Exploiting a high-performance magnesium-fluoride battery prototype enabled by anion-receptor-mediated electrolyte

batteries exhibit the high reversible capacities in a wide temperature range, delivering 354 mAh g⁻¹ at 25 °C and 177 mAh g⁻¹ at -20 °C. Moreover, the high reversibility over 500 cycles with a low capacity decay rate of 0.054% per cycle can be realized when confined to intercalation chemistry. This work provides an anion receptor-based electrolyte design strategy that expands positive material horizons for magnesium batteries to high-energy fluorides.