Figure 4
From: New-concept Batteries Based on Aqueous Li+/Na+ Mixed-ion Electrolytes

The Na0.44MnO2/TiP2O7 mixed-ion battery.
(a), A schematic of the battery. (b), Charging-discharging curves at a rate of 0.4 C in 1 M Na2SO4 + 0.25 M Li2SO4. (c), Charging-discharging curves at a rate of 0.4 C in 1 M Na2SO4 + 0. 125 M Li2SO4. (d), Cycle life tests of the battery at a rate of 0.4 C in mixed electrolytes. (1 C = 60 mAh g−1).