High Ionic-Conducting Li-ion Argyrodites Synthesized Using a Simple and Economic Liquid-Phase Approach and Their Application in All Solid-State-Lithium Batteries

We develop a new solution synthesis strategy for producing high ionic-conducting sulfide solid electrolyte using ethylenediamine (EDA) solvent. Here, we follow three simple steps: dissolve the precursor in ethylenediamine solvent to form the clear solution, then removing a solvent at 180 °C followed by heat treatment. The prepared Li5.5MPS4.5Cl1.5 electrolyte demonstrated the high ionic conductivity of 2.87 mS cm-1 at 25 °C. Further, fabricated solid battery using optimized electrolyte exhibited a high initial discharge capacity of 175.7 mAh g-1 at 0.1 C rate. Moreover, the synthesis technique is a convenient and quick process, thus facilitating mass production of solid electrolytes.