Fig. 3: Electrochemical performance of selected bi-phasic materials in Na-ion half cells.
From: Manipulating O3/P2 phase ratio in bi-phasic sodium layered oxides via ionic radius control
Voltage profile for the first cycle of a Na72Ti1Cu1 (2.3–4.2 V) and b Na75Ti1Al1 (2.2–4.2 V) cycled in a half cell against Na/Na+ at a specific current of 25 mA g−1. c Cycling stability showing the specific discharge capacities and discharge energy densities based on the mass of the active positive electrode material across 50 cycles. d Discharge capacities resulting from rate capability testing of Na72Ti1Cu1 and Na75Ti1Al1 at specific currents of 25, 50, 100, 250, and 500 mA g−1.
