Lithium-Argyrodite Based Solid-State Battery Design and Fabrication

Lithium-metal based solid-state batteries (SSB) are considered to the <i>holy-grail</i> of the next generation battery technology for their promise of higher energy density (500 Wh/Kg), safety and providing a flexible platform for integrating a number of solid-electrolytes (SE) and high capacity cathodes to achieve the end goal for users. The talk will highlight on various <i>state-of-the art</i> solid-electrolytes and their key physical and electrochemical attributes for enabling stable electrode-electrolyte interfaces and integration with high capacity cathodes The design rule for achieving high energy and fast charge SSB will be discussed with specific focus on sulfide based solid-electrolytes. Most of the sulfide-based SE compositions such as Li₃PS₄ and Argyrodite (LiPS₅X; X= Cl, Br) are thermodynamically unstable against high voltage cathodes such as NMC. Multiple approaches to limit the undesired decomposition of SE at the cathode-SE interfaces and improve capacity retention using interfacial coating and optimizing the cathode composition and architecture. Finally, issue related to anode free configuration using argyrodite based SE will be discussed.<br/>Acknowledgement<br/>This research was conducted at Oak Ridge National Laboratory, managed by UT Battelle, LLC, for the U.S. Department of Energy (DOE) and is supported by Asst. Secretary, Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (VTO) through the Advanced Battery Materials Research (BMR) Program.