In Situ Characterization of Interface Evolution in All Solid-State Li Batteries
In Situ Characterization of Interface Evolution in All Solid-State Li Batteries
Abstract
Interfacial stability is one of the critical challenges in all solid-state Li metal batteries. Multiple processes such as solid electrolyte decomposition and lithium dendrite growth take place at the solid interfaces during cycling, leading to the overall cell failure. To deconvolute these complex processes, we have developed an in situ characterization set up that allows the visualization of highly localized Li plating/stripping processes and reliable post mortem chemical and morphological analysis of the intact solid electrolyte/Li interface. Based on these findings, we propose the mechanisms regarding the localized Li nucleation and growth, side reactions, and dead Li formation, as well as the strategy to build the stable interface in argyrodite based all solid-state cells.
Speaker
Wei TongWei Tong is a Scientist in the Advanced Energy Materials Group within the Energy Storage and Distributed Resources Division at Lawrence Berkeley National Laboratory. She earned B.S. and M.S. degrees in Materials Science from Wuhan University of Technology, China, and Ph.D. degree from Rutgers University in 2010. Following her doctoral studies, she worked at Wildcat Discovery Technologies and developed various battery cathode materials using a high throughput platform. In 2014, she joined the Berkeley Lab and her research has been focused on a range of electrode materials, including layered, Li-rich metal oxide/oxyfluoride cathodes, silicon and graphite anodes for Li-ion batteries, solid electrolytes for all-solid-state Li metal batteries, and electrocatalysts for water treatment. Her work has resulted in 15 inventions and 3 U.S. Drive Highlights of Technical Accomplishments (2017, 2019, 2021). She also led projects that received 2 R&D 100 awards (2021, 2024).