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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States). Energy Frontier Research Center (EFRC) Nanostructures for Electrical Energy Storage (NEES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1469930
Alternate Identifier(s):
OSTI ID: 1402538
Grant/Contract Number:  
SC0001160; DESC0001160
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 8; Journal Issue: 7; Related Information: NEES partners with University of Maryland (lead); University of California, Irvine; University of Florida; Los Alamos National Laboratory; Sandia National Laboratories; Yale University; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; electrochemistry; iodine additive; Mg(TFSI)2‐DME simple salt electrolyte; reduce overpotential; sulfur

Citation Formats

Li, Xiaogang, Gao, Tao, Han, Fudong, Ma, Zhaohui, Fan, Xiulin, Hou, Singyuk, Eidson, Nico, Li, Weishan, and Wang, Chunsheng. Reducing Mg Anode Overpotential via Ion Conductive Surface Layer Formation by Iodine Additive. United States: N. p., 2017. Web. doi:10.1002/aenm.201701728.
Li, Xiaogang, Gao, Tao, Han, Fudong, Ma, Zhaohui, Fan, Xiulin, Hou, Singyuk, Eidson, Nico, Li, Weishan, & Wang, Chunsheng. Reducing Mg Anode Overpotential via Ion Conductive Surface Layer Formation by Iodine Additive. United States. doi:10.1002/aenm.201701728.
Li, Xiaogang, Gao, Tao, Han, Fudong, Ma, Zhaohui, Fan, Xiulin, Hou, Singyuk, Eidson, Nico, Li, Weishan, and Wang, Chunsheng. Tue . "Reducing Mg Anode Overpotential via Ion Conductive Surface Layer Formation by Iodine Additive". United States. doi:10.1002/aenm.201701728. https://www.osti.gov/servlets/purl/1469930.
@article{osti_1469930,
title = {Reducing Mg Anode Overpotential via Ion Conductive Surface Layer Formation by Iodine Additive},
author = {Li, Xiaogang and Gao, Tao and Han, Fudong and Ma, Zhaohui and Fan, Xiulin and Hou, Singyuk and Eidson, Nico and Li, Weishan and Wang, Chunsheng},
abstractNote = {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.},
doi = {10.1002/aenm.201701728},
journal = {Advanced Energy Materials},
number = 7,
volume = 8,
place = {United States},
year = {2017},
month = {10}
}

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