▎ 摘　　要

NOVELTY - Improving long cycle performance of a layered positive electrode material thick electrode under high voltage, involves coating a slurry containing the layered positive electrode material, water-based binder, conductive agent and water-based solvent on a current collector to obtain a wet electrode sheet coated with the slurry, freezing the wet electrode sheet at low temperature, vaporizing and drying at low temperature and low pressure so that the aqueous solvent in the wet electrode sheet undergoes a transition from liquid phase to solid phase and to gas phase. During the process, the dry pole piece composition obtained after freezing and drying maintains the uniformity of the liquid phase slurry and the order of the solid phase slurry. A low tortuosity thick electrode is formed with directional arrangement of channels. The uniformity of electrochemical reaction in the electrode is improved and the long-cycle performance of the electrode is improved at high voltage. USE - Method for improving long cycle performance of layered positive electrode material thick electrode under high voltage, where the electrode is utilized for lithium batteries. ADVANTAGE - The method enables to maintain the uniformity of final dried electrode components and solid state of the liquid-phase slurry, to form a thick electrode with low tortuosity having aligned channels, to ensure sufficient electron and lithium ion transport network around each particle in the electrode and the uniformity of the electrochemical reaction in the thick electrode and to effectively avoid the cracking of the particles due to the volume change of various irregularities, thus improving long-term cycle stability.