Li-Ion Battery Ceramics: Structural and Microstructural Evolution Mechanisms of Processing under an Electric Field

锂离子电池陶瓷：电场加工的结构和微观结构演化机制

• 批准号: 1305694
• 负责人: Lia Stanciu
• 金额: $ 35万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1305694&HistoricalAwards=false
• 关键词: Li; Ion; Battery; Ceramics; Structural

NON-TECHNICAL DESCRIPTION: This project explores the fundamental hypothesis that applying an electric field during processing of ceramics, in particular lithium-ion battery relevant ceramics, has a significant effect on their porosity, densification, and ultimately on the reliability of the battery itself. The results will be used for the rational design of improved Li-ion battery relevant materials with targeted properties that overcome the current hurdles in their electrochemical and impedance performance. The fundamental knowledge acquired will impact the ceramics processing field by shedding light on a controversial topic (electric field effects on ceramics), and at the same time including fundamental advancements in the Li-ion battery field. The project also integrates education and training by incorporating both undergraduate research experiences, and a cyber-enabled experimental and computational materials science learning module. The learning module has a specific focus on integrated experimental and computational learning within the context of ceramic materials topics that are part of two courses offered at Purdue University.TECHNICAL DETAILS: The goal of this research is to reach an understanding, at a fundamental level, of the effect of the electric field application on the controlled processing of Li-ion battery relevant ceramic materials. The model materials of choice for this study are a sodium superionic conductor (Nasicon) ceramic, Li1.5Al0.5Ge1.5(PO4)3 (LAG) (an electrolyte material with high ionic conductivity), and lithium vanadium phosphate (Li3V2(PO4)3) (LVP) (a material that can serve both as a cathode and as an anode). Battery performance and reliability are closely related to the presence of inhomogeneities and microstructural defects in the component materials. This project first focuses on the development and application of an experimentally validated microstructural and porosity evolution spark plasma sintering (SPS) phase field sintering model. Next, the experimental design is using these modeling results to verify the influence of electric field in terms of sintering, vacancy migration, tortuosity, microstructural inhomogeneity and porosity evolution in the model systems (LVP, LAG, and LVP/LAG). The third step of the research uses advanced simulation models to include thermal and electric field contributions, as well as pressure and rapid heating regimes to the growth phenomena during SPS processing of the model materials. Finally, the previous results are used to set up an experimental model to include actual SPS sintering regimes that contain the integrated SPS sintering experimental parameters (electric field, temperature, heating rate, and pressure) towards processing of samples with controlled porosity and minimal tortuosity.

非技术描述：该项目探讨了以下基本假设：在陶瓷处理过程中应用电场，尤其是与锂离子电池相关的陶瓷，对它们的孔隙率，致密性以及最终对电池本身的可靠性产生了重大影响。结果将用于改进的锂离子电池相关材料的合理设计，其有针对性的特性可以克服当前的电化学和阻抗性能。获得的基本知识将通过阐明有争议的主题（对陶瓷的电场影响）来影响陶瓷处理领域，同时包括锂离子电池场的基本进步。该项目还通过纳入本科研究经验以及支持网络的实验和计算材料科学学习模块来整合教育和培训。该学习模块特别关注陶瓷材料主题的集成实验和计算学习，这些陶瓷材料主题是普渡大学提供的两个课程的一部分。技术详细信息：这项研究的目的是在基本层面上了解电场应用对李 - 离子电池相关的陶瓷材料的效果。本研究首选的模型材料是钠超级离子导体（Nasicon）陶瓷，Li1.5Al0.5Ge1.5（PO4）3（lag）（滞后）（具有高离子电导率）的电解质材料，磷酸盐（Li3v2（PO4）3）（LVP）（LVP）（材料）也可以作为Ane and Ane and Ane and and andose。 电池性能和可靠性与组件材料中不均匀性和微结构缺陷的存在密切相关。该项目首先着重于实验验证的微结构和孔隙率进化的开发和应用，火花等离子体烧结（SPS）相位场烧结模型。接下来，实验设计是使用这些建模结果来验证电场在模型系统中（LVP，LAG和LVP/LAG）中烧结，空缺迁移，曲折，微结构不均匀性和孔隙率演变的影响。研究的第三步使用先进的模拟模型，包括热场和电场贡献，以及在模型材料的SPS处理过程中对生长现象的压力和快速加热方案。 最后，先前的结果用于建立一个实验模型，以包括包含集成SPS烧结的实验参数（电场，温度，加热速率和压力）的实际SPS烧结方案，以处理具有控制孔隙度和最小曲折度的样品。