Solid-state batteries (SSBs) exhibit a promising prospect due to their potential in terms of safety and energy densities. As an oxide electrolyte, cubic garnet solid electrolyte (cubic-Li₇La₃Zr₂O₁₂) attracts wide attention due to the high ionic conductivity. However, the problem of poor contact between garnet solid electrolyte and lithium impairs the development of solid electrolytes. Herein, we demonstrate an effective modification method to cope with the interface issue between electrolyte and Li metal by introducing an Ag@WSe₂ composite layer. By applying this method, the interfacial resistance between the garnet electrolyte and Li metal is reduced to ~12.5 Ω cm², which is nearly 150 times lower than the value of 1900 Ω cm² before modification. The WSe₂ acts as a framework to immobilize Ag, while Ag forms an Ag–Li alloy with lithium for lithium ions transportation. And other Ag@TMDs (transition metal dichalcogenides) composites have also been proven to have similar effects. In addition, the Li | Ag@WSe₂-LLZO | LFP full cell demonstrates a satisfactory capacity and excellent cycle stability (500 cycles with 90% capacity retention rate) at room temperature.

固态电池（SSB）由于其在安全性和能量密度方面的潜力而具有广阔的前景。作为氧化物电解质，立方石榴石固体电解质（cubic-Li ₇ La ₃ Zr ₂ O ₁₂）由于具有高离子电导率而引起了广泛关注。但是，石榴石固体电解质与锂之间的接触不良的问题损害了固体电解质的发展。在这里，我们演示了一种有效的改性方法，通过引入Ag @ WSe ₂复合层来解决电解质与锂金属之间的界面问题。通过应用此方法，石榴石电解液和锂金属之间的界面电阻降低到〜12.5Ωcm ²，比修改前的1900Ωcm ²值低将近150倍。WSe ₂作为固定Ag的框架，而Ag与锂形成用于锂离子运输的Ag-Li合金。其他Ag @ TMDs（过渡金属二卤化钨）复合材料也被证明具有类似的作用。另外，李| Ag @ WSe ₂ -LLZO | LFP全电池在室温下显示出令人满意的容量和出色的循环稳定性（500个循环，容量保持率达90％）。