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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Dependency of electrochemical performances of silicon lithium ion batteries on glycosidic linkages of polysaccharide binders

2016년 2월 25일 15시 48분 28초
ELEC.P-513 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 21일 (목요일) 11:00~12:30
저자 및
황치현*, 송현곤1,*
울산과학기술대학교(UNIST) 에너지공학과, Korea
1울산과학기술대학교(UNIST) 친환경에너지공학부, Korea

Molecular structures of polysaccharide binders determining mechanical properties were correlated to electrochemical performances of silicon anodes for lithium ion batteries. Glycosidic linkages (α and β) and side chains (-COOH and -OH) were selected and proven as the major factors of the molecular structures. Three different single-component polysaccharides were compared: pectin for α-linkages versus carboxylic methyl cellulose (CMC) for β-linkages from the linkage’s standpoint; and pectin as a COOH-containing polymer and amylose as its non-COOH counterpart from the side chain’s standpoint. Pectin was remarkably superior to CMC and amylose in cyclability and rate capability of battery cells based on silicon anodes. The pectin binder allowed volume expansion of silicon electrodes with keeping high porosity during lithiation due to the elastic nature caused by the chair-to-boat conformation in α-linkages of its backbone. Physical integrity of pectin-based electrodes was not challenged during repeated lithiation/delithiation cycles without crack development that was observed in rigid CMC-based electrodes. Covalent bonds formed between carboxylic side chains of pectin and silicon surface oxide prevented active silicon mass from being detached away from electric pathways. However, hydrogen bonds between hydroxyl side chains of amylose and silicon surface oxide were not strong enough to keep silicon mass electrochemically active after cyclability tests.