Reducing Mg Anode Overpotential via Ion Conductive Surface Layer Formation by Iodine Additive
- Univ. of Maryland, College Park, MD (United States); South China Univ. of Technology (SCUT), Guangzhou (China)
- Univ. of Maryland, College Park, MD (United States)
- 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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