Structure, ionic conductivity and electrochemical stability of Li2S–P2S5–LiI glass and glass–ceramic electrolytes

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Abstract The structures, ionic conductivities and electrochemical stabilities of the (100 − x)(0.7Li 2 S·0.3P 2 S 5 )·xLiI glass and glass–ceramic electrolytes were investigated. The (100 − x)(0.7Li 2 S·0.3P 2 S 5 )·xLiI glasses and glass–ceramics were prepared by mechanical milling in the composition range 0 ≤ x (mol%) ≤ 20. All the glasses and glass–ceramics had P 2 S 7 4 − and PS 4 3 − ions. The Li 7 P 3 S 11 crystals were observed in all the glass–ceramics. On the other hand, crystals containing PS 4 3 − ions were mainly precipitated in the glass–ceramics with increasing the LiI content. The conductivities of glasses increased with increasing the LiI content, and the glass at x = 20 showed the highest conductivity of 5.6 × 10 − 4  S cm − 1 . While the conductivity of glass–ceramics at x = 0 was 4.2 × 10 − 3  S cm − 1 , it decreased sharply with increasing the LiI content. Cyclic voltammetry indicated that the 80(0.7Li 2 S·0.3P 2 S 5 )·20LiI glasses exhibited a wide electrochemical stability up to 10 V vs. Li + /Li.

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