Interfacial reactivity and interphase growth of argyrodite solid electrolytes at lithium metal electrodes
Interfacial reactivity and interphase growth of argyrodite solid electrolytes at lithium metal electrodes
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DOI：
10.1016/j.ssi.2017.07.005
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发表时间：
2018-05-01
影响因子：
3.2
通讯作者：
Janek, Juergen
中科院分区：
文献类型：
--
作者：
Wenzel, Sebastian;Sedlmaier, Stefan J.;Janek, Juergen
具有氧化银石结构的锂快离子导体Li_6PS_5X（X = Cl，Br，I）被认为是用于制造促进Li金属阳极的全固态电池（SSB）的合适候选者。需要使用金属阳极来实现具有高能量密度的SSB，然而，尚未系统地研究与Li金属接触的不同argyrodite的热力学稳定性。对锂金属的稳定性对于利用银矿的SSB的长期稳定性具有实际意义。在这里，Li6PS5X（X = Cl，Br，I）在与锂金属接触的稳定性的数据报告，获得从原位X射线光发射技术结合时间分辨阻抗谱。在与Li金属接触时，Li6PS5X分解成由Li3P、Li2S和LiX组成的界面相，其用作SEI并导致界面电阻增加。的SEI和由此产生的电阻演变的增长进一步分析其动力学方面，并与其他硫代磷酸盐超离子导体。发现Li6PS5I显示出特别强的SEI形成和严重的电阻增长。
Lithium superionic conductors with the argyrodite structure Li6PS5X (X = Cl, Br, I) are considered as suitable candidates for the fabrication of all-solid-state batteries (SSB) facilitating Li metal anodes. The use of metal anodes is required to achieve SSB with high energy densities, however, the thermodynamic stability of the different argyrodites in contact with Li metal has not been systematically investigated yet. The stability against lithium metal is of practical interest for long-term stability of SSB utilizing argyrodites. Here, data on the stability of Li6PS5X (X = Cl, Br, I) in contact with Li metal are reported, obtained from an in situ X-ray photo emission technique in combination with time-resolved impedance spectroscopy. In contact with Li metal, Li6PS5X decomposes into an interphase composed of Li3P, Li2S and LiX, which serves as an SEI and results in an increasing interfacial resistance. The growth of the SEI and the resulting resistance evolution is further analyzed in terms of its kinetics and is compared to other thiophosphate superionic conductors. Li6PS5I is found to show particularly strong SEI formation with severe resistance growth.