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Abstract |
In this study, solid electrolytes with improved performance are synthesized by mixing Li3SI with an anti-perovskite structure that is stable to lithium metal and Li6PS5Cl with high ionic conductivity. (100-x)Li3SI-xLi6PS5Cl (x = 0, 10, 20, 30), which is a mixture of two sulfide-based solid electrolytes, is prepared by ball milling. The structural characteristics, surface morphology, and particle size of the electrolyte material are analyzed using physico-chemical characterization technologies, such as high-power X-ray diffraction and field emission scanning electron microscopy. Electrochemical impedance spectroscopy is used to calculate the ionic conductivity of the mixed solid electrolyte. The ionic conductivity of 80Li3SI-20Li6PS5Cl, which exhibits the best all-solid-state lithium battery performance, is 5.84 ㅠ 10-4 S cm-1. In addition, 80Li3SI-20Li6PS5Cl shows excellent stability against lithium metal. The 2032-type coin cell composed of fabricated Li-In/80Li3SI-20Li6PS5Cl/NCM811 composites shows a superior capacity of 165 mAh g-1 in the initial cycle. This study provides high ionic conductivity and excellent electrochemical performance through the mixing of two kinds of solid electrolyte materials to obtain a promising solid electrolyte. |
