Fig. 6.
Electrochemical performance of cells assembled by Li foils with a GZCNT interfacial layer. a–d Comparison of the cyclability of a symmetric cell assembled by blank Li foils (red), and Li foils with interfacial layers of CNT (blue), and GZCNT (gold) at current densities of a 1, b 5, and c 10 mA cm–2 with a stripping/plating capacity of 1 mAh cm–2 for a 520, b 325, and c 520 cycles, and d at 1 mA cm–2 with 5 mAh cm–2 capacity for 50 cycles. e Electrochemical impedance spectra of pristine and post-500-cycle (at 1 mA cm–2 with a charging/discharging capacity of 1 mAh cm–2) cells assembled by Li foils with CNT and GZCNT interfacial layers. Frequency: 0.1 Hz–1 MHz, perturbation amplitude: 5 mV, measured at 0% SOC. f Summary of RSEI fitting results of pristine and post-500-cycle cells