Bio: Dr. Chao-Yang Wang is William E. Diefenderfer Chair Professor of Mechanical Engineering and Professor of Chemical and Materials Science & Engineering at the Pennsylvania State University. He has 220+ journal publications and an H-index of 113. He holds over 140 patents and has published two books, “Battery Systems Engineering” by Wiley and “Modeling and Diagnostics of Polymer Electrolyte Fuel Cells” by Springer. Dr. Wang is known for his innovative research on batteries and fuel cells; particularly for pioneering a new battery paradigm with modulatory states and interfaces. The all-climate battery (ACB) he invented was adopted by 2022 Winter Olympics as well as commercialized by several carmakers. His latest invention on fast charging batteries was named as one of the 10 biggest science stories in 2022 by the Guardian. He is a Fellow of U.S. National Academy of Inventors (NAI) and American Society of Mechanical Engineers (ASME) and a speaker of many public forums such as 2021 Tencent WE Summit alongside two Nobel Laureates, 2022 Stanford StorageX Symposium, and 2022 Distinguished Transport Lecture at Hong Kong University. Dr. Wang’s expertise covers the transport, materials, manufacturing and modeling of batteries and fuel cells.

Abstract: Smaller, faster-charging batteries are the answer for affordable and sustainable electric vehicles for everyone, everywhere. The ability to quickly refill energy is profoundly important in the era of critical materials and battery shortages. In this talk I will present asymmetric temperature modulation (ATM) approach to enabling 10-minute fast charging of energy-dense Li-ion batteries in any temperatures (even at -50°C) while still delivering remarkable cycle life. A novel cell structure capable of thermal stimulation is introduced. We will also discuss a new figure of merit for fast charging batteries, composed of three metrics simultaneously: charge time (<10 min), specific energy acquired by fast charge (>200 Wh/kg), and cycle number (>1000) under the fast charge condition. Finally, battery fast charging must work in tandem with high-temperature stability of cycling and storage in order to provide high safety and low degradation and survive in hot summers. Thus there is a simultaneous need for greater than 4C charging and stable cycling and storage at greater than 75oC. Novel thermal management concepts for extreme fast charging will be presented. Overall, our development points to a new paradigm of battery design and thermal management without having to trade-off among fast charge, safety, lifetime, and cost.