POS6-0727
Tunable Electrochemical Prelithiation of Li–In Alloy Anodes for stable Sulfide-Based All-Solid-State Batteries
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Yiwen Lu (Sungkyunkwan University)
Co-Author(s)
Abstract
Sulfide-based all-solid-state batteries promise high energy density and intrinsic safety, yet their practical implementation is constrained by unstable Li-metal/sulfide interfaces, uncontrolled Li deposition, and rapid interfacial resistance growth. Alloy anodes offer a viable route to regulate Li activity, but conventional alloying methods often suffer from poor controllability, inhomogeneous phase distribution, and limited interfacial adaptability. Here, we report an electrochemical prelithiation strategy to construct a Li–In alloy anode with a tunable alloying degree and stabilized interface toward Li₆PS₅Cl solid electrolytes. The optimized Li–In alloy anode exhibits a uniform interfacial morphology, favorable phase formation, and intimate contact with the sulfide electrolyte, enabling suppressed polarization and retarded impedance growth during Li stripping/plating. When coupled with an NMC811 composite cathode, the optimized Li–In alloy enables stable full-cell cycling with nearly 100% Coulombic efficiency and 82% capacity retention after 150 cycles at 0.5C. This work establishes electrochemical prelithiation as a simple and controllable interfacial engineering strategy for stable sulfide-based all-solid-state batteries.
