Fig. 7: Capacity loss after extended cycling pauses.

Galvanostatic cycling combined with extended relaxation test of Prussian white—Hard carbon full-cells using the three electrolytes of 0.35 M NaBOB in TEP (orange triangles or diamonds), 0.35 M NaBOB in TEP + 3 wt% PES (blue triangles or diamonds) or 1 M NaPF₆ in EC:DEC 1:1 (black circles or diamonds). a Overview of the voltage profiles. The cells were cycled at 55 °C using 0.2 C rate, and relaxed for 100 h after charge number 10 and relaxed for 100 h after discharge number 20. b Corresponding charge and discharge capacities for the same cells. Open diamonds for charge capacities and filled diamonds for discharge capacities. c Calculated losses in the first discharge following the pause compared to the last discharge before the pause, for pauses at charged and discharged states, respectively. Irreversible loss (red) remains also in the second discharge after the pause whereas the capacity which is recovered in the next cycle (green) is the reversible loss that is only seen in the first discharge after the pause.