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

项目编号：1335850机构：印第安纳大学标题：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为开发先进的锂离子电池（LIB）技术进行了广泛的研究，以满足地面交通行业对更高能量和功率密度、更低成本和更安全操作的锂离子电池的需求。除了开发用于阳极、阴极和电解质的先进材料外，微观和纳米尺度上的电极结构也在决定LIB性能方面起着关键作用，因为电极？复合材料基体必须设计成同时提供电子和锂离子传输，这最终会影响锂离子电池。S电压、比容量和充放电速率。目前，对电极影响的基本理解是什么？由于电极的不均匀性、复杂性和三维（3D）性质，目前仍缺乏对锂离子电池性能的微结构影响。微观结构。在这项研究中，提出了一种新的方法来更好地了解电极的微观结构及其对锂离子电池的影响。使用液体电解质和固体电解质（全固态lib）时的物理和电化学性能。本研究中获得的知识有望帮助确定复合电极的最佳条件。这将产生具有高能量和功率密度的紧凑和安全的锂电池。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。这项工作有望为研制安全、高功率/能量密度的锂离子电池奠定工程和科学基础。为了实现这一目标，研究工作将首先集中在对复合电极的多孔微观结构及其对液体电解质LIBs电化学性能的影响的基本认识上，然后探索电极对液体电解质LIBs的影响。s微结构对全固态锂电池性能的影响。采用分辨率低于100 nm的x射线纳米计算机断层扫描（nano-CT）获得锂离子电池电极的三维微观结构。同步x射线纳米ct将首次尝试对复合电极进行微观结构表征，并识别全固体lib中的颗粒/颗粒界面。液体电解质和全固态锂电池都具有精细调整的微观结构，将在pi ？实验室。通过系统的实验，我们将获得丰富的知识，了解各种因素对锂离子电池电极的影响。建立基于有限体积法的综合数学模型和仿真框架，揭示电极内部的物理和电化学过程。实验和数值结果将用于建立LIB？S性能和电极微观结构。本研究的成功实施将直接促进当前使用液体电解质的锂离子电池的改进和下一代全固态锂离子电池的开发。从该项目中获得的科学和工程知识将提高电池的性能，从而广泛使用环境可持续的能源，特别是在地面运输中。研究生和本科生将通过这个项目获得重要的实践研究经验。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.