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Article Abstract
Operando scanning transmission electron microscopy observations of cathodic reactions in a liquid-cell Li-O microbattery in the presence of the redox mediator tetrathiafulvalene (TTF) in 1.0 m LiClO dissolved dimethyl sulfoxide electrolyte are reported. It is found that the TTF addition does not obviously affect the discharge reaction for the formation of a solid Li O phase. The coarsening of Li O nanoparticles occurs via both conventional Ostwald ripening and nonclassical crystallization by particle attachment. During charging, the oxidation reaction at significantly reduced charge potentials mainly takes place at Li O /electrolyte interfaces and has obvious correspondence with the oxidized TTF distributions in the electric fields of the charged electrode. This study provides direct evidence that TTF truly plays a role in promoting the decomposition of Li O as a soluble charge-transfer agent between the electrode and the Li O .
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| http://dx.doi.org/10.1002/adma.201702752 | DOI Listing |
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