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Title: Tuning the Reversibility of Mg Anodes via Controlled Surface Passivation by H2O/Cl in Organic Electrolytes

Journal Article · · Chemistry of Materials
 [1];  [2];  [1];  [1];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR) and Materials Science Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR) and Materials Science Division; University of Ljubljana (Slovenia). Department of Chemical Engineering and Technical Safety

Developing a new generation of battery chemistries is a critical challenge to moving beyond current Li-ion technologies. In this work, we introduce a surface-science-based approach for understanding the complex phenomena controlling the reversibility of Mg anodes for Mg-ion batteries. In addition, we identify the profound impact of trace levels of H2O (≤3 ppm) on the kinetics of Mg deposition and determine that passive films of MgO and Mg(OH)2 are formed only after Mg deposition ceases, rather than continuously during Mg reduction. We also find that Cl inhibits passivation through the formation of adsorbed Cl (Mg–Cl(ad)) and/or MgCl2 on the surface, as well as through a dynamic competition with H2O in the double layer. In conclusion, this surface-science-based approach goes well beyond Mg anodes, highlighting the need for more in-depth understanding of electrolyte chemistries before a new generation of efficient and reversible battery technologies can be realized.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1339153
Journal Information:
Chemistry of Materials, Vol. 28, Issue 22; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 114 works
Citation information provided by
Web of Science

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Opportunities and Challenges in the Development of Cathode Materials for Rechargeable Mg Batteries journal December 2018
Electrochemical‐Conditioning‐Free and Water‐Resistant Hybrid AlCl 3 /MgCl 2 /Mg(TFSI) 2 Electrolytes for Rechargeable Magnesium Batteries journal February 2019
Halogenid‐basierte Materialien und Chemie für wiederaufladbare Batterien journal January 2020
Computational Insights into Mg‐Cl Complex Electrolytes for Rechargeable Magnesium Batteries journal June 2019
A general synthetic methodology to access magnesium aluminate electrolyte systems for Mg batteries journal January 2019
Fervent Hype behind Magnesium Batteries: An Open Call to Synthetic Chemists-Electrolytes and Cathodes Needed journal August 2017
Rechargeable Magnesium Batteries using Conversion-Type Cathodes: A Perspective and Minireview journal July 2018
Post-Li batteries: promises and challenges
  • Ponrouch, Alexandre; Palacín, M. Rosa
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2152 https://doi.org/10.1098/rsta.2018.0297
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O 2 reduction on a Au film electrode in an ionic liquid in the absence and presence of Mg 2+ ions: Product formation and adlayer dynamics journal January 2019
Mg Cathode Materials and Electrolytes for Rechargeable Mg Batteries: A Review journal January 2019
Reversible S 0 /MgS x Redox Chemistry in a MgTFSI 2 /MgCl 2 /DME Electrolyte for Rechargeable Mg/S Batteries journal September 2017
Electrochemical-Conditioning-Free and Water-Resistant Hybrid AlCl 3 /MgCl 2 /Mg(TFSI) 2 Electrolytes for Rechargeable Magnesium Batteries journal February 2019
Halide‐Based Materials and Chemistry for Rechargeable Batteries journal January 2020