Conductive agent and preparation method thereof, positive pole piece, negative pole piece and solid-state battery

The invention discloses a conductive agent and a preparation method thereof, a positive pole piece, a negative pole piece and a solid-state battery, the conductive agent comprises: an inner core, the inner core comprising a conductive carbon material; the shell layer coats at least part of the surface of the inner core, and the shell layer comprises a fast ion conductor. The conductive agent can improve the interface stability of the solid-state battery, provides abundant transmission channels for ions and electrons, improves the transmission efficiency of the ions and the electrons, improves the electrochemical performance of the solid-state battery, and prolongs the service life of the solid-state battery. 本申请公开了导电剂及其制备方法、正极极片、负极极片和固态电池，所述导电剂包括：内核，所述内核包括导电碳材料；壳层，所述壳层包覆所述内核的至少部分表面，所述壳层包括快离子导体。本申请的导电剂可以提高固态电池的界面稳定性，同时为离子和电子提供丰富的传输通道，以提高两者的传输效率，整体提升固态电池的电化学性能和使用寿命。