نبذة مختصرة : 학위논문 (석사)-- 서울대학교 대학원 : 화학생물공학부, 2017. 2. 이종찬. ; Solid polymer electrolytes (SPEs) based on polysiloxane having ion-conducting poly(ethylene oxide) (PEO) groups crosslinked with modified gallic acid from natural resources were prepared by thiol-ene click reaction for all-solid-state lithium-sulfur batteries. The effects of crosslinking density on thermal/mechanical and electrochemical properties were systematically studied. SPEs were found to be thermally and mechanically stable even at elevated temperature due to formation of stable crosslinked polymer network by modified gallic acid crosslinker. Furthermore, SPE based on 80 mol% of PEO group and 20 mol% of modified gallic acid crosslinker exhibited high ionic conductivity comparable to that of waxy polymer electrolyte having only the PEO group without crosslinking. All-solid-state lithium-sulfur battery was fabricated by preparing SPE integrated sulfur cathode and it is expected that SPE can act as mechanical and chemical barrier against dissolution of lithium polysulfides, resulting in excellent cycle performance at high temperature. ; 1. Introduction 1 2. Experimental 6 2.1. Materials 6 2.2. Synthesis of branched polysiloxane having thiol group (BPT 7 2.3. Synthesis of allyl poly(ethylene oxide) (allyl PEO) 10 2.4. Synthesis of allyl gallic acid (allyl GA) 11 2.5. Preparation of solid polymer electrolytes (SPEs): A-BPTPs 12 2.6. Synthesis of branched polysiloxane having PEO side chains (BPTP100) 15 2.7. Cell fabrication and electrochemical characterization 16 2.8. Characterization 18 3. Results and Discussion 21 3.1. Synthesis and preparation of components in SPEs 21 3.2. Thermal, mechanical, and electrochemical stabilities 31 3.3. Ion conduction property 35 3.4. Electrochemical and interfacial compatibility with electrodes 38 3.5. Preparation of all-solid-state lithium-sulfur battery 42 4. Conclusions 45 5. References 46 6. Abstract in Korean 49 ; Master
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