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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Self-assembled Hybrids Comprising Ge Nanoparticles and Polymer Composites for Anode Materials of Advanced Lithium-Polymer Batteries

등록일
2012년 2월 10일 15시 28분 50초
접수번호
0133
발표코드
POLY1-2 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 09시 : 25분
발표형식
심포지엄
발표분야
고분자화학 - Current issues in environment/energy fusion technologies
저자 및
공동저자
박문정
포항공과대학교 화학과, Korea
A facile synthetic route toward binder-free anode materials comprising Ge nanoparticles (GeNPs) and amorphous carbons is developed for high capacity lithium batteries. Confinement of butyl-capped GeNPs (ca. 10 nm) within poly(styrene-b-isoprene) (PS-PI) block copolymer particles is successfully achieved with aid of thermoset polymers. Each PS-PI particle with characteristic size of 120 nm contains 5~8 GeNPs. The internal structure of the composites was locked up by simple thermal curing process and all polymeric materials were turned into carbons by subsequent pyrolysis. The resulting anode contains well-dispersed GeNPs, embedded in carbon matrix and exhibits smooth surface in the absence of binders. It has been revealed that the GeNPs/carbon hybrid anode can deliver high reversible charge capacities of 1600 mAh/g with Coulombic efficiency over 90% at 1C rate up to 50 cycles, which is very close to the theoretical value of Ge. The hybrid anode also shows rate capability during repeated cycles at 1C, 2C, 5C, and 10C rates. The elimination of polymeric binders in the fabricated anode would greatly rule out the issues arising from non-conducting nature of the binders and inhomogeneous distribution of active materials in the anode.

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