A Method for All Solid State Electrode with Superior Energy Density for Lithium Ion Batteries

Solid state batteries are highly sought after in the battery field. Solid state electrolytes (SSE), a central component of these batteries, offer improved safety as they replace the highly flammable organic solvents typical of conventional liquid electrolytes. Additionally, SSEs are compatible with a wider range of energy-dense electrode materials and exhibit better temperature stability than their liquid counterparts. Solid state batteries are therefore decidedly advantageous in the rapidly developing fields of mobile devices and electric vehicles. However, ceramic-sulfide SSEs, which are currently the most promising class of materials, have narrow electrochemical stability, limiting the voltages at which they can operate.

The present invention describes rechargeable alkali metal sulfide SSEs with superior voltage stability and battery cycle performance. Volumetric constriction design principles are utilized in the electrolyte, electrode, and battery design, including core-shell morphology control, interface control, and battery production control, to limit electrolyte expansion and thus decay. The method improves the electrochemical stability of the all solid state battery, making it compatible with high voltage cathodes near 5V and low voltage anodes as low as 0V for high energy density and cycling performance. These advances in SSE design were achieved by applying rigorous theoretical framework and simulations developed in the Li Laboratory.

Part of this work was published in Small and Advanced Energy Materials.

Intellectual Property Status: Patent(s) Pending