Operando Analysis of a Lithium/Sulfur Battery by Small-Angle
Neutron Scattering
Posted on 2019-09-02 - 22:03
This study reports the use of operando small-angle neutron scattering to investigate processes
in an operating Li/S battery. The combination with impedance spectroscopy
yields valuable insights into the precipitation and dissolution of
lithium sulfide during 10 cycles of galvanostatic cycling. The use
of a deuterated electrolyte increases strongly the sensitivity to
detect the sulfur and Li2S precipitates at the carbon host
electrode and allows us to observe the time-dependent initial wetting
of the system. No correlation of the scattering signal of the micropores
with either lithium sulfide or sulfur is observable during the whole
course of the experiment. Hence both reaction products do not precipitate
inside the microporous structure but on the outer surface of the micrometer-sized
carbon fibers used in this study. The excellent scattering contrast
allows a detailed analysis of the formation and dissolution process
of nanoscopic Li2S structures. While lithium sulfide particles
grow homogeneously during the precipitation period, smaller Li2S particles dissolve first followed by a sudden dissolution
of the larger Li2S particles.
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Risse, Sebastian; Härk, Eneli; Kent, Ben; Ballauff, Matthias (2019). Operando Analysis of a Lithium/Sulfur Battery by Small-Angle
Neutron Scattering. ACS Publications. Collection. https://doi.org/10.1021/acsnano.9b03453