University)
  • 이영근 (경상국립대학교 에너지공학과) ;
  • 안건형 (경상국립대학교 에너지시스템공학과)
  • Received : 2023.02.21
  • Accepted : 2023.03.30
  • Published : 2023.04.27
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Abstract

Zinc-ion Batteries (ZIBs) are currently considered to be effective energy storage devices for wearable electronics because of their low cost and high safety. Indeed, ZIBs show high power density and safety compared with conventional lithium ion batteries (LIBs) and exhibit high energy density in comparison with supercapacitors (SCs). However, in spite of their advantages, further current collector development is needed to enhance the electrochemical performance of ZIBs. To design the optimized current collector for high performance ZIBs, a high quality graphene film is suggested here, with improved electrical conductivity by controlling the defects in the graphene film. The graphene film showed improved electrical conductivity and good electron transfer between the current collector and active material, which led to a high specific capacity of 346.3 mAh g-1 at a current density of 100 mA g-1, a high-rate performance with 116.3 mAh g-1 at a current density of 2,000 mA g-1, and good cycling stability (68.0 % after 100 cycles at a current density of 1,000 mA g-1). The improved electrochemical performance is firmly because of the defects-controlled graphene film, leading to improved electrical conductivity and thus more efficient electron transfer between the current collector and active material.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2020R1C1C1010611). This work was supported by the research grant of the Gyeongsang National University in 2022.

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