Vanadium(III) Acetylacetonate as an Efficient Soluble Catalyst for Lithium-Oxygen Batteries.

Author(s) Zhao, Q.; Katyal, N.; Seymour, I.D.; Henkelman, G.; Ma, T.
Journal Angew Chem Int Ed Engl
Date Published 2019 Jul 12
Abstract

High donor number (DN) solvents in Li-O batteries that dissolve superoxide intermediates in lithium peroxide (Li O ) formation facilitate high capacities at high rates and avoid early cell death. However, their beneficial characteristics also result in an instability towards highly reactive superoxide intermediates. Furthermore, Li-O batteries would deliver a superior energy density, but the multiphase electrochemical reactions are difficult to achieve when operating with only solid catalysts. Herein we demonstrate that vanadium(III) acetylacetonate (V(acac) ) is an efficient soluble catalyst that can address these problems. During discharge, V(acac) integrates with the superoxide intermediate, accelerating O reduction kinetics and reducing side reactions. During charge, V(acac) acts as a redox mediator that permits efficient oxidation of Li O . The cells with V(acac) exhibit low overpotential, high rate performance, and considerable cycle stability.

DOI 10.1002/anie.201907477
ISSN 1521-3773
Citation Zhao Q, Katyal N, Seymour ID, Henkelman G, Ma T. Vanadium(III) Acetylacetonate as an Efficient Soluble Catalyst for Lithium-Oxygen Batteries. Angew Chem Int Ed Engl. 2019.

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