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  • 02월 28일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Preparation of lithium iron pyrophosphate as cathode material for lithium ion battery

2019년 2월 8일 14시 18분 37초
ANAL2.O-15 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 09시 : 56분
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
저자 및
Chaewon Moon, Youngil Lee*
Department of Chemistry, University of Ulsan, Korea
Lithium-ion batteries are the most important energy storage system for wide applications in electronic portable devices and electric vehicles. Among cathode materials, the olivine structured lithium iron phosphate (LiFePO4), has low cost, low toxicity, high thermal stability and high relatively high theoretical specific capacity. However, its poor high-rate performance of this material restricts its use in large-scale application owing to its low electronic conductivity and slow lithium-ion diffusion. As an alternative cathode material, Li2FeP2O7 consisted by pyrophosphate (P2O7)4- is driven by their thermal stability and improved safety. Pyrophosphate has a two-dimensional lithium diffusion channel and capability to extract more than one lithium ion per formula unit. Iron-based pyrophosphate has cyclic voltammetry (CV) peaks that appear Fe2+/Fe3+ redox couple at the range of 3.5 ~ 4.0V. In this study, anion doping like fluorine anion is adopted to improve the electrochemical property through the improvement of conductivity. The electrochemical properties of samples were investigated through lithium extraction/inserting processes using galvano-static charge/discharge and CV measurements to investigate for Li+ transferring between the electrode materials. Also, solid-state 7Li NMR have been observed to characterize the structural transformation.