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Wang A, Wu X, Zou Z, Qiao Y, Wang D, Xing L, Chen Y, Lin Y, Avdeev M, Shi S. The Origin of Solvent Deprotonation in LiI-added Aprotic Electrolytes for Li-O 2 Batteries. Angew Chem Int Ed Engl 2023; 62:e202217354. [PMID: 36749300 DOI: 10.1002/anie.202217354] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 02/08/2023]
Abstract
LiI and LiBr have been employed as soluble redox mediators (RMs) in electrolytes to address the sluggish oxygen evolution reaction kinetics during charging in aprotic Li-O2 batteries. Compared to LiBr, LiI exhibits a redox potential closer to the theoretical one of discharge products, indicating a higher energy efficiency. However, the reason for the occurrence of solvent deprotonation in LiI-added electrolytes remains unclear. Here, by combining ab initio calculations and experimental validation, we find that it is the nucleophile I O 3 - ${{{\rm I}{\rm O}}_{3}^{-}}$ that triggers the solvent deprotonation and LiOH formation via nucleophilic attack, rather than the increased solvent acidity or the elongated C-H bond as previously suggested. As a comparison, the formation of B r O 3 - ${{{\rm B}{\rm r}{\rm O}}_{3}^{-}}$ in LiBr-added electrolytes is found to be thermodynamically unfavorable, explaining the absence of LiOH formation. These findings provide important insight into the solvent deprotonation and pave the way for the practical application of LiI RM in aprotic Li-O2 batteries.
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Affiliation(s)
- Aiping Wang
- State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China
| | - Xiaohong Wu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Zheyi Zou
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Yu Qiao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Da Wang
- State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China
| | - Lidan Xing
- China National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES (Ministry of Education), Research Center of BMET (Guangdong Province), School of Chemistry, South China Normal University, Guangzhou, 510006, China
| | - Yuhui Chen
- State Key Laboratory of Materials-oriented Chemical Engineering, School of Energy, Nanjing Tech University, Nanjing, 211816, China
| | - Yuxiao Lin
- School of physics and electronic engineering, Jiangsu Normal University, Xuzhou, 221116, China
| | - Maxim Avdeev
- Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee, DC NSW 2232, Australia.,School of Chemistry, The University of Sydney, Sydney, 2006, Australia
| | - Siqi Shi
- State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China.,Materials Genome Institute, Shanghai University, Shanghai, 200444, China
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Tolmachev YV, Piatkivskyi A, Ryzhov VV, Konev DV, Vorotyntsev MA. Energy cycle based on a high specific energy aqueous flow battery and its potential use for fully electric vehicles and for direct solar-to-chemical energy conversion. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-015-2805-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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4
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Partanen JI, Hasan M, Vahteristo KP, Louhi-Kultanen M. Determination of the Pitzer Interaction Parameters at 273.15 K from the Freezing-Point Data Available for Solutions of Uni-Univalent Electrolytes. Ind Eng Chem Res 2014. [DOI: 10.1021/ie503201m] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jaakko I. Partanen
- Department of Chemical Technology, Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland
| | - Mehdi Hasan
- Department of Chemical Technology, Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland
| | - Kari P. Vahteristo
- Department of Chemical Technology, Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland
| | - Marjatta Louhi-Kultanen
- Department of Chemical Technology, Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland
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