Pole piece and preparation method thereof, secondary battery and electric equipment

The invention provides a pole piece and a preparation method thereof, a secondary battery and electric equipment. The pole piece comprises a current collector and a safety coating arranged on the surface of at least one side of the current collector, wherein an electrode active material layer is further arranged on the surface of one side, deviating from the current collector, of the safety coating; wherein the safety coating comprises a binder, a conductive agent, an active material and a halloysite nanotube, and a lithium-containing material is loaded in a tube cavity of the halloysite nanotube. According to the pole piece, the safety performance of the battery can be improved, and irreversible lithium ion loss can be made up for the battery, so that the energy density of the battery is improved. 本申请提供了极片及其制备方法、二次电池及用电设备。该极片包括集流体和设置在所述集流体至少一侧表面的安全涂层，所述安全涂层背离所述集流体的一侧表面还设有电极活性材料层；其中，所述安全涂层包括粘结剂、导电剂、活性材料以及埃洛石纳米管，所述埃洛石纳米管的管腔中负载有含锂材料。上述极片不仅可以提升电池的安全性能，还能够为电池弥补不可逆的锂离子损失，以提升电池的能量密度。