Neutrons catch lithium in motion inside a solid-state battery
Institut Laue-LangevinBatteries are part of everyday life, powering everything from phones and laptops to electric cars. Most rechargeable batteries use a liquid to help lithium ions move during charging and discharging. But this liquid can create safety issues and limit how far battery performance can improve.
Solid-state batteries replace the liquid with a solid material. They could lead to safer, more compact and more powerful batteries. But making them work reliably remains a challenge. Unlike in a liquid, lithium ions must move through solid materials and if this movement is uneven, some parts of the battery may charge faster than others, reducing performance.
For the first time, a team at the Institut Laue-Langevin (ILL) and its partners have watched the lithium movement in real time using neutron diffraction, the only technique sensitive enough to track lithium deep inside a thick, working battery.
Their results revealed unexpected structural complexity in the electrode, showing that lithium movement inside the battery was not as uniform as expected. Understanding this hidden behaviour could point the way toward smarter battery designs.
- Journal
- Advanced Energy Materials
- Funder
- Institut Laue-Langevin, DESTINY Marie Sklodowska Curie, Région Nouvelle-Aquitaine, Agence Nationale de la Recherche