Extended Data Fig. 4: Discharge capacity retention.
From: Reversible Mn2+/Mn4+ double redox in lithium-excess cathode materials
The 60:30:10 Li2Mn2/3Nb1/3O2F: carbon black:PTFE electrode was cycled between 1.5 V and 5.0 V at room temperature at 10, 20, 40, 100, 200, 400 and 1,000 mA g−1. A faster rate leads to less capacity fading during the initial 25 cycles. This is likely to be due to electrolyte decomposition per cycle occurring more (less) at a high voltage in a slower (faster) cycling test, which increases the impedance of a cell by creating a resistive surface layer and decreasing the ionic conductivity of the electrolyte.
