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@ARTICLE{Zehetmaier:865566,
author = {Zehetmaier, Peter M. and Cornélis, Arnaud and Zoller,
Florian and Boeller, Bernhard and Wisnet, Andreas and
Döblinger, Markus and Boehm, Daniel and Bein, Thomas and
Fattakhova-Rohlfing, Dina},
title = {{N}anosized {L}ithium-rich {C}obalt {O}xide {P}articles and
their {T}ransformation to {L}ithium {C}obalt {O}xide
{C}athodes with {O}ptimized {H}igh-rate {M}orphology},
journal = {Chemistry of materials},
volume = {31},
number = {21},
issn = {1520-5002},
address = {Washington, DC},
publisher = {American Chemical Society},
reportid = {FZJ-2019-04931},
pages = {8685-8694},
year = {2019},
abstract = {We report the formation of crystalline dispersible
LixCo1-xO nanoparticles with an unusual rock-salt phase
containing ~15 $at\%$ Li in the crystalline structure. This
is the first time that this composition was formed at
temperatures as low as 150 °C under conditions of a
solvothermal process, although it is referred to as a high
temperature metastable phase in a very limited number of
known publications. The Li0.15Co0.85O nanoparticles of 2-3
nm in size completely transform to high-temperature
LiCoO2(HT-LCO) nanoparticles at 560 °C in the presence of
slightly overstoichiometric amounts of Li source. The
presence of lithium in the CoO lattice slows down the
kinetics of its phase transformation, enabling to obtain
very small HT-LCO nanocrystals during the subsequent
calcination. The HT-LCO particles formed after this
transformation have an elongated shape with a mean size of
about 17 x 60 nm, which is targeted as an optimum size for
battery applications. An attractive feature of the
Li0.15Co0.85O nanoparticles is their high dispersibility
enabling their assembly into different nanostructures with
optimized morphology. Open porous HT-LCO electrodes prepared
via self-assembly of Li0.15Co0.85O nanoparticles and
Pluronic F127 as a structure-directing agent demonstrate
very good performance at high current densities representing
short charge/discharge times below 10 minutes. Even at
charge/discharge times of 72 seconds (50C), $50\%$ of the
theoretical capacity has been preserved. After 250 cycles at
charge/discharge times of 6 minutes (10C), over $60\%$ of
the initial discharge capacity was retained},
cin = {IEK-1},
ddc = {540},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {899 - ohne Topic (POF3-899)},
pid = {G:(DE-HGF)POF3-899},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000497262500010},
doi = {10.1021/acs.chemmater.9b02231},
url = {https://juser.fz-juelich.de/record/865566},
}