Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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PEO/PPC based Composite Solid Electrolyte for Room Temperature Operable All Solid-State Batteries

상온에서 작동되는 전고체전지 용 PEO/PPC 기반의 복합 고체 전해질

  • Shin, Sohyeon (Department of Energy Systems Engineering, Soon Chun Hyang University) ;
  • Kim, Sunghoon (Department of Energy Systems Engineering, Soon Chun Hyang University) ;
  • Cho, Younghyun (Department of Energy Systems Engineering, Soon Chun Hyang University) ;
  • Ahn, Wook (Department of Energy Systems Engineering, Soon Chun Hyang University)
  • 신소현 (순천향대학교에너지시스템학과) ;
  • 김성훈 (순천향대학교에너지시스템학과) ;
  • 조용현 (순천향대학교에너지시스템학과) ;
  • 안욱 (순천향대학교에너지시스템학과)
  • Received : 2022.04.28
  • Accepted : 2022.06.22
  • Published : 2022.08.31
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Abstract

For the commercialization of all-solid-state batteries, it is essential to develop a solid electrolyte that can be operable at room temperature, and it is necessary to manufacture all-solid-state batteries by adopting materials with high ionic conductivity. Therefore, in order to increase the ionic conductivity of the existing oxide-based solid, Li7La3Zr2O12 (LLZO) doped with heterogeneous elements was used as a filler material (Al and Nb-LLZO). An electrolyte with garnet-type inorganic filler doped was prepared. The binary metal element and the polymer mixture of poly(ethylene oxide)/poly(propylene carbonate) (PEO/PPC) (1:1) are uniformly manufactured at a ratio of 1:2.4, The electrochemical performance was tested at room temperature and 60 ℃ to verify room temperature operability of the all-solid-state battery. The prepared composite electrolyte shows improved ionic conductivity derived from co-doping of the binary elements, and the PPC helps to improve the ionic conductivity, thereby increasing the capacity of all-solid-state batteries at room temperature as well as 60 ℃. It was confirmed that the capacity retention rate was improved.

전고체전지의 상용화를 위해서는 상온에서 작동이 가능한 고체전해질 개발이 필수적이며 이온전도도가 높은 물질을 채택하여 전고체전지를 제조해야 한다. 따라서, 기존의 옥사이드 계열의 고체의 이온전도도를 높이기 위하여 이종원소가 도핑된 Li7La3Zr2O12 (LLZO)를 필러소재(Al, Nb-LLZO)로 사용하였으며, 상온에서 작동이 가능하도록 Poly(ethylene oxide)/Poly(propylene carbonate) (PEO/PPC) 기반의 가넷형 무기계 고체고분자 전해질을 제조하였다. 이원금속 원소를 도핑한 가넷형 무기계 필러와 PEO/PPC (1:1 비율로 섞인) 고분자를 1:2.4의 비율로 균일하게 교반하여 전해질을 합성해 상온과 60 ℃에서 전고체 전지의 전기학적 성능을 분석하였다. 제조한 복합 전해질은 이원금속의 도핑으로 인하여 이온전도도가 향상되었으며, PEO 단독으로 사용하는 전해질보다 PPC를 1:1로 첨가하였을 때 이온전도도 향상을 도와 60 ℃ 뿐만 아니라 상온에서 전고체 전지의 용량과 용량 유지율이 개선되었음을 확인하였다.

Keywords

Acknowledgement

This result was supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (2021RIS-004), and also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2020R1C1C1010493).

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