Positive pole piece of secondary battery, preparation method of positive pole piece and secondary battery

The invention provides a positive pole piece of a secondary battery, a preparation method of the positive pole piece and the secondary battery, and aims to solve the problem that the capacity of the secondary battery is difficult to improve due to high water content of the positive pole piece. The positive pole piece of the secondary battery comprises a current collector and a material body attached to the surface of one side of the current collector, the water content of the material body is less than or equal to 700ppm; wherein the material body comprises a binder and a positive electrode material, and the mass percent of the binder in the material body is 1.5%-7%; and the binder is a high-temperature-resistant material which is not molten at the temperature of greater than or equal to 180 DEG C. 本申请提供了一种二次电池的正极极片及其制备方法、二次电池，用于降低二次电池由于正极极片含水量高而容量难以提升的问题。该二次电池的正极极片，包括集流体和附于所述集流体一侧表面的料体；所述料体含水量小于或等于700ppm；其中，所述料体包括粘结剂和正极材料，所述料体中所述粘结剂的质量百分比为1.5％-7％；所述粘结剂为，在大于或等于180℃的温度条件下不熔融的耐高温材料。