复合正极片及其制备方法、固态电池

本发明属于电池技术领域，尤其涉及一种复合正极片的制备方法，包括步骤：将聚合物和第一锂盐溶解于第一溶剂中，形成混合浆料；获取正极片，将所述混合浆料沉积于所述正极片远离集流体的一侧表面，干燥形成保护层，得到复合正极片。本发明提供的复合正极片的制备方法，工艺简单方便，适用于工业化大规模生产和应用，制备的复合正极片中保护层，不但能够有效隔离高能量插层类正极材料与固态电解质的直接接触，以避免界面不相容的问题；而且具有较好的锂离子传导性能，可降低固态电池正极与电解质接触的界面阻抗，减小固态电池的欧姆内阻，有利于提高电池的充放电性能。

The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a composite positive plate, which comprises the following steps: dissolving a polymer anda first lithium salt in a first solvent to form mixed slurry; and obtaining a positive plate, depositing the mixed slurry on the surface of one side, far away from the current collector, of the positive plate, and drying to form a protective layer, thereby obtaining the composite positive plate. The preparation method of the composite positive plate provided by the invention is simple and convenient in process and suitable for industrial large-scale production and application, and the prepared protective layer in the composite positive plate can effectively isolate direct contact between a high-energy intercalated positive electrode material and a solid electrolyte so as to avoid the problem of interface incompatibility; and the electrolyte has good lithium ion conduction performance, canreduce the interface impedance of the contact between the positive electrode of the solid-state battery and the electrolyte, reduces the ohmic internal resistance of the solid-state battery, and is beneficial to improving the charge-discharge performance of the battery.