Electrical and electrochemical properties of glass–ceramic electrolytes in the systems Li2S–P2S5–P2S3 and Li2S–P2S5–P2O5

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Abstract Electrical and electrochemical properties of the 70Li 2 S·(30 − x)P 2 S 5 ·xP 2 S 3 and the 70Li 2 S·(30 − x)P 2 S 5 ·xP 2 O 5 (mol%) glass–ceramics prepared by the mechanical milling technique were investigated. Glass–ceramics with 1 mol% P 2 S 3 and 3 mol% P 2 O 5 showed the highest conductivity of 5.4 × 10 − 3  S cm − 1 and 4.6 × 10 − 3  S cm − 1 , respectively. Moreover, these glass–ceramics showed higher electrochemical stability than the 70Li 2 S·30P 2 S 5 (mol%) glass–ceramic. From the XRD patterns of the obtained glass–ceramics, trivalent phosphorus and oxygen were incorporated into the Li 7 P 3 S 11 crystal. We therefore presume that the Li 7 P 3 S 11 analogous crystals, which were formed by incorporating trivalent phosphorus and oxygen into the Li 7 P 3 S 11 crystal, improve the electrical and electrochemical properties of the glass–ceramics. An all-solid-state cell using the 70Li 2 S·29P 2 S 5 ·1P 2 S 3 (mol%) glass–ceramic as solid electrolyte operated under the high current density of 12.7 mA cm − 2 at the high temperature of 100 °C. The cell showed an excellent cyclability of over 700 cycles without capacity loss.

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