High nickel positive electrode material with uniform coating layer and preparation method thereof

• Main Authors: YUAN XUJUN, WANG ZUNZHI, SUN WEILI, SHE SHENGXIAN
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention discloses a high-nickel positive electrode material with a uniform coating layer and preparation method thereof. The preparation method comprises following steps: placing a highnickel positive electrode material in water for water washing, adding two or more kinds which can react with each other to generate water-insoluble coating inorganic salt substance, filtering, and rinsing with a low-boiling point organic solvent, pumping out, drying, sintering, cooling, and sieving to obtain a high nickel positive electrode material with the uniform coating layer. Since the coating is coated on surface of an active material through adopting a manner of reacting, stirring, while bonding, the active material can be more uniformly coated; the method reduces residual lithium on the surface of the positive electrode active material while stirring and coating in the water, and provides guarantee on safety and stability for the battery; the method forms a layer of new layered lithium metal oxide structur