Fig. 5: Cycling stability of SiO|NCM cells.

a Discharge capacities of SiO|NCM 523 cells at a current density of 1.0 mA cm−2 and the Coulombic efficiency of the cell incorporating the elastic GPE. b, c Voltage profiles of the SiO|NCM 523 cells with (b) and without (c) the elastic GPE. Pre-cycled SiO electrodes were used for full-cell assembling. The mass loading of SiO anodes is 4.7 mg cm−2, and the copolymer amount is 0.4 mg cm−2.