| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Process Metallurgy and Electrochemistry of Molten Salts, Liquid Metal Batteries, and Extra-terrestrial Materials Processing: An EPD Symposium in Honor of Don Sadoway
|
| Presentation Title |
Lithium Metal Battery for Future Energy Storage |
| Author(s) |
Y. Shirley Meng |
| On-Site Speaker (Planned) |
Y. Shirley Meng |
| Abstract Scope |
Inactive lithium (Li) formation is the immediate cause of capacity loss and catastrophic failure of Li metal batteries (LMBs). Using cryogenic electron microscopies to further reveal the micro- and nanostructure of inactive Li, we identified two ways for deposited metallic Li to lose electronic connections with the bulk electrode, thus becoming electrochemically inactive. By establishing a new analytical method, Titration Gas Chromatography (TGC), we accurately quantify the contribution from unreacted metallic Li to the total amount of inactive Li. We identify the unreacted metallic Li, rather than the (electro)chemically formed Li+ in SEI, as the dominating cause for the inactive Li and capacity loss in LMBs, clearing the long-term misconception in the field that the low CE is caused by the continuous repairing of SEI fracture which consumes both electrolyte and active Li. We ultimately propose strategies for highly efficient Li deposition and stripping to enable Li metal batteries. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |