Journal
JOURNAL OF POWER SOURCES
Volume 501, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230031
Keywords
All-solid-state lithium battery; Solid electrolyte; Sulfide electrolyte; Li3SI; Li6PS5Cl
Funding
- Materials and Components Technology Development Program of MOTIE/KEIT, South Korea [20009957]
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In this study, solid electrolytes with improved performance were synthesized by mixing Li3SI with stable to lithium metal and high ionic conductivity Li6PS5Cl. The mixed electrolyte showed high ionic conductivity and excellent electrochemical performance, providing a promising solid electrolyte material for solid-state lithium batteries.
In this study, solid electrolytes with improved performance are synthesized by mixing Li3SI with an antiperovskite structure that is stable to lithium metal and Li6PS5Cl with high ionic conductivity. (100-x)Li(3)SIxLi(6)PS(5)Cl (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 80Li(3)SI-20Li(6)PS(5)Cl, which exhibits the best all-solid-state lithium battery performance, is 5.84 x 10(-4) S cm(-1). In addition, 80Li(3)SI-20Li(6)PS(5)Cl shows excellent stability against lithium metal. The 2032-type coin cell composed of fabricated Li-In/80Li(3)SI-20Li(6)PS(5)Cl/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.
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