A ?60 ℃ Low-Temperature Aqueous Lithium Ion-Bromine Battery with High Power Density Enabled by Electrolyte Design

摘要

Aqueous lithium-ion batteries are normally limited at low temperatures,because of the consequent low conductivity of electrolytes and the sluggishkinetics of electrode materials. Herein, a high-performance ultra-low temperatureaqueous lithium ion-bromine battery (ALBB) realized by a tailoredfunctionalized electrolyte (TFE) consisting of lithium bromide and tetrapropylammoniumbromide (TPABr) is reported, which can maintain liquid statewith high conductivity (1.89 mS cm~（-1）) at ?60 ℃. In addition, with the help ofexcellent bromine-fixation of TPABr, the high reversible capacity can be providedby the fast redox reaction of Br2/Br- couple in the cathode from roomtemperature (RT) to ?60 ℃. Moreover, 1,4,5,8-naphthalenetetracarboxylicdianhydride-derived polyimide anode can deliver excellent low-temperaturecapacity retention as well as enhanced rate capability and reversibility atRT in TFE. As a result, the designed TFE can endow ALBB with high energydensities (98, 64, and 32 Wh kgdry-1 at RT, ?40, and ?60 ℃, respectively),outstanding power densities (24.6 and 1.2 kW kgdry-1 at RT and ?40 ℃,respectively), and superior capacity retentions (94 and 98 after running1000 cycles at RT and ?40 ℃, respectively). This work demonstrates a novelstrategy to widen the temperature range of aqueous batteries.