碱性高铁电池的初步研究

Preliminary study on the super-iron battery

采用测试实验电池性能的方法 ,对几种可能用于碱性高铁电池的金属负极、隔膜、集流体材料进行了初步研究。结果表明 :作为可充电电池Fe MFeO4(M表示金属 ,下同 )和Cd MFeO4体系较Zn MFeO4体系进入实际应用的可能更大。有还原性的隔膜高分子材料及电液中的还原性杂质与高铁酸盐之间的氧化还原反应 ,导致高铁酸盐正极稳定性和放电容量的降低 ,杂质ZnO和Fe(OH) 3 对固体高铁酸盐的分解也有催化作用 ,在所研究的隔膜材料中 ,辐射接枝聚乙烯微孔膜和改性聚丙烯微孔膜的效果较好。以碳纤维编织布作为高铁酸盐正极的集流体较金属集流体有利于高铁酸盐的稳定。实现难溶高铁酸盐的规模化、低成本生产 。

The materials, which is possible to be used in alkaline super iron battery as metal cathode, separator and current collector, were studied preliminarily by testing the cycling performance and self discharge features of experimental batteries with indissoluble ferrate (Ⅵ) as cathode. The results show that the Fe MFeO 4 and Cd MFeO 4 M indicates metal systems are more possible to be applied in rechargeable batteries than the Zn MFeO 4 system. The stability and discharge capacity of ferrate (Ⅵ) is decreased by the redox reaction among the reductive polymer separator, the reductive impurity in electrolyte and the ferrate (Ⅵ). The ZnO and Fe(OH) 3 impurities also have catalytic function to the decomposition of ferrate (Ⅵ). The micro porous membrane of radiation branched polyethylene (MPE) and polypropylene (MPP) membrane are proved to be the suitable separator material for super iron battery. Compared with the metal current collector, the fabric of carbon fiber as current collector is more suitable because it is favorable to the stability of ferrate (Ⅵ). Progress on structure reversibility of indissoluble ferrate (Ⅵ) in alkaline solution during charge/discharge cycles and the technology of manufacturing ferrate (Ⅵ) in commercial scale with low cost are the key problems to be solved for promote super iron battery into practice application.