Sulfide Electrolyte Suppressing Side Reactions in Composite Positive Electrodes for All-Solid-State Lithium Batteries.,ACS Applied Materials & Interfaces

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Sulfide Electrolyte Suppressing Side Reactions in Composite Positive Electrodes for All-Solid-State Lithium Batteries.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-06-08 , DOI: 10.1021/acsami.0c05050
Misae Otoyama ₁ , Atsushi Sakuda ₁ , Masahiro Tatsumisago ₁ , Akitoshi Hayashi ₁

Affiliation

Long-lasting all-solid-state batteries can be achieved by preventing side reactions in the composite electrodes comprising electrode active materials and solid electrolytes. Typically, the battery performance can be enhanced through the use of robust solid electrolytes that are resistant to oxidation and decomposition. In this study, the thermal stability of sulfide solid electrolytes Li₃PS₄ and Li₄SnS₄ toward oxide positive electrode active materials was estimated by investigating the occurrence of side reactions at the electrolyte–electrode interfaces when the composite electrodes are heated in an accelerated aging test: Li₄SnS₄ showed higher thermal stability because of the suppression of the substitution reaction between S and O. Moreover, thermally stable sulfide solid electrolytes are amenable to an improved cell construction process. The sintering (pelletizing and subsequent heating) of the composite electrodes with Li₄SnS₄ as the solid electrolyte allowed the manufacture of dense electrodes that exhibited increased ionic conductivity, thereby enhancing the battery performance.

中文翻译：

全固态锂电池复合正极中的硫化物电解质抑制了副反应。

通过防止在包括电极活性材料和固体电解质的复合电极中的副反应，可以实现持久的全固态电池。通常，可以通过使用耐氧化和分解的坚固的固体电解质来增强电池性能。在这项研究中，通过研究复合电极在加速状态下加热时在电解质-电极界面处发生的副反应，估算了硫化物固体电解质Li ₃ PS ₄和Li ₄ SnS ₄对氧化物正极活性材料的热稳定性。老化测试：Li ₄ SnS ₄由于抑制了S和O之间的取代反应，因此显示出更高的热稳定性。此外，热稳定的硫化物固体电解质适合于改进的电池构造过程。以Li ₄ SnS ₄作为固体电解质的复合电极的烧结（造粒和随后的加热）使得能够制造出具有高离子传导性的致密电极，从而提高了电池性能。

更新日期：2020-07-01

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