Title

Synthesis, structural and electrochemical characterization of new solid electrolytes Li4-xGe1-xSbxS4 and Li5-xAlS4-xClx for all-solid-state batteries

Alternative Title

전고체전지용 새로운 고체전해질 Li4-xGe1-xSbxS4와 Li5-xAlS4-xClx의 합성, 구조 및 전기화학적 특성에 대한 연구

DGIST Authors

Jihun Roh ; Seung-Tae Hong ; Hochun Lee

Advisor

홍승태

Co-Advisor(s)

Hochun Lee

Issued Date

2022

Awarded Date

2022/08

Citation

Jihun Roh. (2022). Synthesis, structural and electrochemical characterization of new solid electrolytes Li4-xGe1-xSbxS4 and Li5-xAlS4-xClx for all-solid-state batteries. doi: 10.22677/thesis.200000629297

Type

Thesis

Subject

Solid-state batteries, solid electrolyte, air-stability, ionic conductivity, X-ray diffraction, exploratory synthesis

Description

Solid-state batteries, solid electrolyte, air-stability, ionic conductivity, X-ray diffraction, exploratory synthesis

Abstract

Table Of Contents

1. Motivation 1
1.1. Why all-solid-state batteries 1
1.2. Discovery of new materials 2
1.3. Introduction to Li4-xGe1-xSbxS4 4
1.4. Introduction to Li5-xAlS4-xClx 7
2. Experimental 9
2.1. Synthesis 9
2.1.1. Synthesis of Li4-xGe1-xSbxS4 9
2.1.2. Synthesis of Li5-xAlS4-xClx 11
2.2, Material characterization 11
2.2.1. Powder Xr-ay diffraction 11
2.2.2. Electrochemical analysis 12
2.2.3. Bond valence sum calculation of Li4-xGe1-xSbxS4 13
2.2.4. DFT-calculation of Li5-xAlS4-xClx 13
3. Results and discussions 15
3.1. Results of Li4-xGe1-xSbxS4 15
3.1.1. Structural analysis 15
3.1.2. Li+-transport 28
3.1.3. Dry-air stability 30
3.1.4. Charge/discharge profile 32
3.2. Results of Li5-xAlS4-xClx 36
3.2.1. Structural analysis 36
3.2.2. Li+-transport properties 49
3.2.3. DFT calculation 51
4. Conclusion 54
5. References 56

URI

http://dgist.dcollection.net/common/orgView/200000629297
http://hdl.handle.net/20.500.11750/16790

DOI

10.22677/thesis.200000629297

Degree

Master

Department

Department of Energy Science and Engineering

Publisher

DGIST

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