▎ 摘　　要

NOVELTY - Cathode has a first polymer layer attached to a current collector. A second polymer layer is attached to the first polymer layer. Diameter of a hole in the first polymer layer is greater than 1 microns. Diameter of the hole in the second polymer layer is 0.001-1 times of the diameter of the hole in the first polymer layer. The first polymer layer is provided with a first polymer layer and a second polymer layer. The second polymer layer is provided with a second polymer layer and a third polymer layer. The second polymer layer is provided with a fourth polymer layer. USE - Lithium ion battery cathode used in a lithium ion battery of a lithium ion battery module (all claimed). ADVANTAGE - The lithium ion battery containing the cathode has good cycle performance and multiplying power performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the negative electrode, which involves coating the slurry containing the first polymer and the pore former on the current collector, removing the first solvent to form a first polymer layer, and obtaining a first negative electrode sheet, coating the slurry containing the second polymer on the first polymer layer, removing the second solvent to form a second polymer layer, and obtaining a second negative electrode sheet, removing pore former in the second negative electrode sheet to form holes in the first polymer layer to obtain the negative electrode, coating slurry containing the first polymer and the reactive porogen on the current collector, removing the third solvent to form the first polymer layer, and obtaining the first negative electrode sheet, reactive porogen react with the third solvent to generate a gas or a soluble compound to form pores in the first polymer layer, coating the slurry containing the second polymer on the first polymer layer and removing the fourth solvent to obtain a negative electrode coated with the second polymer layer; (2) a lithium ion battery, which comprises the negative electrode; and (3) a battery module, which comprises the lithium ion battery.