GOALI - Collaborative Research: The Impact of Chemically Induced Stresses on Kinetic Processes and Degradation Mechanisms in Non-Stoichiometric Oxides

GOALI - 合作研究：化学诱导应力对非化学计量氧化物的动力学过程和降解机制的影响

• 批准号: 1410850
• 负责人: Yue Qi
• 金额: $ 27.5万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1410850&HistoricalAwards=false
• 关键词: GOALI; Collaborative; Research; Impact; Chemically

NON-TECHNICAL DESCRIPTION: This research project focuses on several oxide materials that are important in energy related applications. The central phenomena of interest are linked to internal stresses that are created by changes in composition (for example, adding and removing lithium in a battery material). The specific findings from this project are contributing directly to the development of improved electrodes for high energy density lithium ion batteries for hybrid and electric vehicles, and improved materials for applications in fuel cells and catalysis. Knowledge transfer is occurring through both public dissemination and direct interactions with researchers and General Motors. TECHNICAL DETAILS: In ionic materials there is a complex interplay between internal stresses, defects in the material, electrochemical phenomena and kinetic processes (e.g., diffusion and phase transformations). These stresses lead to degradation and performance limitations in new materials that are being explored for both solid oxide fuel cells and lithium ion batteries. Scientific understanding of these stress-related issues is currently very limited. In this project, research into these phenomena is based on systematic and strategically planned investigations that closely integrate theory and experiments. The efforts at Brown University employ precise in situ measurements of stresses along with other experimental methods to develop novel approaches for probing a variety of complex phenomena where stress interactions with fundamental mechanisms are poorly understood (e.g., defect association, grain boundary segregation, multicomponent diffusion, etc.). Interpretation of these data relies on atomic scale modeling at Michigan State University. Students and faculty from both Universities are working directly with Dr. Yan Wu and other researchers at General Motors, in ways that expand educational outcomes and enhance knowledge transfer to industry. The overall understanding of stress effects on kinetic processes and degradation mechanisms obtained from this project is also relevant to a broader range of ionic solids.

非技术描述：该研究项目侧重于几种在能源相关应用中很重要的氧化物材料。 感兴趣的中心现象与组成变化所产生的内部应力有关（例如，在电池材料中添加和去除锂）。 该项目的具体发现直接有助于开发用于混合动力和电动汽车的高能密度锂离子电池的改进电极，以及用于在燃料电池和催化中应用的材料。知识转移是通过公共传播和与研究人员和通用电机的直接互动发生的。 技术细节：在离子材料中，内部应力，材料缺陷，电化学现象和动力学过程（例如扩散和相变）之间存在复杂的相互作用。 这些应力会导致新材料的降解和性能限制，这些材料正在探索固体氧化物燃料电池和锂离子电池。目前，对这些与压力相关的问题的科学理解非常有限。 在该项目中，对这些现象的研究基于系统的和战略性计划的研究，这些研究紧密整合了理论和实验。 布朗大学的努力采用了应力的精确原位测量以及其他实验方法，以开发新的方法来探测各种复杂现象，其中应力与基本机制的应力相互作用鲜为人知（例如，缺陷关联，晶界分离，晶界分离，多组分扩散等）。 这些数据的解释依赖于密歇根州立大学的原子量表建模。 两所大学的学生和教职员工都直接与Yan Wu博士和其他一般电动机的其他研究人员合作，以扩大教育成果并增强知识转移到行业的方式。 从该项目获得的应力影响和降解机制的压力影响的总体理解也与更广泛的离子固体有关。