In situ small-angle X-ray scattering reveals solution phase discharge of Li-O₂ batteries with weakly solvating electrolytes.

ABSTRACT: Electrodepositing insulating lithium peroxide (Li₂O₂) is the key process during discharge of aprotic Li-O₂ batteries and determines rate, capacity, and reversibility. Current understanding states that the partition between surface adsorbed and dissolved lithium superoxide governs whether Li₂O₂ grows as a conformal surface film or larger particles, leading to low or high capacities, respectively. However, better understanding governing factors for Li₂O₂ packing density and capacity requires structural sensitive in situ metrologies. Here, we establish in situ small- and wide-angle X-ray scattering (SAXS/WAXS) as a suitable method to record the Li₂O₂ phase evolution with atomic to submicrometer

SUBMITTER: Prehal C 

PROVIDER: S-EPMC8040814 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature