Battery pole piece of all-solid-state battery as well as preparation method and application of battery pole piece

The invention provides a battery pole piece of an all-solid-state battery as well as a preparation method and application of the battery pole piece. The battery pole piece comprises a current collector and at least two electrode layers located on the surface of the current collector, and each electrode layer comprises an active substance, a solid electrolyte and a conductive agent; d50 of the solid electrolyte in the electrode layer is increased layer by layer in the direction from being close to the current collector to being far away from the current collector; in each of the electrode layers, the D50 of the active material is different from the D50 of the solid electrolyte. The electrode plate provided by the invention has the characteristics of high compaction, low porosity and compact particle accumulation, and the electrode plate of the all-solid-state battery provided by the invention has the characteristic of gradient ionic conductivity, that is, the ionic conductivity of the electrode material layer