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Bulk and interface-strengthened Li7P2.9Sb0.1S10.65O0.15I0.2 electrolyte via dual-source doping for all-solid-state lithium-sulfur batteries

通过双掺杂增强Li7P2.9Sb0.1S10.65O0.15I0.2电解质用于高 性能全固态锂硫电池

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Abstract

Sulfide solid electrolyte is a promising candidate for the development of high-energy lithium-sulfur (Li-S) batteries. However, the concurrent improvement of ionic conductivity, bulk air stability, and compatibility of the electrolyte/electrode interface of sulfide solid electrolyte remains a huge challenge. Herein, we propose a dual-source doping (Sb2O3 and LiI) strategy to prepare a multifunctional sulfide solid electrolyte. Sb2O3 can broaden the transmission path of lithium ions and improve the bulk stability, and LiI can inhibit the generation of lithium dendrites and reduce the electrolyte/electrode resistance. Therefore, the sulfide solid electrolyte can be strengthened in terms of its bulk and interface, thus exhibiting a high ionic conductivity of 1.69 × 10−3 S cm−1 at 30°C, high air stability, and high electrochemical stability with lithium metal. On this basis, the as-prepared all-solid-state Li-S batteries (ASSLSBs) can exhibit a high specific discharge capacity after being cycled at 0.05 C for 100 cycles at room temperature (833 mA h g−1) or 60°C (949 mA h g−1). This work provides a rational scheme for the preparation of practical sulfide solid electrolytes and high-performance ASSLSBs.

摘要

硫化物固体电解质是发展高容量锂硫电池的理想候选者. 然而, 同时提高硫化物固体电解质的离子导电性、空气稳定性和电解质/电 极界面的相容性仍然是一个巨大的挑战. 因此, 我们提出了一种双掺杂 (Sb2O3和LiI)策略来制备多功能硫化物固体电解质. Sb2O3可以拓宽锂离 子的传输路径和提高空气稳定性, 而LiI可以抑制锂枝晶的生成和降低 电解质/电极之间的电阻. 因此, 硫化物固体电解质在空气中和界面上 的性能得到了增强, 在30°C下的离子电导率为1.69 × 10−3 S cm−1, 且具 有很好的空气稳定性, 对金属锂也很稳定. 在此基础上, 组装的全固态 锂硫电池以0.05 C循环100圈后, 表现出较高的放电比容量(室温, 833 mA h g−1; 60°C: 949 mA h g−1). 本文为制备实用的硫化物固体电解 质和高性能全固态锂硫电池提供了合理的方案.

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Acknowledgements

This work was supported by the Science and Technology Support Plan of Tianjin (19YFZCGX00220), the National Natural Science Foundation of China (21935006), and the Fundamental Research Funds for the Central Universities, Nankai University (63211043).

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Authors and Affiliations

  1. Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China

    Bo-Sheng Zhao  (赵博生), Peng Chen  (陈鹏) & Xue-Ping Gao  (高学平)

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  1. Bo-Sheng Zhao  (赵博生)
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  2. Peng Chen  (陈鹏)
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  3. Xue-Ping Gao  (高学平)
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Contributions

Zhao BS, Chen P, and Gao XP conceived the idea. Zhao BS carried out the preparation and electrochemical tests of the devices. Zhao BS, Chen P, and Gao XP co-wrote the paper. All the authors contributed to the general discussion.

Corresponding authors

Correspondence to Peng Chen  (陈鹏) or Xue-Ping Gao  (高学平).

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The authors declare that they have no conflict of interest.

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Supporting data are available in the online version of the paper.

Bo-Sheng Zhao is currently a PhD candidate at the School of Materials Science and Engineering, Nankai University. His general research interests are in the areas of modifying sulfide solid electrolytes and preparing high-performance all-solid-state lithium-sulfur batteries.

Peng Chen is a lecturer at the School of Materials Science and Engineering, Nankai University. He received his BS degree in 2015 from the College of Chemistry and PhD degree in 2020 from the School of Materials Science and Engineering, Nankai University. His general research interests are in the area of novel energy conversion and storage systems, including solar rechargeable batteries, new types of solar cells, and all-solid-state batteries.

Xue-Ping Gao is a professor at the Institute of New Energy Material Chemistry, Nankai University. He received his doctorate degree from the Department of Chemistry at Nankai University in 1995. He worked as a visiting research fellow at Kogakuin University in Japan from 1997 to 1999. Currently, his main research focuses on energy storage materials for power sources, including lithium-ion, lithium-sulfur, and solar rechargeable batteries.

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Bulk and interface-strengthened Li7P2.9Sb0.1S10.65O0.15I0.2 electrolyte via dual-source doping for all-solid-state lithium-sulfur batteries

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Zhao, BS., Chen, P. & Gao, XP. Bulk and interface-strengthened Li7P2.9Sb0.1S10.65O0.15I0.2 electrolyte via dual-source doping for all-solid-state lithium-sulfur batteries. Sci. China Mater. 66, 513–521 (2023). https://doi.org/10.1007/s40843-022-2182-0

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