Figure 1
From: New-concept Batteries Based on Aqueous Li+/Na+ Mixed-ion Electrolytes

Schematics of Li+/Na+ mixed-ion battery.
Lithium-intercalation compounds and sodium-intercalation compounds are used for anode and cathode, respectively. During charging (or discharging), the storage (or release) of Li+ takes place at anode and the release (or storage) of Na+ occurs at cathode.