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Article Abstract
Here, MgI is introduced as a bifunctional self-defense redox mediator into dimethyl sulfoxide-based Li-O batteries. During charging, I is first oxidized to I, which facilitates the decomposition of LiO, and thus reduces overpotential. In addition, Mg spontaneously reacts with the Li anode to form a very stable SEI layer containing MgO, which can resist the synchronous attack by the soluble I and improve the interface stability between the Li anode and the electrolyte. Therefore, a Li-O battery containing MgI exhibits an extended cycling life span (400 cycles) and a quite low overpotential (0.6 V).
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