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The Membrane Society of Korea (한국막학회)
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Polymer/Inorganic Nanohybrid Membrane on Lithium Metal Electrode: Effective Control of Surficial Growth of Lithium Layer and Its Improved Electrochemical Performance

리튬 금속 전극상 고분자/무기물 나노복합막 형성: 리튬층의 효과적 표면성장 제어 및 전기화학적 특성 향상

  • Jeong, Yohan (Department of Chemical Engineering, Kwangwoon University) ;
  • Seok, Dohyeong (Department of Chemical Engineering, Kwangwoon University) ;
  • Lee, Sanghyun (Department of Chemical Engineering, Kwangwoon University) ;
  • Shin, Weon Ho (Department of Electronic Material Engineering, Kwangwoon University) ;
  • Sohn, Hiesang (Department of Chemical Engineering, Kwangwoon University)
  • 정요한 (광운대학교 화학공학과) ;
  • 석도형 (광운대학교 화학공학과) ;
  • 이상현 (광운대학교 화학공학과) ;
  • 신원호 (광운대학교 전자재료공학과) ;
  • 손희상 (광운대학교 화학공학과)
  • Received : 2020.01.15
  • Accepted : 2020.01.27
  • Published : 2020.02.29
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Abstract

Polymer/inorganic composites were used as a protective layer of lihitum metal electrode for effective suppression of lithium dendrite. PVDF-HFP was used as an polymer material and TiO2 nanoparticle was used as an inorganic material. PVDF-HFP is a highly flexible polymer that acts as a matrix of inorganic materials while TiO2 nanoparticle improves the mechanical strength and ion conductivity of the protective layer. The as-synthesized protective hybrid membrane exhibited good dispersion of TiO2 in the PVDF-HFP matrix by SEM, AFM and XRD analyses. Furthermore, the electrochemical analysis showed that the polymer-inorganic composite retained high coulombic efficiency of 80% and low overpotential, less than 20 mV until the 100th cycles due to the improved mechanical properties and ion conductivity in comparison to the control sample (untreated and PVDF-HFP polymers/Cu).

리튬 덴드라이트의 효과적인 억제를 위해 유/무기 복합체를 리튬메탈 전극의 보호층으로 사용하였다. 유기물로는 PVDF-HFP가 사용되었으며 무기물로는 TiO2가 사용되었다. 유기물로 사용된 PVDF-HFP는 높은 유연성을 가지는 고분자로서 무기물의 matrix 역할을 하며, 무기물로 사용된 TiO2 나노입자는 보호막의 기계적 강도와 이온전도성을 향상시켜주는 역할을 하였다. 합성된 보호막은 SEM, AFM, XRD를 통하여 PVDF-HFP matrix에 TiO2가 잘 분산되어 있는 형태인 것을 확인할 수 있었다. 또한 전기화학적 분석 결과, 향상된 기계적 물성과 이온전도성으로 인해 polymer-inorganic composite은 비교 샘플(untreated 와 PVDF-HFP 보호층) 대비 100번째 사이클까지 80%의 높은 쿨롱 효율 및 20 mV 미만의 낮은 과전압을 나타내었다.

Keywords

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