时间：2022年12月9日（周五） 上午8:30-10:00

Time: 8:30 am-10:00 am, Friday, December 9, 2022

线上：ZOOM ID 885 4154 5728

Online: ZOOM ID 885 4154 5728

主持人: 西湖大学工学院 朱一舟 博士

Host: Dr. Yizhou Zhou, PI, Westlake University

语言：英文

Language: English

主讲嘉宾/Speaker：

Prof. Yue Qi 齐月

Joan Wernig Sorensen Professor

Brown University

主讲人简介/Biography:

Dr. Yue Qi is the Joan Wernig Sorensen Professor of Engineering at Brown University. She received her Ph.D. degree in Materials Science from Caltech and spent the next 12 years working at the General Motors R&D Center. In 2013, she joined Michigan State University (MSU) as a faculty in the Chemical Engineering and Materials Science Department till 2020. Professor Qi and her lab develop multi-scale simulation methods to design materials that are critically important for an energy-efficient and sustainable future.  She has received several research awards, including the co-recipient of the 1999 Feynman Prize in Nanotechnology for Theoretical Work; three GM Campbell awards; and the 2017 Minerals, Metals & Materials Society (TMS) Brimacombe Medalist Award.

讲座摘要/Abstract:

High interfacial resistance and Li dendrite growth are two major bottlenecks for all-solid-state Li-ion batteries. At interfaces, charge transfer reactions occur, and electrochemistry, physics, and solid mechanics are coupled. This talk will focus on the new mechanistic understanding obtained by the recently developed multi-scale modeling approaches.

The high interfacial resistance originates from physical contact and chemical effect. The chemical effect was captured by a density functional theory (DFT)-informed theoretical model, which predicts the potential map inside a solid-state battery. This new physics insight unified the previous observations and led to new device design rules to promote interfacial ion transport. The physical contact was described by combining mechanical and electrochemical models, suggesting how much pressure can recover the capacity drop due to contact area loss. Another challenge for high energy density solid-state barriers using Li-metal electrodes is the soft Li dendrite growth inside the hard solid electrolytes. A DFT-informed phase-field method was developed and successfully explained the experimentally observed dendrite intergranular growth and revealed that the trapped electrons at grain boundaries and surfaces may be the main reason to reduce Li-ion and nucleate metallic Li. A new dendrite-resistant criterion is therefore proposed. These modeling advancements will help to guide the development of all-solid-state Li-ion batteries.

讲座联系人/Contact:

工学院石怀玮

shihuaiwei@westlake.edu.cn