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Lithium-ion highly conducting Li6PS5Cl argyrodite-type solid electrolyte was prepared by a facile solution process using pyridine solvent as the reaction medium. During the synthesis process, an excess amount of P2S5 was added to suppress impurity peaks and enhance the ionic conductivity. Powder X-ray diffraction analyses were carried out to analyze the crystalline phase and purity of the prepared Li6PS5Cl solid electrolyte. In addition, laser Raman spectroscopy and XPS were employed to confirm the formation of Li6PS5Cl solid electrolyte. Highly conductive Li6PS5Cl solid electrolyte was obtained following a series of optimization processes, and it was found that the Li6PS5Cl-15 P2S5 solid electrolyte shows a high ionic conductivity value (4.3 mS cm–1) at room temperature. We have used cyclic voltammetry (CV), DC polarization, and galvanostatic charge–discharge techniques to study the electrochemical performance of the selected Li6PS5Cl-15 P2S5 solid electrolyte.

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