Fig. 1: Comparison of SOCl2 and organic solvent-based electrolytes for rechargeable Na–Cl2 battery.
From: Harnessing organic electrolyte for non-corrosive and wide-temperature Na-Cl2 battery
a Comparison of the theoretical specific energy of state-of-the-art Na and Li metal batteries7,8,9,10,11,12,13,14,15. The theoretical specific energy of Na–S, Na–O2, Na–I2 and Na–Cl2 batteries are calculated based on Na2S, NaO2, I2, and NaCl, respectively. More details are provided in Supplementary Table 1. b Photograph of a broken Na–Cl2 pouch cell with the leakage of SOCl2 electrolyte on a fresh leaf, leading to severe corrosion and toxic gas releasing. c Schematic illustration of the rechargeable Na–Cl2 battery based on an electrolyte comprised of AlCl3, NaFSI, and SOCl2. The high corrosivity and inferior thermal stability of SOCl2 demands alternatives such as organic solvents, but their compatibility with AlCl3 requires rational molecular structure design.
