LAUSR

A hybrid electrolyte based on low concentration sodium nitrate with glycerol as an additive is proposed for aqueous sodium-ion batteries (ASIBs) towards low temperature performances. Based on this dilute hybrid electrolyte and configured by bimetallic Prussian blue analogues (Ni 2 ZnHCF) cathode and 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) anode, the full cell demonstrates surprising cycle performance with a specific capacity of 60 mAh g -1 (>800 cycles) and achieves prominent performance at low temperature. Glycerol effectively expands the electrochemical stability window of the hybrid electrolyte to 2.7 V from formation of strong hydrogen bonds with water molecules and realizes the operation of the cell at low temperature, delivering a stable reversible capacity of 40 mAh g -1 at -10 °C. The hybrid electrolyte of glycerol-water provides a new alternative in development of low-cost, long-lifespan and low-temperature for ASIBs and other aqueous battery systems.