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 ℃, 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.

Abstracts
 1. 서 론
 2. 실험방법
  2.1 복합 전해질 제조 및 물성 평가
  2.2 수퍼커패시터의 제작 및 전기화학적 성능 평가
 3. 결과 및 고찰
 4. 결 론
 References

• 김동원(국립경남과학기술대학교 에너지공학과) | Dong Won Kim (Department of Energy Engineering, Gyeongnam National University of Science and Technology)
• 정현영(국립경남과학기술대학교 에너지공학과) | Hyunyoung Jung (Department of Energy Engineering, Gyeongnam National University of Science and Technology) Corresponding author