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@ARTICLE{Bitzer:812031,
author = {Bitzer, Martin and Van Gestel, Tim and Uhlenbruck, Sven and
Buchkremer, Hans Peter},
title = {{S}ol-gel synthesis of thin solid
{L}i$_{7}${L}a$_{3}${Z}r$_{2}${O}$_{12}$ electrolyte films
for {L}i-ion batteries},
journal = {Thin solid films},
volume = {615},
issn = {0040-6090},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2016-04327},
pages = {128–134},
year = {2016},
abstract = {The application of a solid state electrolyte layer could
greatly improve current Li-ion batteries in terms of safety
and reliability. Garnet-type Li7La3Zr2O12 (LLZ) appears as a
candidate material, since it shows the highest reported
Li-ion conductivity of all oxide ceramics at room
temperature (σ > 10− 4 S cm− 1) and at the same time
chemical stability against lithium. In this paper, a sol-gel
process is presented for fabricating homogeneous thin film
LLZ layers. These layers were deposited using dip-coating
and spin-coating methods. A stable Yttrium-doped
Li-La-Zr-based sol with a particle size of d50 = 10 nm was
used as coating liquid. Successful deposition of such layers
was accomplished using a sol concentration of 0.04 mol/l,
which yielded for each coating step a layer thickness of ~
50 nm. The desired single phase LLZ material could be
obtained after thermal treatment at 800 °C for 10 min in
Argon. Ionic conductivity of the layers was demonstrated
with impedance spectroscopy. Continuing work on the
development of half-cells is also presented. Half-cells
which contain the novel LLZ electrolyte layer, a LiCoO2
cathode and a steel support were synthesized and
investigated. Of considerable importance was the prevention
of Lanthanum diffusion and the formation of non-conductive
phases (e.g. La2Li0.5Co0.5O4) at the required heating
temperature of 800 °C. It is shown that these unwanted
processes can be prevented and that a structure with a
single phase LLZ and LiCoO2 layer can be obtained by
modifying the heating program to a rapid thermal treatment
(10 K/s, 800 °C, no holding time).},
cin = {IEK-1},
ddc = {070},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000381939700020},
doi = {10.1016/j.tsf.2016.07.010},
url = {https://juser.fz-juelich.de/record/812031},
}