Structural evolution upon charge-discharge reaction of Fe-based layered oxide cathode materials for Sodium-ion batteries
- Structural evolution upon charge-discharge reaction of Fe-based layered oxide cathode materials for Sodium-ion batteries
- 정경윤; 장혜정; 조민경; 김양희; 김지영; 디키 수산토
- Sodium-ion batteries; Fe-based layered oxide cathode materials
- Issue Date
- The 3rd East-Asia Microscopy Conference (EAMC3)
- Large-scale batteries with electrode materials made from the earth-abundant elements are needed to accomplish sustainable energy development. From a point of view materials abundance and cost, rechargeable sodium batteries with iron-based cathode materials are strong candidates for large-scale batteries. O3-type NaFeO2 prepared by solid-state method can deliver 80 ~ 100 mAhg− 1 of reversible capacity with a nearly flat voltage profile at about 3.3 V. However, the electrode performance is considerably deteriorated as the desodiation progressed. In this study, we investigated the structural and chemical composition changes of the desodiated NaxFeO2 particles in order to enhance the irreversibility of the layered NaFeO2 cathode in sodium-ion cells. The phase change at the surface and corresponding chemical state change of NaxFeO2 particles were observed using transmission electron microscopy (TEM, Titan 80-300, FEI) equipped with electron energy loss spectroscopy (EELS, Quantum 966, Gatan). TEM samples for the NaxFeO2 particles was prepared using focused ion beam (FIB, Quanta 3D, FEI) and subsequently loaded on the vacuum transfer holder (Model 648, Gatan) in the glove box in order to minimize oxidation and humidity. Then the holder was inserted into the TEM column keeping the sample in a vacuum
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