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Bifunctional electrolyte additive KI to improve the cycling performance of Li-O2 batteries†

Abstract

Non-aqueous rechargeable Li-O2 batteries have attracted great attentions owing to their ultra-high specific energy densities. However, the high charge overpotential and the interfacial stability of lithium anodes still need to be overcome before the practical application of Li-O2 batteries. Here, we use KI as a bifunctional electrolyte additive for Li-O2 batteries. The results demonstrate that I could act as a redox mediator to effectively reduce the charge overpotential by 0.7 V. On the other hand, the introduction of K+ contributes to decreasing the polarization, optimizing the morphology, reducing the surface by-products of lithium anode and dramatically improving the uniform distribution of discharge products on the cathode surface. The dual functions of KI additive thus successfully boost the electrochemical performances of Li-O2 batteries.

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Publication details

The article was received on 12 Jun 2018, accepted on 09 Sep 2018 and first published on 10 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ02910E
Citation: New J. Chem., 2018, Accepted Manuscript
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    Bifunctional electrolyte additive KI to improve the cycling performance of Li-O2 batteries†

    C. Li, Z. Qian, Y. Ma, P. Zuo, C. Du, H. Huo and G. Yin, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02910E

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