![]() Moreover, the redox activity of nitrate anions in the molten salt was found to be critical to enable the formation of Na 2O 2. Raman, pressure tracking and titration measurements were used to show that the dominant discharge product is Na 2O 2. In this study, we demonstrated a molten-salt Na–O 2 battery operating at 443 K with high areal energy (33 mW h cm −2 geo) and power densities (19 mW cm −2 geo), with high energy efficiency (∼90% at 5 mA cm −2 geo), and stable cycling (400 cycles with no capacity loss). Alkali metal–oxygen batteries can provide greater specific energy than Li-ion batteries but often suffer from low power density, cycleability, and energy efficiency due to the sluggish kinetics of the oxygen electrode and parasitic reactions at both the oxygen and alkali metal electrodes. ![]()
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