期刊
ELECTROCHIMICA ACTA
卷 414, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.140213
关键词
Magnesium electrolyte; Lithium iodide additive; Mg[AlCl4](2); Conditioning free; Rechargeable magnesium batteries
资金
- National Natural Science Foundation of China [21773291, U1832218, 22002102, 61904118]
- Natural Science Foundation of Jiangsu [BK20190935, BK20190947]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJA210005]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_2588]
- Nantong Basic Science Research Plan [JC2021003]
- Inner Mongolia Autonomous Region Key Laboratory of Nanocarbon Materials [MDK2019008]
- Jiangsu Key Laboratory for Environment Functional Materials
In this study, a LiI-assisted Mg surface chemistry was used to reduce the overpotential of Mg plating/stripping through in situ solubilization mechanism and ion conductive surface layer formation mechanism. By adding LiI to the electrolyte, the overpotential of Mg plating/stripping was remarkably reduced, leading to the successful formulation of a new conditioning-free Mg electrolyte system.
Developing a simple and reliable strategy for modulating overpotential of Mg plating/stripping is crucial for realizing overall high performance of rechargeable Mg batteries, which have been demonstrated to be rather challenging. Herein, we report a facile LiI-assisted Mg surface chemistry to reduce Mg plating/stripping over potential via in situ solubilization mechanism and ion conductive surface layer formation mechanism. As a result, we successfully formulate a new conditioning-free Mg[AlCl4](2)-based Mg electrolyte system that improves Mg plating/stripping from the very first cycle. The overpotential of Mg plating/stripping of the as-prepared electrolyte with a LiI electrolyte additive is remarkably reduced to 240/240 mV at a current density of 1000 mu A cm(-2). Using this electrolyte, a rechargeable Mg battery coupled with PANi intercalated V2O5 (V2O5-PANi) cathode and Mg anode delivers a stable discharge specific capacity of nearly 50 mA h g(-1) after an impressively prolonged cycle life of 500 cycles. Our finding provides a new inspiration of in situ Mg surface chemistry to activate Mg anode surface with high Mg ion conductivity.
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