Bifunctional electrolyte additive MgI for improving cycle life in high-efficiency redox-mediated Li-O batteries.
作者信息
Li Wei, Sheng Chuanchao, Wang Lei, Sun Xinyi, Mu Xiaowei, He Ping, Zhou Haoshen
机构信息
Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China.
出版信息
Chem Commun (Camb). 2023 Aug 17;59(67):10141-10144. doi: 10.1039/d3cc02847j.
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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