Study on Novel Electrolyte Additives as SEI– and CEI–forming for Thermally Robust LiNi0.8Co0.1Mn0.1O2/Graphite Lithium–ion Batteries
- 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
- Author(s)
- Jong Won Park
- 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
- 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
- Degree
- Doctor
- Department
- Department of Energy Science and Engineering
- Publisher
- DGIST
- Related Researcher
-
-
Lee, Hochun
- 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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- Appears in Collections:
- Department of Energy Science and Engineering Theses Ph.D.
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