Abstract: Provided is a method for preparing a secondary battery including a battery cell. The secondary battery includes a negative electrode. The method includes: preparing a negative electrode slurry, coating the negative electrode slurry on the negative current collector, and then drying and compacting the negative electrode slurry to form a negative electrode material coating, thereby obtaining the negative electrode. Preparing the negative electrode slurry includes: dry blending a negative electrode active material, a conductive agent and a dispersant to obtain a dry blend; kneading the dry blend with a part of the first solvent to obtain a kneaded material; subjecting the kneaded material, the remaining part of the first solvent, the second solvent to a first wet blending to obtain a first wet blend; and subjecting the first wet blend, a thickener and a binder to a second wet blending to obtain the negative electrode slurry.

Abstract: A Cathode material and a preparation method therefor and use thereof are provided. The cathode material includes a cathode active substrate, and a surface of the cathode active substrate is coated with a carbon coating layer, wherein a surface of the carbon coating layer has an esterophilic group. The invention changes the surface energy of the carbon coating layer by introducing the esterophilic carbonyl to the surface of the carbon coating layer of the cathode active substrate, thereby significantly improving the wettability of the cathode active particles to the electrolyte. Moreover, the bulk structure of the active material is not changed, so the electrochemical performance of the cathode active material is guaranteed. The cathode plate prepared by the invention shows excellent wettability in the electrolyte, and a prepared battery shows low internal resistance, high energy efficiency and other characteristics.