Anode

Lithium Metal Anode

Lithium Metal

Insights into soft short circuit-based degradation of lithium metal batteries Research by S. Menkin, et al. extensively explored the detection of soft shorts during lithium plating. The paper seeks a more nuanced understanding of voltage traces and impedance variations in lithium metal batteries, which has historically correlated squarelike waveforms with uniform plating and stripping. The authors propose redefining the critical current density based on reversible soft shorts observed in symmetric cell polarization experiments across both ether and carbonate based liquid electrolytes.

Operando Li NMR and impedance (GEIS) measured at 8 Hz intensities measured during unidirectional Li plating at 1 mA cm-2 in an NMR in situ cylindrical symmetrical Li cell with LP30 electrolyte.

Combining EIS and NMR experimental approaches, reversibility of soft shorts and their evolution into hard shorts can be characterized and predicted.

Academia | P. 214 Source: S. Menkin, J. Fritzke, R. Larner, C. de Leeuw, Y. Choi, A. B. Gunnarsdottir, and C. P. Grey

Soft short-circuits exhibit resistances in the tens to hundreds of ohms, compared to hard short-circuits, whose resistance typically falls in the milli-ohm range.

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