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@ARTICLE{Bank:888330,
author = {Bank, Thomas and Feldmann, Jan and Klamor, Sebastian and
Bihn, Stephan and Sauer, Dirk Uwe},
title = {{E}xtensive aging analysis of high-power lithium titanate
oxide batteries: {I}mpact of the passive electrode effect},
journal = {Journal of power sources},
volume = {473},
issn = {0378-7753},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2020-04849},
pages = {228566 -},
year = {2020},
abstract = {Partial electrification of vehicle drive trains, for
example by the usage of 48 V systems, require
high-powerbatteries with extreme robustness to temperatures,
current rates and energy throughputs. In this study,
theapplication-relevant lifetime performance of 33
state-of-the-art high-power lithium titanate oxide nickel
manganesecobalt oxide (LTO|NMC) cells is measured under
cyclic, calendar, and drive cyclic aging regimes.
Regularextended check-ups reveal the cell performance in
terms of capacity loss and internal resistance increase,
whichallows for the identification of critical operating
conditions. For the first time a passive electrode effect
isidentified in calendar aging tests of LTO cells in which
the cathode is geometrically and capacitively
oversized.Passive electrode areas lead to a change in cell
balancing, which can be illustrated by the shift of the
half-cellvoltage curves. Generally, the investigated cells
show an excellent cycle stability for shallow cycles, even
athigh ambient temperatures and high current rates. Only
large cycle depths greater than $70\%$ at elevated
temperaturesreduce the battery life significantly.
Furthermore, the results show that cells cycled in areas of
low stateof charge age faster than in areas of high state of
charge. The rise in internal resistance under calendar aging
hasthe most detrimental influence on lifetime in a 48 V
battery.},
cin = {IEK-12},
ddc = {620},
cid = {I:(DE-Juel1)IEK-12-20141217},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
pubmed = {WOS:000564495000005},
UT = {WOS:000564495000005},
doi = {10.1016/j.jpowsour.2020.228566},
url = {https://juser.fz-juelich.de/record/888330},
}