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Recent Developments of
Ferrate (VI) Salts as Cathode Meterial in High Capacity Batteries
Yuan Zhongzhi1,2, Zhou
Zhentao1, Li Weishan2 (1 Institute of Material Science and Engineering, South China University of Technology, Guangzhou 510641 2 Chemistry Department, South China Normal University, Guangzhou 510631) Abstract The ferrate (VI) salts that have Fe element in an unusual VI valence state may be one of the best choices of high-energy batteries' cathode material, because ferrates (VI) are capable of the three-electron reduction, their reduction and decomposition products are nontoxic and environment-benign. One and a half century after the K2FeO4 synthesis, the chemistry and electrochemistry remains relatively unknown because of the incorrect knowledge of ferrates (VI) instability. The studies of ferrates (VI) used as cathode have been renewed recently. Many achievements have been made after the Israeli scientist Dr. Stuart Licht published their results on Science magazine that the alkaline ferrate (VI)/Zn batteries can provide 50% higher capacity than conventional alkaline batteries. In this article, the reasons of ferrate (VI) salts’ instability, methods of avoiding ferrate (VI) salts' decomposition and influences of some modifiers such as SrTiO3, Co2O3，MnO2，In2O3，KMnO4, (CFx)n on electrochemical characteristics of ferrate (VI) cathode are reviewed. Key words Ferrate(VI) cathode, Alkaline battery, Cathode modifiers
铁(VI)酸盐正极材料的研究进展** 袁中直1,2 周震涛1
李伟善2 摘要 铁(VI)酸盐中的Fe具有不寻常的高价态+6价，可以进行3电子还原放电反应，其还原产物及分解产物无毒无害，具有新一代“绿色电池”的重要特征。铁(VI)酸盐合成一个半世纪以来，由于认为它不稳定至今其化学和电化学性质并不很清楚。直到1999年以色列科学家Licht博士在Science上发表研究结果表明铁(VI)酸盐/Zn电池可以获得比常规碱性电池多50%的容量，铁(VI)酸盐高能电池才又引起深入的研究。本文综述了近年来铁(VI)酸盐作为高能电池正极活性物质的研究进展，包括改善铁(VI)酸盐稳定性的方法、掺杂修饰(如SrTiO3,
Co2O3，MnO2，In2O3，KMnO4，(CFx)n等)等改善铁(VI)酸盐正极电化学性能的技术等。 袁中直 男，36岁，副教授，博士生，从事应用电化学研究。
E-mail:yuanzz@scnu.edu.cn |