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Title: Electrolytic conditioning of a magnesium aluminum chloride complex for reversible magnesium deposition

Journal Article · · Journal of Physical Chemistry. C
DOI:https://doi.org/10.1021/jp506951b· OSTI ID:1235247
 [1];  [1];  [2];  [1];  [1]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We describe in this report the electrochemistry of Mg deposition and dissolution from the magnesium aluminum chloride complex (MACC). The results define the requirements for reversible Mg deposition and definitively establish that voltammetric cycling of the electrolyte significantly alters its composition and performance. Elemental analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy (SEM-EDS) results demonstrate that irreversible Mg and Al deposits form during early cycles. Electrospray ionization-mass spectrometry (ESI-MS) data show that inhibitory oligomers develop in THF-based solutions. These oligomers form via the well-established mechanism of a cationic ring-opening polymerization of THF during the initial synthesis of the MACC and under resting conditions. In contrast, MACC solutions in 1,2-dimethoxyethane (DME), an acyclic solvent, do not evolve as dramatically at open circuit potential. Furthermore, we propose a mechanism describing how the conditioning process of the MACC in THF improves its performance by both tuning the Mg:Al stoichiometry and eliminating oligomers.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1235247
Report Number(s):
SAND-2014-17888J; 537642
Journal Information:
Journal of Physical Chemistry. C, Vol. 118, Issue 48; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 139 works
Citation information provided by
Web of Science

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Ambient-Temperature Energy Storage with Polyvalent Metal-Sulfur Chemistry journal October 2017
A novel magnesium electrolyte containing a magnesium bis(diisopropyl)amide–magnesium chloride complex for rechargeable magnesium batteries journal January 2019
The Role of MgCl 2 as a Lewis Base in ROMgCl-MgCl 2 Electrolytes for Magnesium-Ion Batteries journal February 2016
Electrochemical‐Conditioning‐Free and Water‐Resistant Hybrid AlCl 3 /MgCl 2 /Mg(TFSI) 2 Electrolytes for Rechargeable Magnesium Batteries journal February 2019
Mg Cathode Materials and Electrolytes for Rechargeable Mg Batteries: A Review journal January 2019
Halogenid‐basierte Materialien und Chemie für wiederaufladbare Batterien journal January 2020
Synthesis and Application of Magnesium Diethylphosphate for Rechargeable Magnesium Battery journal January 2020
MgCl 2 /AlCl 3 electrolytes for reversible Mg deposition/stripping: electrochemical conditioning or not? journal January 2017
Solvent Effects on the Reversible Intercalation of Magnesium-Ions into V 2 O 5 Electrodes journal September 2018
Novel Design Concepts of Efficient Mg-Ion Electrolytes toward High-Performance Magnesium-Selenium and Magnesium-Sulfur Batteries journal January 2017
Stability of Tetraglyme for Reversible Magnesium Deposition from a Magnesium Aluminum Chloride Complex journal January 2019
The critical role of configurational flexibility in facilitating reversible reactive metal deposition from borohydride solutions journal January 2020
Computational Insights into Mg‐Cl Complex Electrolytes for Rechargeable Magnesium Batteries journal June 2019
Exploring the Synergy of LiBH 4 /NaBH 4 Additives with Mg(BH 4 ) 2 Electrolyte Using Density Functional Theory journal January 2018
Electrolyte dynamics in reversible metal electrodeposition for dynamic windows journal February 2018
Evaluation of (CF 3 SO 2 ) 2 N (TFSI) Based Electrolyte Solutions for Mg Batteries journal January 2015
Practical Stability Limits of Magnesium Electrolytes journal January 2016
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