Computed tomography image-based study for understanding the impact of electrode microstructure on lithium ion battery performance

主要研究者：Zhu，Likun提案编号：1335850机构：印第安纳州大学标题：基于计算机断层扫描图像的研究，以了解电极微观结构对锂离子电池性能的影响已经进行了广泛的研究，以开发先进的锂离子电池（LIB）技术，以满足地面交通行业对LIB的需求，具有更高的能量和功率密度，更低的成本，更安全的操作。除了开发用于阳极、阴极和电解质的先进材料外，电极在微米和纳米尺度上的结构在决定锂离子电池的性能方面也起着关键作用，因为电极？的复合基质必须设计为提供电子和锂离子运输，最终影响锂离子电池？s电压、比容量和放电/充电速率。目前，对电极的影响有一个基本的了解？的微观结构对锂离子电池的性能仍然缺乏由于不均匀性，复杂性，和三维（3D）的性质的电极？的微观结构。在这项研究中，提出了一种新的方法，以获得更好的了解电极的微观结构及其对锂离子电池的影响？当使用液体电解质以及固体电解质（全固体LIB）时，其物理和电化学性能。在这项研究中获得的知识，预计将有助于确定复合电极的最佳条件？该研究项目采用独特的跨学科方法，使用电化学，纳米技术，透射X射线显微镜，材料科学和数值模拟等领域的实验和理论分析工具。这项工作有望为安全和高功率/能量密度LIB奠定工程和科学基础。为了实现这样一个目标，研究工作将首先集中在复合电极的多孔微观结构及其对液体电解质LIBs的电化学性能的影响的基本认识，其次是探索到电极的影响？的微观结构对全固态锂离子电池性能的影响。将采用分辨率低于100 nm的X射线纳米计算机断层扫描（nano-CT）来获得LIB电极的3D微结构。首次，同步辐射X射线纳米CT将试图执行复合电极的微观结构表征，并确定在全固体LIB的颗粒/颗粒界面。无论是液体电解质和全固体锂离子电池与微调微结构将设计，制造，并在PI？labs.通过系统的实验，将获得丰富的知识阵列的各种因素在LIB电极的影响。基于有限体积法建立了一个全面的数学模型和模拟框架，以揭示电极中的物理和电化学过程。实验和数值计算结果将被用来建立LIB？本研究的成功实施将直接促进目前使用液体电解质的LIB的改进和下一代全固体LIB的开发。从该项目中获得的科学和工程知识将提高电池的能力，从而使环境可持续能源得到广泛使用，特别是在地面交通中。研究生和本科生将通过这个项目获得关键的实践研究经验。夏令营将为当地高中生和K-12教师提供一个独特的机会，探索先进电池技术和可再生能源的跨学科领域。

PI: Zhu, LikunProposal Number: 1335850Institution: Indiana UniversityTitle: Computed tomography image-based study for understanding the impact of electrode microstructure on lithium ion battery performanceExtensive research has been conducted to develop advanced lithium ion battery (LIB) technologies to meet the demands of the ground transportation industry for LIBs with higher energy and power densities, lower cost, and safer operation. In addition to the development of advanced materials for the anode, cathode, and electrolyte, the structure of the electrodes at the micro- and nano-scales also plays a critical role in determining the performance of a LIB because the electrode?s composite matrix must be designed to provide both electron and lithium ion transportation, which eventually affects the LIB?s voltage, specific capacity, and discharge/charge rate. Currently, a fundamental understanding of the impact of an electrode?s microstructure on LIB performance is still lacking due to the inhomogeneity, complexity, and three-dimensional (3D) nature of the electrode?s microstructure. In this study, a novel approach is proposed to gain greater understanding of the microstructure of the electrode and its impact on the LIB?s physical and electrochemical performances when using liquid electrolytes as well as solid electrolytes (all-solid LIBs). The knowledge gained in this study is expected to help identify the optimal conditions of the composite electrode?s components and microstructure that will yield compact and safe LIBs with high energy and power densities.This research project takes a unique, interdisciplinary approach using experimental and theoretical analysis tools from the areas of electrochemistry, nanotechnology, transmission x-ray microscopy, material science, and numerical modeling. This work is expected to establish the engineering and scientific foundation for safe and high power/energy density LIBs. To achieve such an objective, the research efforts will first focus on the fundamental understanding of the porous microstructure of the composite electrode and its impact on the electrochemical performance of liquid electrolyte LIBs, followed by exploration into the impact of the electrode?s microstructure on all-solid LIB performances. X-ray nano-computed tomography (nano-CT) with sub-100 nm resolution will be employed to obtain the 3D microstructure of the LIB electrodes. For the first time, synchrotron x-ray nano-CT will be attempted to perform microstructural characterization of the composite electrode and to identify the particle/particle interface in all-solid LIBs. Both liquid electrolyte and all-solid LIB cells with finely tuned microstructure will be designed, fabricated, and characterized in the PIs? labs. A rich array of knowledge will be obtained through systematic experiments regarding the effects of various factors in the LIB electrodes. A comprehensive mathematical model and simulation framework based on the finite volume method will be established to reveal the physical and electrochemical processes in the electrode. The experimental and numerical results will be used to establish the correlations between the LIB?s performance and the electrode microstructure.The successful implementation of this research would directly facilitate the improvement of current LIBs that use liquid electrolytes and the development of next generation all-solid LIBs. The scientific and engineering knowledge gained from this project will improve battery capability allowing for the widespread use of environmentally sustainable energy sources, especially in ground transportation. Graduate and undergraduate students will gain critical hands-on research experience through this project. Summer camps will provide local high school students and K-12 teachers a unique opportunity to explore the interdisciplinary fields of advanced battery technologies and renewable energy.