Visualizing the Chemical Incompatibility of Halide and Sulfide‐Based Electrolytes in Solid‐State Batteries
Visualizing the Chemical Incompatibility of Halide and Sulfide‐Based Electrolytes in Solid‐State Batteries
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可视化固态电池中卤化物和硫化物基电解质的化学不相容性
DOI：
10.1002/aenm.202203673
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发表时间：
2022-12
影响因子：
27.8
通讯作者：
Carolin Rosenbach;F. Walther;Justine Ruhl;Matthias Hartmann;T. Hendriks;Saneyuki Ohno;J. Janek
中科院分区：
文献类型：
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作者：
Carolin Rosenbach;F. Walther;Justine Ruhl;Matthias Hartmann;T. Hendriks;Saneyuki Ohno;J. Janek
与硫化物电解质相比，卤化物基固体电解质具有较高的电化学稳定性窗口，因此目前人们对固态电池的兴趣越来越大。然而，通常使用硫化物和卤化物的双层分离器，除了卤化物对锂金属的不稳定性外，还不清楚为什么需要这样的设置。结果表明，电解质双分子层抑制了界面电阻的增长，从而提高了容量保持。通过飞行时间二次离子质谱分析和聚焦离子束扫描电镜分析对埋藏界面进行深入分析表征，在卤化物和硫化物接触区域检测到富含硫化铟的区域，可见这两种电解质的化学不相相容性。结果强调需要考虑的不仅仅是电解质材料的电化学稳定性，表明当在固态电池中使用卤化物基固体电解质时，所有成分的化学相容性可能是最重要的。
Halide‐based solid electrolytes are currently growing in interest in solid‐state batteries due to their high electrochemical stability window compared to sulfide electrolytes. However, often a bilayer separator of a sulfide and a halide is used and it is unclear why such setup is necessary, besides the instability of the halides against lithium metal. It is shown that an electrolyte bilayer improves the capacity retention as it suppresses interfacial resistance growth monitored by impedance spectroscopy. By using in‐depth analytical characterization of buried interphases by time‐of‐flight secondary ion mass spectrometry and focused ion beam scanning electron microscopy analyses, an indium‐sulfide rich region is detected at the halide and sulfide contact area, visualizing the chemical incompatibility of these two electrolytes. The results highlight the need to consider more than just the electrochemical stability of electrolyte materials, showing that chemical compatibility of all components may be paramount when using halide‐based solid electrolytes in solid‐state batteries.