Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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High Temperature Supercapacitor with Free Standing Quasi-solid Composite Electrolytes

독립형 반고체 복합 전해질을 적용한 고온 수퍼커패시터

  • Kim, Dong Won (Department of Energy Engineering, Gyeongnam National University of Science and Technology) ;
  • Jung, Hyunyoung (Department of Energy Engineering, Gyeongnam National University of Science and Technology)
  • 김동원 (국립경남과학기술대학교 에너지공학과) ;
  • 정현영 (국립경남과학기술대학교 에너지공학과)
  • Received : 2018.11.16
  • Accepted : 2019.01.21
  • Published : 2019.02.27
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Abstract

Supercapacitors are attracting much attention in sensor, military and space applications due to their excellent thermal stability and non-explosion. The ionic liquid is more thermally stable than other electrolytes and can be used as a high temperature electrolyte, but it is not easy to realize a high temperature energy device because the separator shrinks at high temperature. Here, we report a study on electrochemical supercapacitors using a composite electrolyte film that does not require a separator. The composite electrolyte is composed of thermoplastic polyurethane, ionic liquid and fumed silica nanoparticles, and it acts as a separator as well as an electrolyte. The silica nanoparticles at the optimum mass concentration of 4wt% increase the ionic conductivity of the composite electrolyte and shows a low interfacial resistance. The 5 wt% polyurethane in the composite electrolyte exhibits excellent electrochemical properties. At $175^{\circ}C$, the capacitance of the supercapacitor using our free standing composite electrolyte is 220 F/g, which is 25 times higher than that at room temperature. This study has many potential applications in the electrolyte of next generation energy storage devices.

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References

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