Li₄SnS₄ Sulfide Composite Electrolyte for Improved Solid-State Lithium Batteries

In all-solid lithium metal batteries, sulfide electrolytes offer superior ion conductivity. Nevertheless, they also confront significant challenges, such as the formation of internal dendrites and instability in lithium and humid air. In order to overcome these issues, a sulfide composite electrolyte has been prepared by mixing polyethylene oxide polymers with air-stable inorganic sulfide, Li₄SnS₄, which can achieve good chemical and electrochemical stability. Meanwhile, the introduced Li₄SnS₄ can facilitate the movement of Li⁺ ions in the composite electrolyte, which exhibits an elevated ion conductivity up to 2.55 × 10⁻⁵ S cm⁻¹.