ACT/SGER: Development of Nanoparticulate Coatings for Fe(VI) Ferrate Batteries

需要开发提供比目前可用的能量更高的能量的先进电池材料。由于在这些材料中发生的3-电子转移，高铁酸盐阴离子（FeO 4）的盐可以用于此目的。然而，迄今为止，高铁酸盐的应用受到化学不稳定性和3-电子转移利用不充分的限制。在早期的研究中，我们已经开发了高铁酸盐合成和高铁酸盐纯度测定的标准程序。高铁酸盐在各种电解质中的不稳定性研究已经开始，并将在本项目期间继续进行。该项目的重点是通过在各种高铁酸盐上涂覆纳米颗粒氧化物薄膜来提高其稳定性，使用与阿贡国家实验室合作成功应用于改善锂基阴极材料的充电特性的技术。将测量用作阴极的涂覆的高铁酸盐盐的选定性质，并且将评估它们相对于锌和锂阳极的电化学行为。阿贡国家实验室和Rayovac公司的研究人员都将协助进行所需的电化学表征。目前可用的电池在它们可以存储的能量和它们可以传递给电子设备的功率方面都是有限的。高度氧化的铁材料，称为高铁酸盐，提供了改进电池设计和性能的可能性。然而，迄今为止的研究表明，高铁酸盐在长期储存过程中并不稳定，它们在实践中提供的能量远远低于理论极限。 在这个项目中，我们将尝试通过应用极薄的纳米颗粒氧化物涂层来控制与其他电池材料的相互作用，从而提高高铁酸盐材料的稳定性，这些材料会损害高铁酸盐的完整性和性能。该项目的成功完成可能会导致生产可充电电池，提供比目前电池设计更多的能量和功率。 数学和物理科学局的打击恐怖主义办法方案支持基础研究和劳动力发展方面的新概念，这些概念有可能促进国家安全。

There is a need to develop advanced battery materials that provide higher energies than are available at present. Salts of the ferrate anion (FeO4) could serve this purpose because of the 3-electron transfer that occurs in these materials. To date, however, applications of ferrates are limited by chemical instability and incomplete utilization of the 3-electron transfer. In earlier studies, we have developed standard procedures for ferrate synthesis and determination of ferrate purity. Studies of ferrate instability in various electrolytes have been initiated and will continue during this project. The focus of this project is on improving the stability of various ferrate salts by coating them with thin films of nanoparticulate oxides, using techniques that have been successfully applied to improve the recharge characteristics of lithium-based cathode materials in collaboration with Argonne National Laboratory. Selected properties of coated ferrate salts used as cathodes will be measured, and their electrochemical behavior versus zinc and lithium anodes will be evaluated. Researchers at both Argonne National Laboratory and Rayovac Corp. will assist with the required electrochemical characterization.Presently available batteries are limited in terms of both the energy that they can store, and the power that they can deliver to electronic devices. Highly oxidized iron materials, called ferrates, offer the possibility of improving battery design and performance. Studies to date, however, indicate that ferrates are not stable during long-term storage, and the amount of energy that they deliver in practice is significantly less than the theoretical limit. In this project we will attempt to improve the stability of ferrate materials by applying extremely thin coatings of nanoparticulate oxides to control the interaction with other battery materials that compromise ferrate integrity and performance. Successful completion of this project could lead to production of rechargeable batteries that deliver significantly more energy and power than present battery designs. The Approaches to Combat Terrorism Program in the Directorate for Mathematics and Physical Sciences supports new concepts in basic research and workforce development with the potential to contribute to national security.