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  • 09월 05일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Study of electrochemical properties for porous Li3V2(BO3)3/C as a cathode material its characterization using MAS NMR for Li-ion batteries

등록일
2017년 8월 18일 20시 05분 56초
접수번호
3013
발표코드
ANAL1.O-15 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 09시 : 44분
발표형식
구두발표
발표분야
Analytical Chemistry - Oral Presentation of Young Analytical Chemists I
저자 및
공동저자
Ji Won Lee, CHAEWON Moon, YOUNGIL LEE*
Department of Chemistry, University of Ulsan, Korea
Recently, poly-anion based compounds such as phosphates, silicates and borates as cathode materials for Li-ion battery have been developed for using in individual IT device, electric vehicles, and high energy storage systems have been investigated due to low cost and structural stability. Among these compounds, monoclinic Li3V2(PO4)3/C (LVP) has good thermal stability, structure stability and the highest theoretical specific capacity of 197 mAh g-1 in the potential range of 3.0 – 4.8 V. However, LVP has low electronic conductivity and Li-ion diffusion coefficient (10-8 to 10-14 cm2 s-1). So, we have attempted to fully exchange the phosphate to the borate in order to improve specific discharge capacity. This material has been synthesized by combustion synthesis method and the morphology, compositions and electrochemical performance of the synthesized sample were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Cycling test and Galvanostatic charge-discharge measurement and mainly mainly analyzed the structure character using solid-state MAS NMR. As a result, we demonstrates the electrochemical performances of a highly porous Li3V2(BO3)3/C, synthesized via combustion synthesis as a new cathode material with a wide range voltage operability of 0.9 to 4.5 V which delivered exceptionally high discharge capacity 257 mAhg-1 at 0.05 C, 95.6% of its theoretical capacity.

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