CAREER: Identifying and Controlling Interfacial and Structural Instabilities in Transition Metal Oxide Cathodes for Na-ion Batteries

职业：识别和控制钠离子电池过渡金属氧化物阴极的界面和结构不稳定性

• 批准号: 2142726
• 负责人: Omer Capraz
• 金额: $ 50万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2023-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2142726&HistoricalAwards=false
• 关键词: CAREER; Identifying; Controlling; Interfacial; Structural

This project is jointly funded by the CBET Electrochemical Systems program and the Established Program to Stimulate Competitive Research (EPSCoR) Program. Increasing energy demand associated with the growing population, environmental concerns, and technological advancements imposes pressure on modern society to utilize renewable energy sources. Sodium (Na)-ion batteries are promising candidates for large-scale/grid-scale energy storage in terms of availability of raw sources, cost reduction and its environmentally benign nature. However, the electrochemical performance of Na-ion batteries suffers from short cycle life and rapid capacity fade due to severe instabilities in the cathode materials. Lack of understanding of instability mechanisms limits the design of novel cathode materials for Na-ion batteries. The research program will generate fundamental knowledge of the underlying governing forces behind the instabilities and deformations in Na-ion cathodes. This knowledge is a potentially transformative concept for other “beyond Li-ion battery” technologies such as K-ion, Mg-ion, and Ca-ion batteries. The overarching educational objective in this CAREER proposal is to facilitate learning the fundamentals of batteries at K-12, undergraduate and graduate student levels as well as increase public knowledge of the fundamentals of battery operations. The educational and outreach activities include developing graphic novels about battery operation mechanisms for K-12 students, providing an educational platform for future K-12 teachers in STEM fields, preparing battery exhibits at a Science Museum, and integrating research outputs into college education. This CAREER proposal addresses the scientific problem related to poor interfacial and structural stabilities of transition metal oxide cathodes in Na-ion batteries. The proposal will focus on transition metal oxides made of earth abundant minerals such as manganese and iron. The goal of the research activities is to identify the impact of transition metals, operation voltage and electrolyte chemistry on chemo-mechanical instabilities in transition metal oxides cathodes. The guiding hypothesis is that intercalation of Na+ ions in transition metal oxide structure inevitably alters the coupled transport-reaction processes, leading to chemo-mechanical instabilities in the surface and structure of the electrode, resulting in rapid capacity fade. The project will examine the coupling between reaction-transport behavior and mechanical deformations in single and binary transition metal oxide cathodes cycled in organic liquid electrolytes. In operando stress / strain measurements will be coupled with chemical and structural characterization techniques to identify the governing force on interfacial and structural deformations.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.

该项目由CBET电化学系统联合资助，增加了与不断增长的人口，环境问题和技术进步相关的能源需求，这对现代社会施加了可再生能源（NA）的能源。规模/网格尺度的储能在其环境良性的性质方面的可用性对于Na-ion阴极中的稳定性和变形，这是其他“超越锂离子电池”技术的变革概念促进在K-12上学习电池的基础知识，地下研究生级别，并增加了电池操作的S。 STEM田地，在科学博物馆介绍了Theon的一项科学博物馆。电解质化学机械性不稳定性的金属ES阴极的指导假设是NA+ INS内部结构的插入不可避免的，不可避免地改变了传输反应的ROCESSES，导致了电势的化学机械性反应传输D电源之间的耦合。