Title

Study on Novel Electrolyte Additives as SEI– and CEI–forming for Thermally Robust LiNi0.8Co0.1Mn0.1O2/Graphite Lithium–ion Batteries

Alternative Title

상용화 전지 (NCM811/graphite)의 열적 안성성을 높이는 신규 전해질 첨가제에 관한 연구

DGIST Authors

Jong Won Park ; Hochun Lee ; Yong Min Lee

Advisor

이호춘

Co-Advisor(s)

Yong Min Lee

Issued Date

2023

Awarded Date

2023-08-01

Citation

Jong Won Park. (2023). Study on Novel Electrolyte Additives as SEI– and CEI–forming for Thermally Robust LiNi0.8Co0.1Mn0.1O2/Graphite Lithium–ion Batteries. doi: 10.22677/THESIS.200000688220

Type

Thesis

Description

Lithium-ion batteries; Cathode electrolyte interphase; Solid electrolyte interphase; Lithium difluo-ro(fluoromalonato)borate; Lithium tetrafluoro(fluoromalonato)phosphate; Lithium hexafluorostannate

Table Of Contents

Ⅰ. INTRODUCTION 1
Ⅱ. THEORY 8
2.1 Electrochemistry 8
2.1.1 Electromotive Force 8
2.1.2 Electrode Potential 8
2.1.3 Energy Storage 9
2.2 Battery Theory 10
2.4 Lithium-ion Batteries (LIBs) 11
2.4.1 Anode Materials 12
2.4.2 Electrolytes 13
2.4.3 Solid Electrolyte Interphase (SEI) 14
2.4.4 Additives 15
2.4.5 Cathode Materials 15
2.5 References 17
Ⅲ. Malonatophosphate as an SEI- and CEI-forming additive that outperforms malonatoborate for thermally robust lithium-ion batteries 18
3.1 Introduction 18
3.2 Experimental 20
3.2.1 Chemicals 20
3.2.2 Electrochemical measurements 20
3.2.3 Material characterization 21
3.2.4 Density functional theory (DFT) calculations 22
3.3 Results and discussion 23
3.3.1 SEI and CEI layer formation on NCM811 cathodes and graphite anodes 23
3.3.2 Electrochemical performances of NCM811/graphite cells 27
3.3.3 Surface analysis of NCM811 cathodes 36
3.3.4 Surface analysis of graphite anodes 42
3.3.5 Theoretical study on the roles of LFMB and LFMP additives 46
3.4 Conclusions 53
3.5 References 54
Ⅳ. Hexafluorostannate as an SEI- and CEI-forming additive with enhanced thermal stability for LiNi0.8Co0.1Mn0.1O2/Graphite lithium-ion batterie 60
4.1 Introduction 60
4.2 Experimental 61
4.2.1 Chemicals 61
4.2.2 Electrochemical measurements 61
4.2.3 Material characterization 63
4.2.4 Density functional theory (DFT) calculations 63
4.3 Results and discussion 64
4.3.1 SEI and CEI layer formation on NCM811 cathodes and graphite anodes 64
4.3.2 Electrochemical performances of NCM811/graphite cells 66
4.3.3 Surface analysis of NCM811 cathodes 72
4.3.4 Surface analysis of graphite anodes 76
4.3.5 Theoretical study on the roles of Li2SnF6 additive 80
4.4 Conclusions 81
4.5 References 82
Summary (in Korean) 85

URI

http://hdl.handle.net/20.500.11750/46402
http://dgist.dcollection.net/common/orgView/200000688220

DOI

10.22677/THESIS.200000688220

Degree

Doctor

Department

Department of Energy Science and Engineering

Publisher

DGIST

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