Negative-electrode-free sodium ion bipolar solid-state battery and preparation method thereof

The invention belongs to the technical field of solid-state batteries, and relates to a negative-electrode-free sodium-ion bipolar solid-state battery and a preparation method thereof.The negative-electrode-free sodium-ion bipolar solid-state battery comprises at least one bipolar battery unit, and each bipolar battery unit comprises at least one bipolar pole piece unit; wherein each bipolar pole piece unit comprises a current collector, a positive active material layer and a solid electrolyte layer which are stacked, the positive active material layer is positioned between the current collector and the solid electrolyte layer, and any two adjacent groups of bipolar battery units are arranged in parallel; any two adjacent groups of bipolar pole piece units are connected in series, and the solid electrolyte layer of one bipolar pole piece unit in any two adjacent groups of bipolar pole piece units abuts against the current collector of the other bipolar pole piece unit. According to the solid-state battery pro