Particle Packing in High-Nickel Content Cathodes

高镍含量阴极中的颗粒堆积

• 批准号: 2428653
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2428653
• 关键词: Particle; Packing; Nickel; Content; Cathodes

In addition to acquiring intimate knowledge of crystal structure and redox properties, the development of cathode materials requires in-depth analysis of particle properties, including particle shape, size, aggregate arrangement and packing information. This is a critical gap in our knowledge for high-nickel content cathodes.This project addresses the pressing need for insights into particle packing in high nickel-content NMC particles and how this affects cathode film preparation. This PhD student will work with PI Smith (expert in particle engineering) to fully characterise pristine and coated particles (supplied by co-I Corr) using SEM to identify primary particle size, aggregate size and shape effects and tomography (through microCT capabilities at Sheffield and via beamtime applications to Diamond Light Source) to evaluate 3D aggregate microstructure. We will study commercial samples of NMC-811 and nanostructured and coated NMC-811 particles available through Degradation project partners. Slurries of these various particle types will be analysed using dynamic light scattering and laser diffraction methods to arrive at a complete rheological picture of cathode slurries (e.g. shear profiles, viscosity effects, particle size effects). Slurries studied will follow the Degradation materials roadmap to ensure these results have greatest impact for other project partners, but findings here may also be of interest to other Faraday activities where particle processing is important.Resulting cathode films will be assessed using SEM, BET and tomography to investigate 3D structure and visualise particle packing. Finally, electrochemical analysis will provide a steer towards optimal particle packing arrangements. This information will enable researchers to (i) identify how rheological and thixotropic effects influence capacity stability with extended cycling and (ii) develop methodologies for consistent cathode film production for reliable cyclability. This project has clear synergy with several research strands of the Degradation project, including materials design and synthesis and materials degradation, as well as impacts for industry cathode film production.

除了获得晶体结构和氧化还原特性的深入知识外，阴极材料的开发还需要深入分析颗粒特性，包括颗粒形状，尺寸，聚集体排列和包装信息。这是我们在高镍含量阴极方面知识的一个关键空白。该项目解决了对高镍含量NMC颗粒中颗粒堆积以及这如何影响阴极薄膜制备的迫切需求。该博士生将与PI Smith（颗粒工程专家）一起工作，使用SEM完全识别原始和涂层颗粒（由co-I Corr提供），以确定初级颗粒尺寸，聚集体尺寸和形状效应，并进行断层扫描（通过谢菲尔德的microCT功能和通过钻石光源的束时应用程序）以评估3D聚集体微观结构。我们将研究通过降解项目合作伙伴获得的NMC-811和纳米结构和涂层NMC-811颗粒的商业样品。将使用动态光散射和激光衍射方法分析这些不同颗粒类型的浆料，以获得阴极浆料的完整流变图（例如剪切曲线、粘度效应、粒度效应）。研究的浆料将遵循降解材料路线图，以确保这些结果对其他项目合作伙伴产生最大的影响，但这里的发现也可能对其他法拉第活动感兴趣，其中颗粒处理是重要的。将使用SEM，BET和断层扫描来评估所得阴极薄膜，以研究3D结构并可视化颗粒堆积。最后，电化学分析将提供一个转向最佳的颗粒包装安排。这些信息将使研究人员能够（i）确定流变和触变效应如何影响延长循环的容量稳定性，以及（ii）开发一致的阴极薄膜生产方法，以实现可靠的循环能力。该项目与降解项目的几个研究方向具有明显的协同作用，包括材料设计和合成以及材料降解，以及对工业阴极薄膜生产的影响。