Preparation method of lithium ion battery positive pole piece with long service life and multi-layer coated thick electrode

The invention discloses a preparation method of a lithium ion battery positive pole piece with a long service life and a multi-layer coated thick electrode, and the positive pole piece is mainly prepared from a carbon-coated aluminum foil, an upper-layer coated positive pole slurry II and a lower-layer coated positive pole slurry I, by adding the high-liquid-retention powder liquid retention agent polyacrylate and the superconducting organic polymer material chain polymer polysulfur nitride PSN into the positive pole piece, a very high electrolyte can be absorbed and converted into an electrolyte, the electrolyte with the mass dozens of times of the mass of the positive pole piece can be converted into a colloid electrolyte, the electrolyte is locked, and in the subsequent cycle process of the battery cell, the battery cell can be continuously charged, so that the service life of the battery cell is prolonged. Due to the consumption of the electrolyte, a concentration difference value is formed, so that the e