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Title: Proton enhanced dynamic battery chemistry for aprotic lithium–oxygen batteries

Water is generally considered to be deteriorating to the performance of aprotic Li-air batteries, while it is challenged by the disparate effects observed recently. This has provoked a range of discussion on the role of water and its impact on the battery operation. In this work, a distinct battery chemistry that prevails in water-contaminated aprotic Li-O 2 batteries was discovered. Both lithium ions and protons were found to be involved in the oxygen reduction (ORR) and evolution reactions (OER), and LiOOH and LiOH were identified as predominant materials in the discharge product. As a new lithium compound, the crystallographic and spectroscopic characteristics of LiOOH∙H 2O were scrutinized both experimentally and theoretically. The structure of LiOOH∙H 2O was found to be closely related to that of LiOH∙H 2O implying a fast conversion kinetics between the two phases. Intriguingly, LiOOH∙H 2O exhibits superior dynamic property towards the reaction with I 3 -, which renders considerably lower overpotential during the charging process. We anticipate that the new battery chemistry unveiled in this mechanistic study would provide important insights to the understanding of nominally aprotic Li-O 2 batteries and help to tackle the critical issues confronted.
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [3] ;  [2] ;  [4] ;  [1] ;  [1]
  1. National Univ. of Singapore (Singapore). Dept. of Materials Science and Engineering
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Univ. of Western Australia, Perth, WA (Australia). School of Chemistry and Biochemistry
  4. Chinese Academy of Sciences (CAS), Ningbo (China). Ningbo Inst. of Material Technology and Engineering
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Singapore National Science Foundation; USDOE
Country of Publication:
United States
OSTI Identifier: