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대한화학회 제124회 학술발표회 및 총회 Synthesis of fluorine doped structured Li2FeP2O7 and its electrochemical and structural characterizations

등록일
2019년 8월 26일 14시 15분 32초
접수번호
3112
발표코드
ANAL2.O-15 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 09시 : 42분
발표형식
구두발표
발표분야
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
저자 및
공동저자
Chaewon Moon, Youngil Lee*
Department of Chemistry, University of Ulsan, Korea
Lithium-ion batteries (LIBs) as attractive power source have contributed to commercial success of electronic device. The LIBs have been predominately used in portable electronic devices, and its applications have expanded into electric vehicle (EV), energy storage system (ESS) and smart-grid technology. The motivation for using a LIBs relies on its high energy density, fast charge and discharge efficiency, stable operating at strict condition, and eco-reliability. As a cathode material, lithium metal pyrophosphates, LiMP2O7 (M = Mn, Co, Fe, V), have been subjected to intense recent research. Among them, LiFeP2O7 (LFPO) shows superior ionic diffusivity, inferior electronic conductivity and structural stability due to strong P–O bond as polyanion. Therefore, anion doping into the polyanion site can be able to improve intrinsic electrochemical properties such as band gap, and enhance lithium diffusion limitations. Consequently, fluorine anion (F-) has been selected as a dopant in for oxygen sites. The fluorine doped LFPO has been synthesized by solid state reaction method. The structural study of the material has been investigated by X-ray diffraction and 7Li MAS NMR. And the electrochemical performances have been characterized with designed galvanostatic cycling in various C rates and cyclic voltammetry (CV) measurement.

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