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@ARTICLE{Li:810963,
author = {Li, Dongjiang and L. Danilov, Dmitri and Gao, Lu and Yang,
Yong and Notten, Peter H. L.},
title = {{D}egradation {M}echanisms of {C}$_{6}$/{L}i{F}e{PO}$_{4}$
{B}atteries: {E}xperimental {A}nalyses of {C}ycling-induced
{A}ging},
journal = {Electrochimica acta},
volume = {210},
issn = {0013-4686},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2016-03519},
pages = {445 - 455},
year = {2016},
abstract = {Electromotive force (EMF) voltage curves are regularly
determined to facilitate in-depth understanding of aging
mechanisms of C6/LiFePO4 batteries during cycling. The
irreversible capacity losses under various cycling
conditions and temperatures are accurately obtained from the
extrapolated EMF curves and are found to increase with cycle
number and time. A new mathematical extrapolation method is
proposed to distinguish between calendar ageing and
cycling-induced ageing. The capacity losses due to calendar
aging are obtained by extrapolating the total irreversible
capacity losses to zero cycle number. It is found that
calendar ageing increases logarithmically in time. On the
other hand, cycling-induced ageing is accurately determined
by extrapolating the capacity losses to zero time. In this
case the capacity losses are found to increase linearly with
cycle number. It is furthermore found that iron dissolution
from the cathode at 60 °C and the subsequent deposition
onto the anode enhances significantly the SEI formation on
the graphite electrode and, consequently, battery ageing.
Interestingly, the graphite electrode decay has been
quantified in much more detail, by analyzing the dVEMF/dQ
curves. The analyses show that the electrode decay can be
related to both the structural deterioration and the
inter-layer surface blockage of the graphite electrode, as
has also been experimentally confirmed by Raman and XPS
spectroscopy.},
cin = {IEK-9},
ddc = {540},
cid = {I:(DE-Juel1)IEK-9-20110218},
pnm = {131 - Electrochemical Storage (POF3-131)},
pid = {G:(DE-HGF)POF3-131},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000380746100055},
doi = {10.1016/j.electacta.2016.05.091},
url = {https://juser.fz-juelich.de/record/810963},
}