Screening for Superoxide
Reactivity in Li-O<sub>2</sub> Batteries: Effect on Li<sub>2</sub>O<sub>2</sub>/LiOH Crystallization
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Abstract
Unraveling the fundamentals of Li-O<sub>2</sub> battery
chemistry
is crucial to develop practical cells with energy densities that could
approach their high theoretical values. We report here a straightforward
chemical approach that probes the outcome of the superoxide O<sub>2</sub><sup>–</sup>, thought to initiate the electrochemical
processes in the cell. We show that this serves as a good measure
of electrolyte and binder stability. Superoxide readily dehydrofluorinates
polyvinylidene to give byproducts that react with catalysts to produce
LiOH. The Li<sub>2</sub>O<sub>2</sub> product morphology is a function
of these factors and can affect Li-O<sub>2</sub> cell performance.
This methodology is widely applicable as a probe of other potential
cell components