This study quantifies the thermal stability of oxide SEs with Li metal and observes thermal runaway behaviors of common SEs with Li metal. Theoretic calculations and experiments indicate that the oxygen generation from the SEs at elevated temperatures triggers a highly exothermic reaction with molten metallic Li, leading to thermal runaway. As an alert to the community, our results highlight the urgency to systematically investigate and deepen the understanding of safety issues in ASSBs.
Owing
to its unique structure, Chevrel phase (CP) is a promising
candidate for applications in rechargeable multivalent (Mg and Al)
batteries. However, its wide applications are severely limited by
time-consuming and complex synthesis processes, accompanied by uncontrollable
growth and large particle sizes, which will magnify the charge trapping
effect and lower the electrochemical performance. Here, an iodine
vapor transport reaction (IVT) is proposed to obtain large-scale and
highly pure Mo6S8 nanosheets, in which iodine
helps to regulate the growth kinetics and induce the preferential
growth of Mo6S8, as a typical three-dimensional
material, to form nanosheets. When applied in rechargeable multivalent
(Mg and Al) batteries, Mo6S8 nanosheets show
very fast kinetics owing to the short diffusion distance, thereby
exhibiting lower polarization, higher capacities, and better low-temperature
performance (up to −40 °C) compared to that of microparticles
obtained via the conventional method. It is anticipated
that Mo6S8 nanosheets would boost the application
of Chevrel phase, especially in areas of energy storage and catalysis,
and the IVT reaction would be generalized to a wide range of inorganic
compound nanosheets.
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