LAUSR

Abstract Metal halides have become the research topic of battery due to their high energy density. In our work, we synthesized ethylene glycol cyclic sulfate (egcs) as the electrolyte solvent through a simple one-step hydrothermal reaction, and for the first time proposed a new non-toxic rechargeable copper bromide (CuBr2) battery with a complete system. After testing, the specific capacity of the CuBr2-battery with the electrolyte of this system can reach 200 mAh gcb-1 at the charging and discharging current density of 2 A g-1. The specific capacity can still reach 142 mAh gcb-1 after 8000 cycles. In addition, the reaction mechanism of CuBr2-battery was verified by XPS, IR, MS and XRD characterization.