MULTILAYER ANNULAR HOLE NICKEL-COBALT-ALUMINUM PRECURSOR, PREPARATION METHOD FOR PRECURSOR AND POSITIVE ELECTRODE MATERIAL

• Main Authors: HAO, Zhimin, WEN, Wanchan, ZHAO, Xiaojin, WANG, Wen, CHENG, Di, YIN, Zhengzhong, ZUO, Gaofeng, XU, Yunjun
• Format: Patent
• Language: English; French; German
• Published: 12.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present disclosure discloses a multilayer annular pore nickel-cobalt-aluminum precursor and a preparation method and a positive electrode material thereof. The precursor D50 is 8 to 20µm. It may be seen from a section diagram that there is a plurality of layers of annular pores in a secondary spherical particle structure, and a average porosity value of the section with a single particle or a plurality of particles is 6% to 14%. A co-precipitation reaction of nickel-cobalt mixed salt solution, alkali-aluminum solution, a complexing agent, and a precipitating agent is performed, a pH value and a concentration of aluminum solution at each stage are strictly controlled, and then working procedures of solid-liquid separating, washing, drying, mixing, sieving, and demagnetizing are performed to obtain the multilayer annular pore nickel-cobalt-aluminum precursor. The loose and porous morphology of the precursor is beneficial to obtain the positive electrode material by mixed lithium sintering.