Fig. 7: Evolution of the Li–Sn alloy 7Li NMR signal upon charge. | Nature Communications

Fig. 7: Evolution of the Li–Sn alloy 7Li NMR signal upon charge.

From: Origins of lithium inventory reversibility with an alloying functional layer in anode-free lithium metal batteries

Fig. 7

Voltage profile of the Sn@Cu||NMC622 NMR pouch cell with constant current operation and operando (I–VII) 7Li NMR spectra and intermediate resting periods for acquisition of in situ (A–G) 7Li NMR spectra during charge. The acquisition parameters of an operando 7Li NMR experiments yield an acquisition time of 30 min, over which all dynamic processes are averaged. This results in acquisition of four spectra per polarization period. The longer recycle delay of an in situ spectrum at open circuit voltage enables to also detect slowly relaxing species but increases the acquisition time to 2 h and 19 min.

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