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Interplay between Li3YX6 (X = Cl or Br) solid electrolytes and the Li metal anode

Li3YX6(X = Cl或Br)固态电解质和锂金属负极之间的相互作用

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Abstract

The interplay between solid electrolytes and electrodes is of vital importance to the performance of all-solid-state Li batteries. Recently, halide superionic conductors have emerged as a new family of high-performance solid electrolytes, but their compatibility with Li metal, i.e., the anode with the highest theoretical capacity, has not been systematically studied. Here, we investigate the interaction between Li metal and two representative halide solid electrolytes: Li3YCl6 and Li3YBr6. Both materials are found to form interphases with Li, similar to most solid electrolytes. However, the interphases observed here contain electronic conducting components, which are detrimental to their compatibility with Li. By elucidating this phenomenon, the present study provides guiding principles for improving the Li compatibility of halide solid electrolytes.

摘要

固态电解质与电极之间的相互作用对全固态锂电池的性能至关重要. 最近, 研究者发现了一类新的高性能固态电解质: 卤化物超离子导体. 但是, 它们与锂金属这一理论比容量最高的负极的相容性尚未被系统研究. 本文中, 我们研究了锂金属和两种代表性卤化物固态电解质—Li3YCl6和Li3YBr6—之间的相互作用. 这两种材料和其他很多固态电解质类似, 与锂发生反应形成中间相. 然而, 此处观察到的中间相包含电子导电成分, 会损害固态电解质对金属锂的相容性. 通过解析这一现象, 本工作为改善金属锂和卤化物固态电解质的相容性提供了指导法则.

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Acknowledgements

This research was supported by the National Key R&D Program of China (2018YFA0209600 and 2017YFA0208300), the National Natural Science Foundation of China (51802302), and the Fundamental Research Funds for the Central Universities (WK3430000006)

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Authors and Affiliations

  1. Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China

    Yuanyuan Fu  (符媛媛) & Cheng Ma  (马骋)

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  1. Yuanyuan Fu  (符媛媛)
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  2. Cheng Ma  (马骋)
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Contributions

Fu Y conducted the experiments and wrote the manuscript. Ma C provided the overall concept and supervised the research.

Corresponding author

Correspondence to Cheng Ma  (马骋).

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Conflict of interest

The authors declare that they have no conflicts of interest.

Yuanyuan Fu received her Bachelor’s degree from Nanjing University of Science and Technology in 2018 and is currently studying for her Master’s degree at the University of Science and Technology of China (USTC). Her main research interests focus on all-solid-state batteries and halide solid state electrolytes.

Cheng Ma received his BS degree of materials science and engineering in 2006 from Tsinghua University (Beijing, China) and PhD degree of materials science and engineering in 2012 from Iowa State University. After completing his work as a postdoctoral researcher at the Oak Ridge National Laboratory in 2016, he joined USTC as a professor. His research interest lies in the critical materials and interfaces in all-solid-state Li batteries.

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Fu, Y., Ma, C. Interplay between Li3YX6 (X = Cl or Br) solid electrolytes and the Li metal anode. Sci. China Mater. 64, 1378–1385 (2021). https://doi.org/10.1007/s40843-020-1580-3

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  • DOI: https://doi.org/10.1007/s40843-020-1580-3

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