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The Membrane Society of Korea (한국막학회)
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Nanostructured PVdF-HFP/TiO2 Composite as Protective Layer on Lithium Metal Battery Anode with Enhanced Electrochemical Performance

PVdF-HFP/TiO2 나노복합체 보호층을 통한 리튬금속전지 음극의 전기화학적 성능 향상

  • Lee, Sanghyun (Department of Chemical Engineering, Kwangwoon University) ;
  • Choi, Sang-Seok (Department of Chemical Engineering, Kwangwoon University) ;
  • Kim, Dong-Eun (Department of Chemical Engineering, Kwangwoon University) ;
  • Hyun, Jun-Heock (Department of Chemical Engineering, Kwangwoon University) ;
  • Park, Young-Wook (Department of Chemical Engineering, Kwangwoon University) ;
  • Yu, Jin-Seong (Department of Chemical Engineering, Kwangwoon University) ;
  • Jeon, So-Yoon (Department of Chemical Engineering, Kwangwoon University) ;
  • Park, Joongwon (Department of Chemical Engineering, Kwangwoon University) ;
  • Shin, Weon Ho (Department of Chemical Engineering, Kwangwoon University) ;
  • Sohn, Hiesang (Department of Chemical Engineering, Kwangwoon University)
  • 이상현 (광운대학교 화학공학과) ;
  • 최상석 (광운대학교 화학공학과) ;
  • 김동언 (광운대학교 화학공학과) ;
  • 현준혁 (광운대학교 화학공학과) ;
  • 박용욱 (광운대학교 화학공학과) ;
  • 유진성 (광운대학교 화학공학과) ;
  • 전소윤 (광운대학교 화학공학과) ;
  • 박중원 (광운대학교 화학공학과) ;
  • 신원호 (광운대학교 화학공학과) ;
  • 손희상 (광운대학교 화학공학과)
  • Received : 2021.11.29
  • Accepted : 2021.12.02
  • Published : 2021.12.31
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Abstract

As the demand for high-capacity batteries increases, there has been growing researches on the lithium metal anode with a capacity (3,860 mAh/g) of higher than that of conventional one and a low electrochemical potential (-3.040 V). In this study, using the anatase phased TiO2 nanoparticles synthesized by hydrothermal synthesis, a PVdF-HFP/TiO2 organic/inorganic composite material was designed and used as an interfacial protective layer for a Li metal anode. As-formed organic/inorganic-lithium composite thin film was confirmed through the crystalline structure and morphological analyses. In addition, the electrochemical test (cycle stability and voltage profile) confirmed that the protective layer of PVdF-HFP/TiO2 composite (10 wt% TiO2 and 1.1 ㎛ film thickness) contributed to the enhanced electrochemical performance of the lithium metal anode (Colombic efficiency retention: 90% for 77 cycles). Based on comparative test with the untreated lithium electrode, it was confirmed that our protective layer plays an important role to stabilize/improve the EC performance of the lithium metal negative electrode.

고용량 배터리에 대한 요구가 증가에 따라 기존 음극재보다 높은 용량(3,860 mAh/g)과 낮은 전기화학적 전위(-3.040 V)를 갖는 리튬 금속 기반 음극재에 대한 연구가 활발하게 이루어지고 있다. 본 연구에서는 수열 합성을 통해 제작된 아나타제(anatase) 타입의 TiO2 나노 입자 기반한 PVdF-HFP/TiO2 복합체를 리튬 금속 음극의 계면 보호층으로 적용하였다. 결정구조 및 형상 분석을 통해 유/무기-리튬 나노복합체 박막의 형성을 확인하였다. 또한, 전지화학 테스트(사이클 테스트 및 전압 프로파일)를 통해 리튬 금속 음극의 전기화학 성능 은 복합체 보호막이 TiO2 10 wt%, 코팅 두께 1.1 ㎛의 조건에서 가장 개선된 전기화학적 성능(콜롱 효율 유지: 77 사이클 동안 90% 이상) 발현을 확인하였다. 이를 통해, 처리하지 않은 리튬 전극 대비 본 보호층에 의한 리튬 금속 음극의 성능 안정화/개선 효과가 검증되었다.

Keywords

Acknowledgement

The present research has been conducted by the Research Grant of Kwangwoon University in 2020. This research was supported by the Nano-Material Technology Development Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT and Future Planning (2009-0082580). It was also supported by an NRF grant funded by the Korean government (MSIT) (No. NRF-2020R1F1A1065536) and by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0012451, The Competency Development Program for Industy Specialist).

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