Qiyue Luo, Siwu Li, Lin Li, Ziling Jiang, Ziyu Lu, Miao Deng, Jie Yang, Long Chen, Chen Liu, Chuang Yu
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引用次数: 0
Abstract
The argyrodite electrolyte Li6.6Si0.6Sb0.4S5I has garnered significant interest due to its high ionic conductivity of 9.0 mS cm-1. However, its integration into composite cathodes is hindered by poor chemical and electrochemical stability, limiting its practical application. This study investigates an O doping strategy to enhance the overall performance of Li6.6Si0.6Sb0.4S5I. In contrast to previous studies, a comparative analysis of two different oxygen sources Li2O and Sb2O5 is conducted. The results demonstrate that the electrochemical stability of the material obviously improves when Li2O is used as the O source, while its air stability significantly enhances when Sb2O5 is used. Furthermore, Li6.6Si0.6Sb0.4S5I (and Li6.6Si0.6Sb0.4S4.9IO0.1-Li2O) is combined with Li3InCl6 (and Li3.25InCl5.75O0.25) to fabricate different separator configurations. Through aging tests, the optimal separator configuration, Li3.25InCl5.75O0.25/Li6.6Si0.6Sb0.4S4.9IO0.1-Li2O, is found. Batteries assembled with this separator exhibit stable performance over 800 cycles at an upper cutoff voltage of 3.9 V (vs. Li-In), while maintaining an excellent capacity retention rate of 80.2%.
银柱石电解质Li6.6Si0.6Sb0.4S5I因其高达9.0 mS cm-1的高离子电导率而引起了人们的极大兴趣。然而，由于其化学和电化学稳定性差，阻碍了其集成到复合阴极中，限制了其实际应用。本研究研究了一种O掺杂策略来提高Li6.6Si0.6Sb0.4S5I的整体性能。与以往的研究相比，本文对两种不同氧源Li2O和Sb2O5进行了对比分析。结果表明：以Li2O为氧源时，材料的电化学稳定性明显提高；以Sb2O5为氧源时，材料的空气稳定性显著提高；然后，将li6.6 si0.6 sb0.4 s50（和Li6.6Si0.6Sb0.4S4.9IO0.1-Li2O）与Li3InCl6（和Li3.25InCl5.75O0.25）结合，制成不同的隔膜结构。通过老化试验，找到了最佳的隔膜配置：Li3.25InCl5.75O0.25/Li6.6Si0.6Sb0.4S4.9IO0.1-Li2O。使用该隔膜组装的电池在3.9 V （vs. Li-In）的最高截止电压下，在800次循环中表现出稳定的性能，同时保持80.2%的优异容量保持率。
期刊介绍：
ChemSusChem
Impact Factor (2016): 7.226
Scope:
Interdisciplinary journal
Focuses on research at the interface of chemistry and sustainability
Features the best research on sustainability and energy
Areas Covered:
Chemistry
Materials Science
Chemical Engineering
Biotechnology
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