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Issue 4, 2015
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Operando electron paramagnetic resonance spectroscopy – formation of mossy lithium on lithium anodes during charge–discharge cycling

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Abstract

The formation of mossy lithium and lithium dendrites so far prevents the use of lithium metal anodes in lithium ion batteries. To develop solutions for this problem (e.g., electrolyte additives), operando measurement techniques are required to monitor mossy lithium and dendrite formation during electrochemical cycling. Here we present a novel battery cell design that enables operando electron paramagnetic resonance (EPR) spectroscopy. It is shown that time-resolved operando EPR spectroscopy during electrochemical cycling of a lithium-metal/LiFePO4 (LFP) cell provides unique insights into the lithium plating/dissolution mechanisms, which are consistent with ex situ scanning electron microscopy (SEM) analysis. To demonstrate the viability of the operando EPR method, two cells using different electrolytes were studied. When using an electrolyte containing fluoroethylene carbonate (FEC) additive, a higher reversibility of the lithium anode and reduced formation of micro-structured (mossy/dendritic) lithium were observed.

Graphical abstract: Operando electron paramagnetic resonance spectroscopy – formation of mossy lithium on lithium anodes during charge–discharge cycling

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Publication details

The article was received on 27 Aug 2014, accepted on 13 Feb 2015 and first published on 16 Feb 2015


Article type: Paper
DOI: 10.1039/C4EE02730B
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Citation: Energy Environ. Sci., 2015,8, 1358-1367
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    Operando electron paramagnetic resonance spectroscopy – formation of mossy lithium on lithium anodes during charge–discharge cycling

    J. Wandt, C. Marino, H. A. Gasteiger, P. Jakes, Rüdiger-A. Eichel and J. Granwehr, Energy Environ. Sci., 2015, 8, 1358
    DOI: 10.1039/C4EE02730B

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