Fig. 2: Electrochemical measurements of KFeC2O4F in K half-cells.
From: A fluoroxalate cathode material for potassium-ion batteries with ultra-long cyclability
a CV curves in different cycles at a scan rate of 0.1 mV s−1. b Galvanostatic charge–discharge curves at different current densities of 0.1–0.5 A g−1. c Rate performance under different current densities. d Cycling performance at 0.2 A g−1 for 2000 cycles, and e the corresponding charge-discharge curves of diverse cycles, and f medium discharge voltages. Inset of f is the charge–discharge curves for the final 30 cycles. g The comparison of cycling stability between our work and recently reported cathode materials (detailed in Supplementary Table 2) for potassium-ion batteries.
