RESEARCH STATUS AND PROSPECT OF ELECTROLYTES FOR 3.5 VALENCE ALL-VANADIUM FLOW BATTERIES
Vanadium flow battery due to its inherent safety,more than 10 years of service life,adaptable to large-scale applications and easy recycling advantages,as the most promising large-scale energy storage technology has been unprecedented developed,it is expected that by 2030 the domestic total vanadium flow battery installed capacity will reach 93 GWh.Vanadium battery is mainly composed of electrolyte,stack and conveying system,electrolyte cost accounts for more than 40％of the total cost of the battery,its low-cost and efficient preparation technology is the key to the large-scale commercial development of vanadium battery.The main preparation methods of vanadium electrolyte include chemical reduction method,electrolysis method,solvent extraction method and ion exchange method.The chemical reduction method is based on the chemical reduction of V2O5 and ammonium vanadate as raw materials to prepare the electrolyte.The process is mature,but there are some problems such as reducing agent residue and high raw material cost.The electrolysis process is short,but the overall energy consumption is high and the electrolytic efficiency is low.Ion exchange method and solvent extraction method usually use vanadium containing leaching solution as raw material,without vanadium product preparation,but the process is still complicated,and it is difficult to directly obtain 3.5 valence vanadium electrolyte.The preparation methods of 3.5 valence electrolyte in recent years were summarized,the principle,process flow and advantages and disadvantages of each method were summarized,in order to provide reference for the development of new preparation technology of 3.5 valence electrolyte.
all-vanadium flow battery3.5 valencevanadium electrolytelarge-scale energy storagechemical reductionelectrolysis
万方数据
维普
