Proton enhanced dynamic battery chemistry for aprotic lithium–oxygen batteries

Yun Guang Zhu, Qi Liu, Yangchun Rong, Haomin Chen, Jing Yang, Chuankun Jia, Li-Juan Yu, Amir Karton, Yang Ren, Xiaoxiong Xu, Stefan Adams and Qing Wang ()
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Yun Guang Zhu: Faculty of Engineering, National University of Singapore
Qi Liu: Advanced Photon Source, Argonne National Laboratory
Yangchun Rong: Advanced Photon Source, Argonne National Laboratory
Haomin Chen: Faculty of Engineering, National University of Singapore
Jing Yang: Faculty of Engineering, National University of Singapore
Chuankun Jia: Faculty of Engineering, National University of Singapore
Li-Juan Yu: School of Chemistry and Biochemistry, The University of Western Australia, 35 Stirling Highway Crawley
Amir Karton: School of Chemistry and Biochemistry, The University of Western Australia, 35 Stirling Highway Crawley
Yang Ren: Advanced Photon Source, Argonne National Laboratory
Xiaoxiong Xu: Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences
Stefan Adams: Faculty of Engineering, National University of Singapore
Qing Wang: Faculty of Engineering, National University of Singapore

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Water contamination is generally considered to be detrimental to the performance of aprotic lithium–air batteries, whereas this view is challenged by recent contrasting observations. This has provoked a range of discussions on the role of water and its impact on batteries. In this work, a distinct battery chemistry that prevails in water-contaminated aprotic lithium–oxygen batteries is revealed. Both lithium ions and protons are found to be involved in the oxygen reduction and evolution reactions, and lithium hydroperoxide and lithium hydroxide are identified as predominant discharge products. The crystallographic and spectroscopic characteristics of lithium hydroperoxide monohydrate are scrutinized both experimentally and theoretically. Intriguingly, the reaction of lithium hydroperoxide with triiodide exhibits a faster kinetics, which enables a considerably lower overpotential during the charging process. The battery chemistry unveiled in this mechanistic study could provide important insights into the understanding of nominally aprotic lithium–oxygen batteries and help to tackle the critical issues confronted.

Date: 2017
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DOI: 10.1038/ncomms14308

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