Fig. 3: Electrochemical response during lithiation or sodiation.
From: Identifying critical features of iron phosphate particle for lithium preference
a, b 1st electrochemical cycle under 17 mA/g (equivalent to 0.1 C based on theoretical capacity of LiFePO4) in 60 ml 1 M LiCl aqueous solution (paired with Ag/AgCl/KCl (4.0 M) reference and LixFePO4 counter electrodes). c, d 1st electrochemical cycle under 15.4 mA/g (equivalent to 0.1 C based on theoretical capacity of NaFePO4) in 60 ml 1 M NaCl aqueous solution (paired with Ag/AgCl/KCl (4.0 M) reference and NayFePO4 counter electrodes). e Bar chart comparisons of end potential collected right after different depth-of-discharge (DOD) in 60 ml 1 M LiCl (left panel) or NaCl (right panel) aqueous solution, which corresponds to the value at the bottom of the bar, and open-circuit potential after 20 h of relaxation without currents, corresponding to the value at the top of the bar. See Methods for electrode preparation and DOD calculation. The dashed lines denotes the calculated thermodynamic voltage for specific reactions (See Supplementary Note 1 for computation details).
