Differentiating grain and grain boundary ionic conductivities of Li-ion antiperovskite electrolytes

Jingfeng Zheng; Jocelyn Elgin; Jieren Shao; Yiying Wu

doi:10.1016/j.esci.2022.10.002

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Jingfeng Zheng, Jocelyn Elgin, Jieren Shao, Yiying Wu. Differentiating grain and grain boundary ionic conductivities of Li-ion antiperovskite electrolytes[J]. eScience. doi: 10.1016/j.esci.2022.10.002

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Jingfeng Zheng, Jocelyn Elgin, Jieren Shao, Yiying Wu. Differentiating grain and grain boundary ionic conductivities of Li-ion antiperovskite electrolytes[J]. eScience. doi: 10.1016/j.esci.2022.10.002

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Differentiating grain and grain boundary ionic conductivities of Li-ion antiperovskite electrolytes

doi: 10.1016/j.esci.2022.10.002

Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Ohio 43210, United States

Received Date: 2022-03-01
Revised Date: 2022-08-30
Accepted Date: 2022-10-12

Available Online: 2022-10-18

Abstract

Abstract

Recently, antiperovskites such as Li₂OHX (X = Cl, Br) have gained attention as possible solidstate electrolytes for use in all-solid-state batteries. Their low melting point allows for scalable manufacturing, making them more attractive than other inorganic solid-state electrolytes, and their high ion selectivity and good mechanical rigidity are superior to those of polymer electrolytes. However, there is significant variation of up to three orders of magnitude between reported ionic conductivities in different studies. One of the likely reasons is that studies have not separated Liion conduction contributions from the grain and the grain boundaries. Therefore, in this study, we present an electrochemical impedance analysis of Li-ion antiperovskites (Li₂OHBr and Li₂OHCl) prepared by different methods: cold press, hot press, and melt casting. We thereby separate the contributions from grain ionic conduction and grain boundary ionic conduction. While each method gives the same grain conductivity, the grain boundary conductivity depends on the preparation method. The largest improvement in grain boundary conductivity was found using the melt-casting method. These results provide an explanation for the reported variations in ionic conductivity.
- Solid-state electrolyte,
- Antiperovskites,
- Grain and grain boundary,
- Ionic conductivity,
- Li₂OHBr,
- Li₂OHCl

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