About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Chemo-Mechanics of Solid State Batteries |
| Author(s) |
Wendy Gu, William Chueh, Teng Cui, Xin Xu, Samuel Lee |
| On-Site Speaker (Planned) |
Wendy Gu |
| Abstract Scope |
Lithium metal solid-state batteries have high potential for safety, energy density, and charging rate beyond that of Li-ion batteries. A major challenge for lithium metal solid-state batteries is the formation of lithium dendrites across the solid electrolyte during cycling, which leads to short-circuiting and mechanical failure of the cell. The reason that dendrites form is not fully understood, but evidence shows that dendrites could initiate either at the surface or within the interior of the solid electrolyte. Here, I present our use of in-situ mechanical and electrochemical testing to investigate dendrite initiation and propagation in polycrystalline and single crystalline garnet-type oxide solid electrolytes (LLZO) and glassy sulfide electrolytes. Then, I will show the effect of biaxial compressive stress on dendrite initiation and propagation in LLZO. This allows lithium symmetric cells to be cycled at current densities up to 100 mA/cm2, for >10,000 cycles. |