A Desolvation-Free Sodium Dual-Ion Chemistry for High Power Density and Extremely Low Temperature

The development of conventional rechargeable batteries based on intercalation chemistry in the fields of fast charge and low temperature is generally hindered by the sluggish cation-desolvation process at the electrolyte/electrode interphase. To address this issue, a novel desolvation-free sodium dual-ion battery (SDIB) has been proposed by using artificial graphite (AG) as anode and polytriphenylamine (PTPAn) as cathode. Combining the cation solvent co-intercalation and anion storage chemistry, such a SDIB operated with ether-based electrolyte can intrinsically eliminate the sluggish desolvation process. Hence, it can exhibit an extremely fast kinetics of 10 Ag-1 (corresponding to 100C-rate) with a high capacity retention of 45 %. Moreover, the desolvation-free mechanism endows the battery with 61 % of its room-temperature capacity at an ultra-low temperature of -70 degrees C. This advanced battery system will open a door for designing energy storage devices that require high power density and a wide operational temperature range.

Automated summary

The novel desolvation-free sodium dual-ion battery (SDIB) with artificial graphite anode and polytriphenylamine cathode shows exceptional performance in fast charging, low-temperature operation, high power density, and wide temperature range. This advanced battery system opens up new possibilities for designing energy storage devices in the future.