DataVXBatteries & SupercapsPaper
journal article·2022-09Open access

Competitive Oxygen Reduction Pathways to Superoxide and Peroxide during Sodium‐Oxygen Battery Discharge

Zarko P. Jovanov, Lukas Lutz, Juan G. Lozano, Conrad Holc, Xiangwen Gao, Alexis Grimaud, Jean‐Marie Tarascon, Yuhui Chen, Lee R. Johnson, Peter G. Bruce

Batteries & Supercaps· Volume 5· Issue 9
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Source abstract

Abstract

Abstract The sodium‐air battery offers a sustainable, high‐energy alternative to lithium‐ion batteries. Discharge in the cell containing glyme‐based electrolytes can lead to formation of large cubic NaO2 particles via a solution‐precipitation mechanism. While promising, high rates result in sudden death. The exact nature of the discharge product has been a matter of contention, and Na2O2 has never been directly detected in a dry glyme Na−O2 cell. If Na2O2 were to form during discharge in the Na−O2 cell it would have a detrimental impact on cell performance. Here we show that Na2O2 forms during discharge at high overpotential in the glyme‐based Na−O2 batteries. Na2O2 formation is confirmed by spectroscopic and electrochemical analysis and electron microscopy demonstrates that it results in thin insulating films at the electrode surface. The formation of these thin films results in rapid cell death during discharge, introducing an inherent chemical limitation to the Na−O2 battery.
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Research context

Energy storage

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departments of Materials and Chemistry University of Oxford Oxford OX2 6HT U.K.

LIQUIDLOOP GmbH Hardenbergstr. 38 10623 Berlin Germany

Collège de France 11 place Marcelin Berthelot 75231 Paris Cedex France

Nottingham Applied Materials and Interfaces (NAMI) Group GSK Carbon Neutral Laboratories for Sustainable Chemistry University of Nottingham Nottingham NG7 2TU U.K.

Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 U.S.A.

State Key Laboratory of Materials-oriented Chemical Engineering College of Chemical Engineering and School of Energy Science and Engineering Nanjing Tech University Nanjing Jiangsu 211816 China

Funding

Engineering and Physical Sciences Research Council

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