Observation of Interfacial Degradation of Li6PS5Cl against Lithium Metal and LiCoO2 via In Situ Electrochemical Raman Microscopy,Batteries & Supercaps

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Observation of Interfacial Degradation of Li6PS5Cl against Lithium Metal and LiCoO2 via In Situ Electrochemical Raman Microscopy
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-28 , DOI: 10.1002/batt.201900218
Yundong Zhou _{1,

2,

3} , Christopher Doerrer _{3,

4} , Jitti Kasemchainan _{3,

4} , Peter G. Bruce _{3,

4} , Mauro Pasta _{3,

4} , Laurence J. Hardwick _{1,

2,

3}

Affiliation

Sulfide‐based Li⁺ conducting solid electrolytes, such as argyrodite, Li₆PS₅Cl, for all‐solid‐state batteries can have comparable ionic conductivities with liquid electrolytes. However, the interface between sulfide containing solid electrolytes and Li metal and Li‐ion positive electrodes has been found to be unstable, leading to poor cell performance and cycling. Understanding the in situ evolution of interfacial layers between the electrolyte and both electrodes is of paramount importance for designing stable and long‐life solid‐state batteries. Here, in situ Raman microscopy was used to study the interface between Li₆PS₅Cl electrolyte and metallic Li and LiCoO₂. Under potential control, Raman microscopy identified the appearance of degradation products (Li₂S, P₂S_x and polysulfides) at the electrode/solid electrolyte interface.

中文翻译：

通过原位电化学拉曼显微镜观察Li6PS5Cl对锂金属和LiCoO2的界面降解

用于全固态电池的基于硫化物的Li ⁺导电固体电解质，例如，亚硫酸氢锂，Li ₆ PS ₅ Cl，可以具有与液体电解质相当的离子电导率。但是，已发现含硫化物的固体电解质与锂金属和锂离子正极之间的界面不稳定，从而导致电池性能和循环性能变差。了解电解质和两个电极之间的界面层的原位演化对于设计稳定且长寿命的固态电池至关重要。在这里，使用原位拉曼显微镜研究Li ₆ PS ₅之间的界面Cl电解质和金属Li和LiCoO ₂。在电势控制下，拉曼显微镜确定了电极/固体电解质界面处降解产物（Li ₂ S，P ₂ S _x和多硫化物）的出现。

更新日期：2020-02-28

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