低成本超薄复合膜用于不同溶液体系钒电池的性能研究

Study on the performance of low cost ultra thin composite membrane for different electrolyte of vanadium redox flow battery systems

采用廉价的聚烯烃微孔膜作为支撑体,全氟磺酸离子交换树脂作为复合相,设计并制备了成本低、机械强度高、性能优异的超薄液流电池复合膜.研究了在H 2SO 4和HCl不同体系下复合膜的氢离子传导、钒离子渗透、电池性能.结果表明,25μm复合膜具有较高的机械强度和较低的溶胀率;在混酸钒溶液体系(1.5 mol/L VOSO 4+1.5 mol/L H 2SO 4+2.5 mol/L HCl)的电池性能优异,100 mA/cm^2下能量效率(EE)为80%.同时,复合膜成本较低(40~60元/m^2),具有应用前景.

All vanadium redox flow battery(VRFB)is one of the most feasible large-scale energy storage technologies for renewable power generation of wind and solar power.The development of low-cost and high-performance membrane is the focus of VRFB research and engineering.The mixed acid(H 2SO 4+HCl)vanadium solution system has showed practical feasibility in improving battery performance and expandingoperating temperature range.The performance of the membrane in different vanadium electrolyte need to be studied to accelerate energy storageapplication of VRFB.In this paper,with commercial and cheap polyolefin microporous membrane as support and perfluorosulfonic acid ion exchange resin as composite phase,a new type of ultra-thin composite membrane for VRFB was designed and prepared.The ion conduction,vanadium ion permeation and battery performance in different systems of sulfuric acid and hydrochloric acid were studied.The results show that the composite membrane represented high mechanical strength and low swelling rate.The battery performance of the composite membrane in the mixed solution of sulfuric acid and hydrochloric acid is excellent:100 mA/cm^2,EE 80%.At the same time,the composite membrane has a lower cost(only 40~60 yuan/m^2).This low cost,high performance composite membrane showed a promising prospect for VRFB application.