Ammonium bromide is an inorganic electrolyte additive used in halogen-free magnesium-sulfur battery electrolytes, which serves dual functions as a regulator and a resistance-reducing agent. Ammonium bromide effectively optimizes the interfacial reaction kinetics of batteries by guiding the uniform deposition of magnesium, reducing the activation energy for magnesium ion transport, and decreasing the stripping/deposition overpotential. Ammonium bromide significantly enhances the cycle life and initial discharge capacity of magnesium-sulfur batteries[1].
