Method for improving compactness of sulfide solid electrolyte and solid-state battery

The invention provides a method for improving compactness of sulfide electrolyte, which comprises the following steps: preparing filling slurry, preparing the filling slurry on the surface of the initial electrolyte, filling the filling slurry into the internal gap of the initial electrolyte through the flow characteristic of the slurry or by using external pressure, and finally processing to obtain the initial electrolyte. And repeating the filling step for multiple times to finally obtain the densified sulfide electrolyte. According to the method provided by the invention, internal pores of the electrolyte are filled, so that the porosity of the electrolyte is reduced, the inhibition on the growth of lithium dendrites is improved, and the overall safety of the battery is finally improved. 本发明提供了一种改善硫化物电解质致密性的方法，首先制备了填充浆料，再在所述初始电解质表面制备填充浆料，通过浆料自身的流动特性或者利用外部压力将填充浆料填充至初始电解质的内部空隙，再最终处理后，得到初始电解质；填充步骤重复多次，最终得到致密化的硫化物电解质。本申请提供的方法通过填充电解质内部孔隙，降低了电解质的孔隙率，提升了对锂枝晶生长的抑制，最终改善了电池的整体安全性。