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Solid electrolyte interphase formation by propylene carbonate reduction for lithium anode

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Abstract

The naturally formed solid electrolyte interphase (SEI) of lithium (Li) with organic electrolytes is fragile and can result in repeated exposure of fresh Li metal to the electrolyte during plating/stripping cycles. Building an artificial SEI layer is an effective way to enhance its stability and improve the electrochemical deposition behavior of Li. Using non-Li metal substrate to construct Li metal electrode is a more applicable method than using direct Li metal anode. In this study, the possibility of electrochemical reduction of propylene carbonate (PC) as an artificial SEI formation reaction for Li metal anode was evaluated. The results show that PC reduction can be divided into two stages: in the potential region higher than 0.85 V (vs. Li/Li+), the soluble free radical anion CH3–ĊH–CH2–OCO2 is formed and can be re-oxidized. In the potential region between 0.85 and 0.55 V (vs. Li/Li+), the insoluble reduction products CH3CH(–OCO2Li)CH2–OCO2Li and Li2CO3 are formed and construct the SEI film. By controlling the PC reduction rate with limited current, the morphology and construction of the SEI film could be improved, and thus the Li plating/stripping cycling efficiency could be enhanced. This can be considered a fundamental concept for high quality artificial SEI formation.

Graphical abstract: Solid electrolyte interphase formation by propylene carbonate reduction for lithium anode

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Publication details

The article was received on 18 Jul 2017, accepted on 05 Oct 2017 and first published on 05 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP04839D
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Solid electrolyte interphase formation by propylene carbonate reduction for lithium anode

    Q. Qian, Y. Yang and H. Shao, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP04839D

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