20.500.12556/RUNG-3003-d9de035e-f0c5-4d75-5ccb-8a76d1754d41
The mechanism of Li2S activation in lithium-sulfur batteries: Can we avoid the polysulfide formation?
Electrochemical reactions in the LieS batteries are considered as a multistep reaction process with at least
2e3 equilibrium states. Here we report a possibility of having a conversion of Li2S into sulfur without
detectible formation of polysulfides. That was confirmed by using a novel material system consisting of
carbon coated Li2S particles prepared by carbothermal reduction of Li2SO4. Two independent in operando
measurements showed direct oxidation of Li2S into sulfur for this system, with almost negligible formation
of polysulfides at potentials above 2.5 V vs. Li/Liþ. Our results link the diversity of first charge profiles in the
literature to the Li2S oxidation mechanism and show the importance of ionic wiring within the material.
Furthermore, we demonstrate that the Li2S oxidation mechanism depends on the relative amount of
soluble sulfur in the electrolyte. By controlling the type and the amount of electrolyte within the encapsulating
carbon shell, it is thereby possible to control the reaction mechanism of Li2S activation.
Lithium-sulfur batteries
Li2S active material
XAS
UV/Vis spectroscopy
Li2S activation
true
true
false
Angleški jezik
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Delo ni kategorizirano
2017-03-03 08:59:51
2017-03-03 10:05:08
2023-06-09 03:19:55
0000-00-00 00:00:00
2017
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0
208-217
344
2017
0000-00-00
Zaloznikova
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
4706555
http://dx.doi.org/10.1016/j.jpowsour.2017.01.112
URN:SI:UNG:REP:HW5BO5OE
Univerza v Novi Gorici
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1
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