GOALI - Collaborative Research: Chemically induced stresses and degradation mechanisms in ceramic materials for Li ion batteries

GOALI - 合作研究：锂离子电池陶瓷材料的化学诱导应力和降解机制

• 批准号: 2054441
• 负责人: Yue Qi
• 金额: $ 27.42万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-02-01 至 2024-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2054441&HistoricalAwards=false
• 关键词: GOALI; Collaborative; Research; Chemically; induced; GOALI; Collaborative; Research; Chemically; induced

NON-TECHNICAL DESCRIPTION: This project focuses on surface damage layers that form on many of the oxide materials that are used in lithium-based batteries. Most of the research is designed to understand the formation of these layers, and to create strategies that can mitigate related degradation mechanisms in battery materials. The specific findings from this project will help to increase the lifetime of lithium-based batteries that are used in a variety of applications. Through the GOALI partner (General Motors), the work will contribute directly to industrial research on improved electrodes for high energy density lithium ion batteries for electric vehicles with zero emission. Knowledge transfer is occurring through both public dissemination and direct interactions with researchers at General Motors. TECHNICAL DETAILS: Many of the battery materials that can potentially improve the performance of lithium-based batteries are ceramics where surface damage layers (SDLs) cause serious limitations. For example, chemically and electrochemically induced structural changes that form surface films on layered cathode particles lead to substantial impedance rise and limited cycle life - to the extent that SDLs render these materials unusable after cycling. In all of these surface films, it is important to realize that a variety of factors lead to significant mechanical stresses, where the corresponding elastic energies interact with chemical and structural changes in ways that have not been addressed in most prior research. The need to develop fundamental knowledge about chemo-mechanical effects in SDLs and surface coatings is the primary motivation for the proposed research. Efforts at Brown University employ precise in situ measurements of stresses along with other experimental methods to develop novel approaches for probing a variety of complex phenomena where stress interactions with fundamental mechanisms are poorly understood (e.g., defect coupling, multicomponent diffusion, etc.). Interpretation of these data relies on building multiscale models informed by atomic scale simulations at Michigan State University. Students and faculty from both Universities are working directly with Dr. Yan Wu and other researchers at General Motors, in ways that expand educational outcomes and enhance knowledge transfer to industry. Via these direct interactions with industrial collaborators, the resulting new knowledge will be applied to commercially viable systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术描述：该项目着重于在基于锂的电池中使用的许多氧化物材料上形成的表面损伤层。大多数研究旨在了解这些层的形成，并创建可以减轻电池材料中相关降解机制的策略。该项目的具体发现将有助于增加在各种应用中使用的锂基电池的寿命。通过守门员合作伙伴（通用电动机），这项工作将直接促进对高能锂离子电池的改进电极的工业研究，用于零发射的电动汽车。知识转移是通过公共传播和与通用电机的研究人员进行直接互动发生的。技术细节：许多可以改善锂基电池性能的电池材料是陶瓷，使表面损伤层（SDL）造成严重限制。例如，化学和电化学诱导的结构变化，在分层阴极颗粒上形成表面膜会导致大量阻抗升高和循环寿命有限 - SDLS在循环后无法使用这些材料。在所有这些表面膜中，重要的是要认识到，多种因素会导致明显的机械应力，其中相应的弹性能与化学和结构变化在大多数先前研究中尚未解决的方式相互作用。在SDL和表面涂层中发展有关化学机械效应的基本知识的需求是拟议研究的主要动机。布朗大学的努力采用了应力的精确原位测量以及其他实验方法，以开发新的方法来探测各种复杂现象，其中应力与基本机制的相互作用鲜为人知（例如，缺陷耦合，多组分扩散等）。这些数据的解释依赖于密歇根州立大学原子量表模拟告知的构建多尺度模型。两所大学的学生和教职员工都直接与Yan Wu博士和其他一般电动机的其他研究人员合作，以扩大教育成果并增强知识转移到行业的方式。通过与工业合作者的这些直接互动，由此产生的新知识将应用于商业上可行的系统。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来获得支持。