DGIST Scholar: Design of Conductive Networks and Interfaces for Thin Lithium Metal Powder Electrodes in Rechargeable Batteries

Department of Energy Science and Engineering Theses Ph.D.

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Design of Conductive Networks and Interfaces for Thin Lithium Metal Powder Electrodes in Rechargeable Batteries

Title: Design of Conductive Networks and Interfaces for Thin Lithium Metal Powder Electrodes in Rechargeable Batteries

Alternative Title: 박막 리튬 금속 분말 음극의 전기전도성 네트워크 및 계면 설계

Author(s): Cyril Bubu Dzakpasu

DGIST Authors: Cyril Bubu Dzakpasu ; Yong Min Lee ; Kang Taek Lee

Advisor: 이용민

Co-Advisor(s): Kang Taek Lee

Issued Date: 2023

Awarded Date: 2023-08-01

Type: Thesis

Description: Li metal powder; Li metal batteries; Li dendrites; Dead Li; Solid electrolyte interphase; Conductive networks; Lithium nitride

Table Of Contents: I. Introduction 1
1.1 Introduction to lithium metal batteries 1
1.2 Challenges of lithium metal batteries 3
1.2.1 Lithium dendrites and dead Li 3
1.2.2 Volume expansion 4
1.3 Strategies to solve the challenging issues of the Li metal anode 5
1.3.1 Solid electrolyte interphase (SEI) 5
1.3.2 Increasing the surface area of the anode 5
1.4 Research objectives and outline 7
1.5 References 9
II. Screening of conductive agents for Li powder composite anode 14
2.1 Background of research 14
2.2 Experimental section 15
2.2.1 Materials 15
2.2.2 Electrode preparation 15
2.2.3 Cell assembly 16
2.2.4 Electrochemical analysis and characterization 16
2.3 Results and discussion 17
2.4 Conclusion 24
2.5 References 25
III. Bifunctional role of carbon nanotubes within Li powder composite anode 28
3.1 Introduction 28
3.2 Experimental section 30
3.2.1 Materials 30
3.2.2 Electrode preparation 30
3.2.3 Cell assembly 30
3.2.4 Electrochemical analysis 31
3.2.5 Characterization and post-mortem analysis 31
3.3 Results and discussion 33
3.4 Conclusion 46
3.5 References 47
IV. Artificial Li3N SEI for stable cycling of Li powder anode in carbonate electrolytes 51
4.1 Introduction 51
4.2 Experimental section 54
4.2.1 Materials 54
4.2.2 Copper hydroxide/nitride nanowires preparation 54
4.2.3 Electrode preparation 55
4.2.4 Copper nitride nanowires-printed LMP preparation 55
4.2.5 Materials characterization and post-mortem analysis 55
4.2.6 Cell assembly 56
4.2.7 Electrochemical analysis 56
4.3 Results and discussion 58
4.4 Conclusion 74
4.5 References 75
Summary in Korean 81