Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Comparison of Arrhenius and VTF Description of Ion Transport Mechanism in the Electrolytes

전해질 이온이동 기작 기술을 위한 아레니우스 모델 및 VTF 모델 비교

  • Received : 2020.07.29
  • Accepted : 2020.11.23
  • Published : 2020.11.30
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Abstract

To understand the performance of the electrochemical device, the analysis of the mechanism of ionic conduction is important. However, due to the ionic interaction in the electrolyte and the complexity of the electrolyte structure, a clear analysis method of the ion conduction mechanism has not been proposed. Instead, a variety of mathematical models have been devised to explain the mechanism of ion conduction, and this review introduces the Arrhenius and Vogel-Tammann-Fulcher (VTF) model. In general, the above two mathematical models are used to describe the temperature dependence of the transport properties of electrolytes such as ionic conductivity, diffusion coefficient, and viscosity, and a suitable model can be determined through the linearity of the graph consisting of the logarithm of the moving property and the reciprocal of the temperature. Currently, many electrolyte studies are evaluating the suitability of the above two models for electrolytes by varying the composition and temperature range, and the ion conduction mechanism analysis and activation energy calculation are in progress. However, since there are no models that can accurately describe the transport properties of electrolytes, new models and improvement of existing models are needed.

전기화학 소자의 성능을 이해하는 데 있어서 전해질 내 이온 전도 기작을 이해하는 것은 매우 중요하다. 그러나 이론적/실험적 어려움으로 인해 아직 완벽한 전해질 내 이온 전도 기작 분석법은 정립되지 못했다. 대신 이온 전도 기작을 기술하기 위한 몇 가지 수학적 모델이 고안되었으며, 본 총설에서는 대표적인 사례인 아레니우스(Arrhenius) 모델과 Vogel-Tammann-Fulcher(VTF) 모델을 소개한다. 일반적으로 이 두 모델은 이온 전도도, 확산 계수, 점도와 같은 이동 특성(transport properties)의 온도 의존성을 기술하는 데 사용되며, 주어진 전해질에 적합한 수학적 모델은 이동 물성의 로그 값과 온도의 역수가 이루는 그래프의 선형성을 통해 판별할 수 있다. 현재 많은 전해질 연구는 다양한 조성과 온도 범위에서 두 모델 중에서 더 적합한 모델을 선정하고, 이를 통해 이온 전도 기작 분석과 활성화 에너지를 도출한다. 향후 전해질 이동 특성을 더욱 정확하게 기술할 수 있는 모델의 개발이 필요하다.

Keywords

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