Study on the enhancement of the interfacial properties between lithium metal electrode and polymer electrolyte = 리튬금속 전극과 고분자 전해질의 계면특성 향상에 관한 연구

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Lithium metal polymer batteries (LMPB) are expected to achieve a high energy density due to a high specific capacity of the lithium metal anode. However, the performance of LMPB was restricted by the following problems. High chemical or electrochemical reactivity of the metallic lithium electrode with the electrolyte leads to the capacity loss by the consumption of electrolyte and the interfacial resistance by the growth of SEI (Solid Electrolyte Interphase) layer. The dendritic lithium, which produces the internal short-circuit of the battery, is also formed due to the non-uniform current distribution of the lithium metal electrode. These problems of the metallic lithium electrode need to be solved for the realization of the lithium metal polymer batteries. Therefore, it is quite important to control the lithium electrode-polymer electrolyte interface. In this study, the ideas for the improvement of electrochemical properties at polymer electrolyte-the metallic lithium electrode interface were proposed and its effects were carefully discussed. The interfacial properties between the gel polymer electrolyte and the lithium metal electrode were strongly dependent on the matrix structure. When the poly(vinylacetate) (PVAc) showing good compatibility with the liquid electrolyte was introduced into the gel polymer electrolyte based on P(VdF-co-HFP), the initial interfacial resistance and the interfacial stability was enhanced owing to the improvement of the physical contact with the lithium metal electrode and the reduction of the leakage behavior of liquid electrolyte from the gel polymer electrolyte. To overcome the deterioration of the mechanical strength for the gel polymer electrolyte by introducing PVAc component, the protective thin layer based on the crosslinked gel polymer electrolyte was designed and introduced on the surface of lithium metal by in-situ photopolymerization. The protective thin layer consisted of the crosslinking agent (1,6-Hexanediol dic...
Advisors
Park, Jung-Kiresearcher박정기researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
237615/325007  / 020005320
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2004.2, [ xiii, 135 p. ]

Keywords

LITHIUM METAL POLYMER SECONDARY BATTERY; CROSSLINKED PROTECTION LAYER; POLYMER ELECTROLYTE; LITHIUM METAL ELECTRODE; ANION RECEPTOR; 음이온 고정화 물질; 리튬금속 고분자 이차전지; 가교보호막층; 고분자 전해질; 리튬금속 전극

URI
http://hdl.handle.net/10203/28923
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=237615&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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