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Quantitative Analysis of Solid-State Energy Devices via 3D Reconstruction using A FIB/SEM Dual Beam System

Quantitative Analysis of Solid-State Energy Devices via 3D Reconstruction using A FIB/SEM Dual Beam System
Bae, Kyung Taek
DGIST Authors
Bae, Kyung Taek; Lee, Hochun; Lee, Kang Ta다
Lee, Kang Ta다
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고체산화물 연료전지, 전고체베터리, 3차원 재구성, 정량화
The 3D reconstruction of solid-state energy devices, solid oxide fuel cells (SOFCs) and all-solid-state lithium ion batteries (ASSLIBs) has been widely utilized to analyze their complex and porous electrodes microstructure in three dimensions and quantify microstructural specificity. The microstructural characteristic of their electrodes which support the electrochemical reaction play an important role in determining the performance and durability of these devices. In order to meet the performance and stability demands of various applications, it is essential to understand the evolution of microstructures at the cell and electrodes level, which are considered important aspects that affect device life and performance. Focused ion beam/scanning electron microscope (FIB/SEM) dual beam system has an adequate scale and high spatial resolution to represent the microstructural characteristics of the solid-state energy device electrodes. In this thesis, first, SOFCs electrode (Ni-YSZ anode and LSCF-GDC cathode) were quantified by the 3D reconstruction technique using FIB/SEM dual beam system. Various microstructure parameters were quantified such as volume fraction, particle size diameter, specific surface area and triple phase boundary. In particular, the electrochemically active TPB was successfully distinguished. It directly affects the electrode performance. Comparative studies were carried out by using quantified microstructural features. Second, interfacial contact area of all-solid-state lithium battery (ASSLB) electrode with solid oxide electrolytes were precisely quantified and discussed to unravel the intrinsic limitations of solid oxide electrolytes. Thus these in-depth analysis data can be used for designing materials and optimizing electrode design parameters for ASSLBs
Table Of Contents
Abstract ·································································································· i List of contents ························································································· ii List of tables ··························································································· iii List of figures·························································································· vi Ⅰ. INTRODUCTION Ⅱ. BACKGROUND INFORMATION 2.1 SOLID OXIDE FUEL CELL ······························································ 4 2.1.1 Electrochemical performance ······················································· 5 2.2 ALL SOILID-STATE LITHION ION BATTERY ····································· 6 2.3 FOCUSED ION BEAM – SCANNING ELECTRON MICROSCOPY ············· 6 Ⅲ. THREE-DIMENSIONAL MORPHOLOGICAL ANALYSIS OF SOFC ELECTRODES COMBINED WITH IMPEDANCE SPECTROSCOPY 3.1 INTRODUCTION ·········································································· 14 3.2 EXPERIMENTAL PROCEDURE ······················································· 15 3.3 RESULT AND DISCUSSION ···························································· 15 3.3.1 Ni-YSZ anode support layer ················································ 16 3.3.2 LSCF-GDC cathode support layer ········································ 18 3.4 CONCLUSION·············································································· 19 Ⅳ. UNRAVELING LIMITATION OF SOLID OXIDE ELECTROLYTE FOR ALL-SOLID-STATE LITHIUM ION BATTERY ELECTRODE BASED ON 3D RECONSTRUCTION STRUCTURE 4.1 INTRODUCTION ·········································································· 29 4.2 EXPERIMENTAL PROCEDURE ······················································· 31 4.3 RESULT AND DISCUSSION ···························································· 33 4.4 CONCLUSION·············································································· 36 References ······························································································ 47 요약문 ·································································································· 53
Department of Energy Science and Engineering
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
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