Lithium Dentrite Growth Suppression and Ionic Conductivity of Li2S-P2S5-P2O5 Glass Solid Electrolytes Prepared by Mechanical Milling

Graduate Thesis Or Dissertation

Citations

Citeable URL: https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/m039k524q

Abstract

Conductivity of the 77.5Li₂S·22.5P₂S₅ (mol %) and 77.5Li₂S.(22.5 – x).P₂S₅.xP₂O₅ (mol %) glassy solid state electrolytes (SSEs) and possible correlation among the conductivity, density properties, varying P₂O₅ substitutions, and lithium deposition in symmetric lithium metal batteries were examined. The mechanical milling method was used to prepare the glassy SSEs. The conductivity and density of the 77.5Li₂S.22.5P₂S₅ (mol %) glassy electrolyte could be enhanced by adding a small amount of P₂O₅. The Li/77.5Li₂S.(22.5–x).P₂S₅.xP₂O₅ (mol %)/Li metal cells with P₂O₅ substitution of x<9 displayed longer cycling performance compared to Li/77.5Li₂S·22.5P₂S₅ (mol %)/Li metal cells. Hence, in the case of this study, the conductivity, density, and small P₂O₅ addition in the 77.5Li₂S·22.5P₂S₅ (mol %) glassy electrolyte would be the main factors of reduced dendrite growth.

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