Collaborative Research: Fracture Toughness of Lithium-Ion Battery Electrodes: An Integrative Experimental and Computational Study

合作研究：锂离子电池电极的断裂韧性：综合实验和计算研究

• 批准号: 1300805
• 负责人: Huck Beng Chew
• 金额: $ 18.13万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-03-01 至 2016-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1300805&HistoricalAwards=false
• 关键词: Collaborative; Research; Fracture; Toughness; Lithium

The research objective of this award is to use an integrative experimental and computational approach to investigate the fracture toughness and the underlying fracture mechanisms of electrode materials in lithium-ion batteries (LIBs). The proposed research will develop and implement an in-situ experimental setup to measure the constitutive behavior and extrinsic fracture properties of lithiated electrodes under well-controlled mechanical and electrochemical conditions. A numerical field-projection scheme will be used to extract the intrinsic cohesive properties at the crack-tip process zone from experimental far-field information. The coupled effects of mechanical and electrochemical processes on the electrode fracture characteristics will be elucidated by a micromechanics failure model, which incorporates the measured constitutive law and intrinsic cohesive parameters.If successful, the above studies will significantly advance the currently limited understanding of electrode material fracture in LIBs. Findings from this research will provide fundamental design criteria for microstructural optimization of ultra-high-capacity electrode materials with improved cycle life. The tightly integrated experimental and computational studies will expose participating students to a new field of fracture mechanics, which lies at the intersection of electrochemistry, physics, materials science and mechanics. Research results will be rapidly disseminated via open-access web-based resources, and will be integrated into undergraduate and graduate level courses. Through live demonstrations enhanced with multimedia tools, the PIs will actively educate elementary school students in the latest energy storage technologies to inspire them towards careers in science and engineering.

该奖项的研究目标是使用综合实验和计算方法来研究锂离子电池（LIB）中电极材料的断裂韧性和潜在的断裂机制。拟议的研究将开发和实施一个原位实验装置，以测量在良好控制的机械和电化学条件下锂化电极的本构行为和外在断裂特性。数值场投影方案将被用来从实验远场信息中提取裂纹尖端过程区的内在内聚性质。将阐明的耦合效应的电极断裂特性的机械和电化学过程中的微观力学失效模型，其中包括测量的本构关系和内在的cohesive parameters.如果成功，上述研究将显着推进目前有限的理解电极材料断裂LIBs。这项研究的结果将为提高循环寿命的超高容量电极材料的微观结构优化提供基本的设计标准。紧密结合的实验和计算研究将使参与学生接触到断裂力学的新领域，该领域位于电化学，物理学，材料科学和力学的交叉点。研究成果将通过开放式网络资源迅速传播，并将纳入本科和研究生课程。通过多媒体工具增强的现场演示，PI将积极教育小学生最新的储能技术，激励他们走向科学和工程职业。