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| Type |
Oral Presentation |
| Area |
Oral Presentation of Young Analytical Chemists II |
| Room No. |
Room 202 |
| Time |
FRI 09:56-10:00 |
| Code |
ANAL2.O-15 |
| Subject |
Preparation of lithium iron pyrophosphate as cathode material for lithium ion battery |
| Authors |
Chaewon Moon, Youngil Lee*
Department of Chemistry, University of Ulsan, Korea
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| Abstract |
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. |
| E-mail |
cwm1216@naver.com |
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123rd General Meeting of the KCS