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Preparation of sulfide solid electrolytes in the Li2S–P2S5 system by a liquid phase process

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Abstract

Sulfide solid electrolytes in the Li2S–P2S5 system were synthesized by a liquid phase process under ultrasonic irradiation, and heat treatments at low temperatures. Crystal phase, structure, morphology and ionic conductivity of the sulfide electrolytes were examined after solvent removal at 180 °C and two different heat treatment temperatures, 220 °C and 250 °C. The study revealed that the ionic conductivities of the xLi2S·(100 − x)P2S5 sulfide electrolytes, in compositions with 70 ≤ x ≤ 75 mol%, are largely influenced by the local structure. The heat treatment at 220 °C was found to be an adequate temperature to promote crystallization of the high ionic conductive Li7P3S11 phase. Higher temperatures for heat treatment such as 250 °C lead to the formation of P2S64− (hypo-thiodiphosphate) units in the local structure of the sulfide electrolytes leading to a reduction of ionic conductivity. The formation and distribution of PS43− (ortho-thiophosphate), P2S74− (pyro-thiophosphate) and P2S64− units in the local structure were found to be key factors in achieving higher ionic conductivity (up to 10−3–10−4 S cm−1 at room temperature).

Graphical abstract: Preparation of sulfide solid electrolytes in the Li2S–P2S5 system by a liquid phase process

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Publication details

The article was received on 22 Nov 2017, accepted on 22 Dec 2017 and first published on 25 Dec 2017


Article type: Research Article
DOI: 10.1039/C7QI00737J
Citation: Inorg. Chem. Front., 2018, Advance Article
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    Preparation of sulfide solid electrolytes in the Li2S–P2S5 system by a liquid phase process

    M. Calpa, N. C. Rosero-Navarro, A. Miura and K. Tadanaga, Inorg. Chem. Front., 2018, Advance Article , DOI: 10.1039/C7QI00737J

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