Structural evolution upon charge-discharge reaction of Fe-based layered oxide cathode materials for Sodium-ion batteries

Title
Structural evolution upon charge-discharge reaction of Fe-based layered oxide cathode materials for Sodium-ion batteries
Authors
정경윤장혜정조민경김양희김지영디키 수산토
Keywords
Sodium-ion batteries; Fe-based layered oxide cathode materials
Issue Date
2017-11
Publisher
The 3rd East-Asia Microscopy Conference (EAMC3)
Abstract
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
URI
http://pubs.kist.re.kr/handle/201004/68036
Appears in Collections:
KIST Publication > Conference Paper
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