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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.2 pp.121-128
DOI : https://doi.org/10.3740/MRSK.2019.29.2.121

High Temperature Supercapacitor with Free Standing Quasi-solid Composite Electrolytes

Dong Won Kim,Hyunyoung Jung
Department of Energy Engineering, Gyeongnam National University of Science and Technology, Jinju-si 52725, Republic of Korea
Corresponding author E-Mail : hyjung@gntech.ac.kr (H. Jung, GNTECH)

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 oC, 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.

독립형 반고체 복합 전해질을 적용한 고온 수퍼커패시터

김동원,정현영
국립경남과학기술대학교 에너지공학과

초록

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