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@ARTICLE{Zhou:851117,
author = {Zhou, Dong and Jia, Haiping and Rana, Jatinkumar and
Placke, Tobias and Scherb, Tobias and Kloepsch, Richard and
Schumacher, Gerhard and Winter, Martin and Banhart, John},
title = {{L}ocal structural changes of nano-crystalline
{Z}n{F}e2{O}4 during lithiation and de-lithiation studied by
{X}-ray absorption spectroscopy},
journal = {Electrochimica acta},
volume = {246},
issn = {0013-4686},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2018-04819},
pages = {699 - 706},
year = {2017},
abstract = {X-ray absorption spectroscopy was carried out to
investigate local structural changes around Fe and Zn atoms
of the nano-crystalline spinel ferrite ZnFe2O4 anode
material at various states-of-charge during the 1st and 2nd
lithiation/de-lithiation. From the X-ray absorption near
edge structure (XANES) and extended X-ray absorption fine
structure (EXAFS), we propose a possible structure evolution
process of the ZnFe2O4 electrode during the 1st discharge
and charge cycle. A mixture of metallic iron, ZnO, metallic
zinc, LiZn and Li2O phases seem to be formed as the cell is
firstly discharged to 0.02 V. Instead of the original
ZnFe2O4 spinel phase, the metallic iron and zinc particles
are re-oxidized to Fe2O3 and ZnO phases during the
subsequent de-lithiation. A reversible redox reaction
between Fe2O3, ZnO and lithium ions is found in the 2nd
cycle. The formation of SEI layer in the initial cycles
plays a major role in the irreversible capacity of the
electrode. The inactive disordered ZnO formed due to the
conversion reaction of ZnFe2O4 during the 1st lithiation is
probably the main reason for the poor electrochemical
behavior of the nano-crystalline ZnFe2O4 electrode.},
cin = {IEK-12},
ddc = {540},
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:000406942800077},
doi = {10.1016/j.electacta.2017.06.098},
url = {https://juser.fz-juelich.de/record/851117},
}