Scalable synthesis and electrochemical investigations of fluorine-doped lithium manganese spinel oxide

Title
Scalable synthesis and electrochemical investigations of fluorine-doped lithium manganese spinel oxide
Authors
이해리이보은정경윤조병원이관영오시형
Keywords
lithium manganese spinel; fluorine doping; electrochemical properties; X-ray absorption spectroscopy
Issue Date
2014-08
Publisher
Electrochimica acta
Citation
VOL 136, 396-403
Abstract
A scalable synthesis route for the preparation of fluorine-doped lithium manganese spinel was developed. The effect of 2.5% fluorine doping on the properties of aluminum-doped lithium manganese spinel was investigated by examining the electrochemical performance and structural changes. The electrochemical study indicates that the initial discharge capacity increases by about 5% while other properties, like the capacity retention and rate performance, remain almost unchanged. The structural studies indicate that no impurity phase was formed, along with only little morphological changes and a slight increase in the lattice parameter. The Mn K-edge absorption spectra clearly show that the average manganese oxidation state decreases as a result of fluorine doping and Mn LII,III -edge spectra indicate that the electronic structure of the fluorine-doped spinel changes significantly, which may alleviate the intrinsic structural instability of this material.
URI
http://pubs.kist.re.kr/handle/201004/47763
ISSN
00134686
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KIST Publication > Article
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