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Effects of Br substitution to improve the ionic conductivity of chloride electrolytes without changing crystal structure

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Abstract

Chloride solid-state electrolytes (SSEs) are of great interest because of their wide electrochemical window. However, most chloride SSEs have lower ionic conductivity, which makes it difficult to apply chloride SSEs in high-rate all-solid-state lithium-ion batteries (ASSLIBs). Therefore, in this study, Li3HoCl6 was synthesized by a wet chemical method, followed by Br substitution (Li3HoCl6-xBrx) to improve the ionic conductivity. We found that the crystal structure of the Br substituted product did not change with increasing x to 1 and 2, but its ionic conductivity improved significantly, reaching 1.24 mS cm-1 at 298 K for the Li3HoCl4Br2, which is about ten times higher than that of the unsubstituted product. However, when the amount of substitution is further increased (x = 3), the crystal structure is changed. The present work illustrates that Br substituted Li3HoCl6 is a promising SSE and lays the foundation for subsequent works.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 52261040, 51971104).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Jun Peng, Lei Xian & Ling-Bin Kong

  2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Lei Xian & Ling-Bin Kong

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  1. Jun Peng
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  2. Lei Xian
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Jun Peng: Investigation, Data Curation, Writing - Original Draft; Lei Xian: Data Curation, Supervision; Ling-Bin Kong: Conceptualization, Supervision, Project administration, Funding acquisition.

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Correspondence to Ling-Bin Kong.

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Peng, J., Xian, L. & Kong, LB. Effects of Br substitution to improve the ionic conductivity of chloride electrolytes without changing crystal structure. Ionics 29, 2657–2664 (2023). https://doi.org/10.1007/s11581-023-05028-5

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