Abstract

Battery safety remains the first and ?foremost concern for electric vehicles. It has been taken for granted ?that all solid state batteries (ASSBs) have superior safety and high ?energy density. But ASSBs of high energy density mean the use of ?lithium metal anode, which is a thermodynamically more energetic and ?kinetically more flammable fuel than liquid carbonate electrolytes in ?conventional Li-ion batteries. In this talk we present a novel method ?to measure the shorting current, intracell temperature rise, and ?ensuing fires in lithium batteries. We reveal for the first time that ?ASSB fires occur over an ultrashort time scale of 1-5 seconds upon ?internal shorting, making pack-level safety measures virtually in vain.

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 230+ journal publications and an ?H-index of 115. 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 10 ?biggest science stories in 2022 by the Guardian. He is an academician ?of U.S. National Academy of Inventors (NAI), a fellow of American ?Society of Mechanical Engineers (ASME) and a speaker of many public ?forums such as 2021 Tencent WE Summit alongside two Nobel Laureates, ?2022 Distinguished Transport Lecture at Hong Kong University, 2023 ?Hawkins Lecture at Purdue University, and 2024 PAIR Distinguished ?Lecture at Hong Kong Polytechnic University.