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@ARTICLE{Windmller:877718,
author = {Windmüller, Anna and Bridges, Craig A. and Tsai, Chih-Long
and Lobe, Sandra and Dellen, Christian and Veith, Gabriel M.
and Finsterbusch, Martin and Uhlenbruck, Sven and Guillon,
Olivier},
title = {{I}mpact of {F}luorination on {P}hase {S}tability,
{C}rystal {C}hemistry, and {C}apacity of {L}i{C}o{M}n{O} 4
{H}igh {V}oltage {S}pinels},
journal = {ACS applied energy materials},
volume = {1},
number = {2},
issn = {2574-0962},
address = {Washington, DC},
publisher = {ACS Publications},
reportid = {FZJ-2020-02419},
pages = {715 - 724},
year = {2018},
abstract = {Fluorinated LiCoMnO4−yFy (y = 0, 0.05, 0.1) spinel
electrodes, electrochemically active at 5−5.3 V versus
Li/Li+, show enhanced phase purity and enhanced capacity
with increasing y. We disclose the impact of fluorination on
the phase purity and reversible capacity of LiCoMnO4 via
joint Rietveld refinement of neutron and synchrotron powder
diffraction data, combined with micro-Raman spectroscopy. It
is found that fluorination stabilizes the spinel phase and
hinders precipitation of Li2MnO3 as a secondary phase, which
controls the cation distribution on tetrahedral and
octahedral sites in spinel. That is to say, for higher
fluorine content the cobalt occupancy at the tetrahedral
site in spinel decreases, and the lithium occupancy
increases. Accordingly, the number of lithium sites that are
available for electrochemical extraction and insertion of
lithium ions is raised so that the capacity isincreased.
Further investigation of the lithium ion diffusion by means
of cyclic voltammetry at different scan rates and the
application of the Randles−Sevcik equation were carried
out to investigate the extent of capacity enhancement due to
faster lithium ion diffusion in the high voltage region.},
cin = {IEK-1},
ddc = {540},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {131 - Electrochemical Storage (POF3-131) / BMBF-03SF0477A -
DESIREE : Defektspinelle als Hochenergie- und
Hochleistungsmaterialien zur elektrochemischen
Energiespeicherung, Teilprojekte:
Partikelmikrostrukturierung und Modellsysteme,
Makroskopische und atomistische Analyse von
elektrochemischen Vorgängen (BMBF-03SF0477A)},
pid = {G:(DE-HGF)POF3-131 / G:(DE-82)BMBF-03SF0477A},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000458705100061},
doi = {10.1021/acsaem.7b00186},
url = {https://juser.fz-juelich.de/record/877718},
}