Tuning the Covalent Coupling Degree between the Cathode and Electrolyte for Optimized Interfacial Resistance in Solid-State Lithium Batteries

The development of promising solid-state lithium batterieshasbeen a challenging task mainly due to the poor interfacial contactand high interfacial resistance at the electrode/solid-state electrolyte(SSE) interface. Herein, we propose a strategy for introducing a classof covalent interactions with varying covalent coupling degrees atthe cathode/SSE interface. This method significantly reduces interfacialimpedances by strengthening the interactions between the cathode andSSE. By adjusting the covalent coupling degree from low to high, anoptimal interfacial impedance of 33 omega cm(-2) was achieved, which is even lower than the interfacial impedanceusing liquid electrolytes (39 omega cm(-2)). Thiswork offers a fresh perspective on solving the interfacial contactproblem in solid-state lithium batteries.

Automated summary

Researchers propose a strategy of introducing covalent interactions with varying degrees of coupling at the cathode/solid-state electrolyte interface, which significantly reduces interfacial impedance by strengthening the interactions between the cathode and SSE.