Washing process and preparation method of high-nickel polycrystalline ternary positive electrode material

• Main Authors: WEN YIFAN, YU YINGFENG, ZHANG JUN, CHENG ZHENG
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a washing process and a preparation method of a high-nickel polycrystalline ternary positive electrode material. The washing process comprises the following steps: homogenizingthe material subjected to primary sintering with ethanol, pulping, washing, and adding the ionic liquid and the grain boundary filler at the same time. According to the washing process disclosed by the invention, an ethanol-ionic liquid-grain boundary filling agent is adopted to replace a traditional washing process, so that the residual lithium amount on the surface of the high-nickel polycrystalline ternary positive electrode material and the sulfur content of a product are reduced, the low specific surface area of the ternary material is kept, the processability, safety performance and cycle performance of the material are improved, and the capacity of the material is not influenced. Compared with traditional aqueous solution system washing, a large amount of aqueous solution does not need to be consumed, and t