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Reducing Mg Anode Overpotential via Ion Conductive Surface Layer Formation by Iodine Additive

Journal Article · · Advanced Energy Materials
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [2]
  1. Univ. of Maryland, College Park, MD (United States); South China Univ. of Technology (SCUT), Guangzhou (China)
  2. Univ. of Maryland, College Park, MD (United States)
  3. South China Univ. of Technology (SCUT), Guangzhou (China)

Electrolytes that are able to reversibly deposit/strip Mg are crucial for rechargeable Mg batteries. The most researched complex electrolytes based on Lewis acid-base chemistry are expensive, difficult to be synthesized, and show limited anodic stability. Conventional electrolytes using simple salts such as Mg(TFSI)2 can be readily synthesized, but Mg deposition/stripping in these simple salt electrolytes is accompanied by a large overpotential due to the formation of a surface layer on the Mg metal with a low Mg ion conductivity. In this work, the overpotential for Mg deposition/stripping in a simple salt, Mg(TFSI)2-1,2-dimethoxyethane (DME), electrolyte is significantly reduced by adding a small concentration of iodine (≤50 × 10–3m) as an additive. Mechanism studies show that an Mg ion conductive solid MgI2 layer is formed on the surface of the Mg metal and acts as a solid electrolyte interface. With the Mg(TFSI)2-DME-I2 electrolyte, a very small voltage hysteresis is achieved in an Mg-S full cell.

Research Organization:
Univ. of Maryland, College Park, MD (United States). Energy Frontier Research Center (EFRC) Nanostructures for Electrical Energy Storage (NEES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001160
OSTI ID:
1469930
Alternate ID(s):
OSTI ID: 1402538
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 7 Vol. 8; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Opportunities and Challenges in the Development of Cathode Materials for Rechargeable Mg Batteries journal December 2018
Extending Cycle Life of Mg/S Battery by Activation of Mg Anode/Electrolyte Interface through an LiCl‐Assisted MgCl 2 Solubilization Mechanism journal December 2019
A Stable Solid Electrolyte Interphase for Magnesium Metal Anode Evolved from a Bulky Anion Lithium Salt journal December 2019
Designing Low Impedance Interface Films Simultaneously on Anode and Cathode for High Energy Batteries journal May 2018
Halogenid‐basierte Materialien und Chemie für wiederaufladbare Batterien journal January 2020
Halide‐Based Materials and Chemistry for Rechargeable Batteries journal January 2020
Scalable Synthesis of an Artificial Polydopamine Solid‐Electrolyte‐Interface‐Assisted 3D rGO/Fe 3 O 4 @PDA Hydrogel for a Highly Stable Anode with Enhanced Lithium‐Ion‐Storage Properties journal January 2019
A Review of Advanced Energy Materials for Magnesium-Sulfur Batteries journal September 2018
Rechargeable Magnesium Batteries using Conversion-Type Cathodes: A Perspective and Minireview journal July 2018
Rechargeable Zn–MnO 2 batteries: advances, challenges and perspectives journal January 2020
Dendrite Growth in Mg Metal Cells Containing Mg(TFSI) 2 /Glyme Electrolytes journal January 2018

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