TITLE: 电池退化分析与电池优化
SPEAKER: 吕炜教授   密西根大学机械工程系
TIME:July 27 (Monday)AM10:30
LOCATION: 410Meeting Room, Chemistry Building B (化学B楼410会议室)
INVITER: Prof. Jun Yang (杨军教授)
 

Degradation analysis and optimization of batteries

Wei Lu

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA

Abstract

The electrification of the drivetrain is crucial to solve our energy problems and fill the gap to sustainable and zero emission mobility. Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV) face significant battery-related challenges, including limited driving range and high battery cost resulting from the capacity fade of batteries during usage. The analysis of capacity fade is important for cell design, determination of the optimal operation condition and control, and cell maintenance, and eventually the successful implementation of HEVs and EVs. Various mechanisms contribute to capacity fade. An integrated approach considering different aspects of the fading mechanisms is necessary. In this talk I will present some of our works on modeling the fading mechanisms in Li-ion batteries together with experimental investigations. Specifically, I will focus on those mechanisms that are not well understood before, such as side-reaction coupled behaviors, stress evolution in active material particles due to coupled phase transition and intercalation, facture of active material particles, ion diffusion and percolation, dissolution of active materials, heat generation under various operational and environmental conditions, and effects of face pressure on cell performance. We have developed a life prediction framework that integrates multiple physics across different scales — including electrochemical, transport, thermal, mechanical and thermodynamic processes.

Bio

Dr. Wei Lu is Professor of the Mechanical Engineering Department at the University of Michigan (UM) and Director of the research center: GM/UM Advanced Battery Coalition for Drivetrains. He earned his Ph.D. from Princeton University in 2001 and joined the faculty of UM in the same year.

Prof. Lu uses multi-scale and multi-physics modeling and experimental approaches to address emerging challenges in energy and nanomechanics across multiple scales. In the energy area, Prof. Lu’s research has led to an integrated analysis of the complex Li-ion battery fading process. His studies have revealed the collective actions of multiple fading mechanisms and generated a realistic 3-D mechanical, thermal and electrochemical framework for predicting and optimizing battery performance, which is critical to electrical vehicles. He has made seminal contributions to the scientific understanding and engineering application of mechanics and materials systems involving interface motion, structure evolution and deformation. His work has revealed self-assembly mechanisms and ways to guide their behaviors in various systems involving multiple energetic forces and kinetic processes, particularly systems where elasticity plays an important role. This work enables the systematic application of self-assembly for nanofabrication. Prof. Lu published over 100 peer-reviewed journal papers; and he has many publications in conference proceedings, encyclopedias and book chapters. He has given more than 100 presentations and invited talks at international conferences; universities and national labs including Harvard, MIT and Stanford; and at other prestigious institutions worldwide.

Prof. Lu is a Fellow of the American Society of Mechanical Engineers. Among his honors include the Distinguished Professor Award by Novelis and the University of Michigan; Gustus L Larson Memorial Award by the American Society of Mechanical Engineers; the Faculty Recognition Award by the University of Michigan; Department’s Achievement Award; Robert M. Caddell Memorial Research Achievement Award; the National Science Foundation’s CAREER Award; the Robert J. McGrattan Award by the American Society of Mechanical Engineers; the U.S. Air Force Summer Faculty Fellow. He was also invited to the National Academies’ Keck Futures Initiative Conference multiple times.