大化所开发溴基液流电池新体系

Core Insights - A new bromine-based two-electron transfer reaction system has been developed, enabling the concept validation and system scaling of long-life zinc-bromine flow batteries [1][2] - The new reaction significantly improves energy density and reduces corrosion, addressing key challenges in traditional bromine flow battery systems [1][2] Group 1: Research and Development - The research team, led by Li Xianfeng from the Dalian Institute of Chemical Physics, has published their findings in the journal Nature Energy [1] - The new bromine flow battery relies on the redox reaction between bromide ions (Br-) and bromine (Br2), which has advantages such as abundant resources, high electrode potential, and high solubility [1] Group 2: Technical Innovations - The introduction of amine compounds as bromine scavengers effectively lowers the concentration of bromine in the electrolyte, enhancing battery performance [1] - The dual-electron transfer method from Br- to Br+ (brominated amine compounds) significantly increases the energy density of the battery [1] Group 3: Performance Metrics - In a scaled-up 5 kW system test, the battery demonstrated stable operation for over 700 cycles at 40 mA/cm², with a total lifespan exceeding 1400 hours and an energy efficiency of over 78% [2] - The extremely low concentration of bromine resulted in no corrosion of key materials such as current collectors, electrodes, and membranes before and after cycling, confirming the non-corrosive nature of the electrolyte [2] Group 4: Implications for Industry - This research provides a new approach for the design of long-life bromine flow batteries, laying the groundwork for further applications and promotion of zinc-bromine flow batteries [2]