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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Stacking density regulated ultrahigh capacity ternary metal oxide/graphene composite for LIB anode

등록일
2015년 8월 27일 16시 56분 24초
접수번호
1071
발표코드
MAT.P-462 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 16일 (금요일) 13:00~14:30
발표형식
포스터
발표분야
재료화학
저자 및
공동저자
S.J. Richard Prabakar, 표명호*
순천대학교 인쇄전자공학과, Korea
Graphene has emerged as the one most actively pursued material with limitless application in fields of energy production and storage. Regulating the stacking density of graphene layers can open new vistas and diverse possibilities, especially in energy storage materials. Various metal oxides (MO) or ternary metal oxides (TMO) intended for anode and cathode materials for LIB have been composited with graphene to enhance the electrochemical performance, stability, and longevity of the MO/TMO. In this work, we report the successful entrapment of Sn based ternary metal oxide (CoSnO3) sandwiched between graphene layers. The stacking density of the graphene stacks was controlled by applying a novel procedure involving pre-aligning of oppositely charged graphene layers in solution. An electrostatic aligning of positively charged amine functionalized graphene (GN) with Co2+/Sn2+ anchored graphene oxide (CSG) in an acidic solution results in a densely stacked composite (CSG/GN) sandwiching CoSnO3 between graphene layers. This configuration provides excellent stability and an unprecedented capacity response during electrochemical cycling. A specific capacity response approaching ~1500 mAh.g-1 at a charge/discharge current density of 100mA.g-1 is achieved, which is unprecedented and surpasses the theoretical capacity of CoSnO3 and CoSnO3/graphene based LIB anodes. Composites synthesized under identical conditions avoiding the pre-aligning process result in sparse stacked composites showing lower capacity response (~600 mAh.g-1) with poor electrochemical and structural stability. The origin of the ultrahigh capacity is believed to be arising from enhanced reversibility of a conversion reaction stabilized by the compact structure, which is facilitated by the pre-aligning process.

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