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@ARTICLE{Lewerenz:866895,
author = {Lewerenz, Meinert and Sauer, Dirk Uwe},
title = {{E}valuation of cyclic aging tests of prismatic automotive
{L}i{N}i{M}n{C}o{O}2-{G}raphite cells considering influence
of homogeneity and anode overhang},
journal = {Journal of energy storage},
volume = {18},
issn = {2352-152X},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2019-05955},
pages = {421 - 434},
year = {2018},
abstract = {Cyclic aging tests of 20 compressed prismatic automotive
Li(NiMnCo)O2|Graphite cells are evaluated. The shallow
cyclic aging tests are conducted around five average SOCs
with respect to the anode. The cells are cycled at two DODs
and two C-rates. The irreversible capacity loss is evaluated
by the slope of the near-linear part at the end of aging
test. The homogeneity of lithium distribution (HLD) is
associated with peak height of differential voltage analysis
(DVA) and to capacity difference analysis (CDA). The
evaluations of DVA, CDA and capacity fade curve are
depending mainly on the average SOC and hardly on DOD or
C-rate. The trends correlate with the volume expansion
originated from the graphite. The highest HLD and the lowest
capacity fade are reached around $50\%$ SOC where hardly any
additional volume expansion occurs. In the SOC regions with
high volume expansion of the graphite the HLD reduces
dramatically and the capacity fade rises towards $0\%$ and
$100\%,$ respectively. Due to smeared characteristics in
DVA, capacity loss cannot be directly separated into shares
related to anode overhang, HLD, loss of active material and
residual irreversible losses. The combination of cell
compression and high gradients of volume expansion during
shallow cycling is found to be the root cause for the
flattening of DVA curves.},
cin = {IEK-12},
ddc = {333.7},
cid = {I:(DE-Juel1)IEK-12-20141217},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000439496500043},
doi = {10.1016/j.est.2018.06.003},
url = {https://juser.fz-juelich.de/record/866895},
}