钒电池用含吡啶基杂萘联苯聚芳醚酮隔膜的研制

Preparation of pyridinium-containing poly(phthalazinoneether ketone) membrane for vanadium redox flow batteries

以含二甲基杂萘联苯聚芳醚酮为原料,通过控制溴化条件,得到了含溴甲基杂萘联苯聚芳醚酮,与吡啶反应得到可溶解的含吡啶基杂萘联苯聚芳醚酮(Py-PPEK),通过溶液浇铸法制得了含吡啶基阴离子交换膜。考察了离子交换容量(IEC)对Py-PPEK膜基本性能及电池性能的影响。研究结果表明,随着IEC的增加,Py-PPEK膜的吸水率和溶胀率增加,钒离子渗透系数和面电阻减小,钒电池的电流效率、电压效率和能量效率提高。在电流密度为40 mA/cm^(2)时,Py-PPEK30(IEC=0.41 mmol/g)膜的电流效率达到95.5%,优于Nafion115膜。

Brominated poly(phthalazinone ether ketone)is obtained from dimethyl-containing poly(phthalazinone ether ketone)by controlled bromination conditions,which are reacted with pyridine to obtain a soluble pyridinium-containing poly(phthalazinone ether ketone)(Py-PPEK).Py-PPEK anion-exchange membranes are produced from the polymers by a solution casting method.The effect of ion exchange capacity(IEC)on the basic performance of Py-PPEK membranes and cell performance is investigated.As the IEC increases,the water absorption and swelling rate of Py-PPEK membranes increase,but the vanadium ion permeability coefficient and surface resistance decrease,and the current efficiency,voltage efficiency and energy efficiency of VRB increase.At a current density of 40 mA/cm^(2),the current efficiency of Py-PPEK30(IEC=0.41 mmol/g)membrane reaches 95.5%,which is better than that of Nafion115 membrane.