Title

Tailoring ionic structures in Locally concentrated ionic liquid electrolytes for safe, stable cycling of high-voltage Li metal batteries

DGIST Authors

Gunyoung Kim ; Hongkyung Lee ; Hochun Lee

Advisor

이홍경

Co-Advisor(s)

Hochun Lee

Issued Date

2023

Awarded Date

2023-02-01

Citation

Gunyoung Kim. (2023). Tailoring ionic structures in Locally concentrated ionic liquid electrolytes for safe, stable cycling of high-voltage Li metal batteries. doi: 10.22677/THESIS.200000657981

Type

Thesis

Description

High voltage Li metal batteries, Locally concentrated ionic liquid electrolyte, Solvation structure, Solid electrolyte interphase

Table Of Contents

Ⅰ. Introduction
1.1 Basic principles of Li secondary batteries 1
1.2. Li-metal Battery 2
1.2.1 Merits of Li-metal anode 2
1.2.2 Challenges of Li-metal Anode 3
1.2.3 Evaluation of Li reversibility 4
1.2.4 Effects of cell parameters and operation conditions 6
1.3 Electrolyte System 7
1.3.1 Basic Concepts of Solvation Chemistry 7
1.3.2 Molecular Dynamics 8
1.3.3 Raman spectroscopy 9
1.4 Electrode-Electrolyte Interphase 10
1.4.1 Solid-Electrolyte Interphase (SEI) 10
1.4.2 Cathode-Electrolyte interphase (CEI) 11
1.5. Research Goals 12

Ⅱ. Experimental Method
2.1. Preparation of Electrode and Electrolytes 14
2.2. Electrochemical measurements 14
2.3. Characterizations 15

Ⅲ. Results and discussion
3.1 Designing LCIL (dilution effects of LCIL) 17
3.2 Ionic liquid’s cation effects in LCIL 29
3.3 Additives in LCIL 36

IV. Concluding Remark 39
References 40
Summary in Korean 46

URI

http://hdl.handle.net/20.500.11750/45727
http://dgist.dcollection.net/common/orgView/200000657981

DOI

10.22677/THESIS.200000657981

Degree

Master

Department

Department of Energy Science and Engineering

Publisher

DGIST

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