EAGER: The Development of Covalent Organic Frameworks as Anode Materials for Potassium-Ion Batteries

高性能电池的开发对于电动汽车、便携式电子产品和可再生能源电能存储等应用至关重要。虽然锂电池目前已被用于许多高性能应用，但基于钾和钠等地球上更丰富的材料的电池正在被研究为更可持续的替代品。在该项目中，研究人员正在寻求使用称为共价有机框架（COF）的高级结晶多孔聚合物制备下一代钾离子电池（KIB）的有机基电极材料。电极材料将有助于提高KIB的性能，并有助于减少化石燃料排放的有害温室气体的积累。主要研究者正在利用俄亥俄州的几个教育和推广计划，以帮助增加年轻的代表性不足的少数民族在STEM领域的参与。这些活动包括参加科学冠军早餐，这是一个OSU STEM计划，允许来自哥伦布市学校的代表性不足的中学生有机会参观并了解更多关于OSU各种尖端研究项目的信息。调查员还共同指导和指导学生在俄勒冈州立大学化学和生物化学后学士学位桥梁计划，俄勒冈州立大学干程序，提供援助后学士学位的少数民族学生，以帮助他们在博士学位的成功。程序.主要研究人员正在开发导电的二维（2D）基于COF的阳极材料，该材料含有用于KIB的三角形π电子共轭脱氢苯并轮烯（DBA）。COFs具有高的化学稳定性和开放的孔道，使它们可用于离子的运输;然而，钾在这些结构中的运输过程知之甚少，将在本探索性工作中进行研究。 虽然导电无机材料（例如，Sn、P、Sb和Bi），这些材料中的许多表现出体积膨胀，这可能损害系统的结构完整性和循环稳定性。烯烃键是有用的，这是由于它们增强的化学稳定性和沿着2D聚合物材料的x和y平面沿着延伸π-共轭的能力。DBA是中性大环，其具有氧化还原活性并且能够使用其外围芳环和软炔基配体与钾离子形成强的π-阳离子相互作用。这些特征将有助于制备具有上级电化学性能和良好循环性能的KIB用有机基电极。PI还将研究几种非水电解质，以最大限度地减少副反应和钾枝晶生长。 该探索性项目的结果可能会带来变革，从而设计出可用作高效KIBs组件的轻质烯烃连接COF基电极。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The development of high-performance batteries is vital for applications such as electric vehicles, portable electronics, and storage of electrical energy from renewable sources. Although lithium-based batteries are currently used in many high-performance applications, batteries based on more earth-abundant materials such as potassium and sodium are being investigated as more sustainable alternatives. In this project the investigators are seeking to prepare the next generation of organic-based electrode materials for potassium-ion batteries (KIBs) using an advanced class of crystalline porous polymers called covalent organic frameworks (COFs). The electrode materials will help improve the performance of KIBs and assist with reducing the accumulation of harmful greenhouse gases emitted from fossil fuels. The principal investigator is utilizing several education and outreach programs at Ohio State to help increase the participation of young underrepresented minorities in STEM fields. These activities include participation in the Breakfast of Science Champions, an OSU STEM program that allows underrepresented middle school students from Columbus City Schools the opportunity to visit and learn more about various cutting-edge research projects at OSU. The investigator is also co-directing and mentoring students in the OSU Chemistry and Biochemistry Post-Baccalaureate Bridge Program, an OSU STEM program that provides assistance to post-baccalaureate minority students to help enable their success in a Ph.D. program. The principal investigator is developing conductive two-dimensional (2D) COF-based anode materials that contain triangular-shaped pi-electron conjugated dehydrobenzoannulenes (DBAs) for KIBs. COFs possess high chemical stability and open pore channels, making them useful for the transport of ions; however, the transport processes of potassium within these structures are poorly understood and will be studied this exploratory work. Although conductive inorganic materials (e.g., Sn, P, Sb, and Bi) have been developed for KIBs, many of these materials exhibit volume expansion, which can compromise the structural integrity and cycling stability of the system. Olefin linkages are useful on account of their enhanced chemical stability and ability to extend pi-conjugation along the x and y planes of 2D polymeric materials. DBAs are neutral macrocycles that are redox-active and capable of using their peripheral aromatic rings and soft alkynyl ligands to form strong pi-cation interactions with potassium ions. These features will be useful for fabricating organic-based electrodes for KIBs with superior electrochemical properties and good cycling performance. The PI will also study several non-aqueous electrolytes that will minimize side reactions and potassium dendrite growth. Results from this exploratory project may be transformative in leading to the design of lightweight olefin-linked COF-based electrodes that can be used as components of highly efficient KIBs.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.