Assembling all-solid-state batteries presents a unique challenge due to chemical and electrochemical complexities of interfaces between a solid electrolyte and electrodes. While the interface stability is dictated by thermodynamics, making use of passivation materials often delays interfacial degradation and extends the cycle life of all-solid cells. In this work, we investigated antiperovskite lithium oxychloride, Li₃OCl, as a promising passivation material that can engineer the properties of solid electrolyte-Li metal interfaces. Our experiment to obtain stoichiometric Li₃OCl focuses on how the starting ratios of lithium and chlorine and mechanochemical activation affect the phase stability. For substantial LiCl excess conditions, the antiperovskite phase was found to form by simple melt-quenching and subsequent high-energy ball-milling. Li₃OCl prepared with 100% excess LiCl exhibits ionic conductivity of 3.2 × 10⁻⁵ S cm⁻¹ at room temperature, as well as cathodic stability against Li metal upon the extended number of cycling. With a conductivity comparable to other passivation layers, and stable interface properties, our Li₃OCl/LiCl composite has the potential to stably passivate the solid-solid interfaces in all-solid-state batteries.

由于固态电解质和电极之间界面的化学和电化学复杂性，组装全固态电池提出了独特的挑战。尽管界面稳定性是由热力学决定的，但使用钝化材料通常会延迟界面降解并延长全固态电池的循环寿命。在这项工作中，我们研究了抗钙钛矿型三氯氧化锂Li ₃ OCl，它是一种有前途的钝化材料，可以设计固体电解质与Li金属界面的性能。我们获得化学计量Li _3的实验OCl专注于锂和氯的起始比例以及机械化学活化如何影响相稳定性。对于大量的LiCl过量条件，发现通过简单的熔融淬火和随后的高能球磨形成抗钙钛矿相。用100％过量的LiCl制备的Li ₃ OCl在室温下的离子电导率为3.2×10 ^-5 S cm ^-1，并且随着循环次数的增加，对Li金属的阴极稳定性也提高。我们的Li ₃ OCl / LiCl复合材料具有可与其他钝化层媲美的电导率和稳定的界面性能，具有稳定钝化全固态电池中固态界面的潜力。