Figure 7.

(a) Galvanostatic cycling of in situ Cu-LFP cells using d-HCl-Cu where a current of 0.1 mA cm^–2 was used for the first cycle and 0.5 mA cm^–2 for subsequent cycles; plating and stripping were performed for a constant capacity of 1 mAh cm^–2. (b) In situ⁷Li NMR spectra obtained under galvanostatic cycling for d-HCl-Cu. (c) The intensity detected by NMR of the Li metal resonance, integrated over the 220–300 ppm region, the intensity being normalized to the intensity of the Li metal signal obtained on the first charge (indicated by an asterisk). (d) Coulombic efficiency for Li plating on d-HCl-Cu.