A kind of wet-process zirconium-doped concentration gradient nickel-cobalt-aluminum ternary precursor and its preparation method

Abstract

A kind of wet-process zirconium-doped concentration gradient nickel-cobalt-aluminum ternary precursor and preparation method thereof, the chemical general formula of the nickel-cobalt-aluminum ternary precursor is Ni x CoyAl z (OH) 2 , where x+y+z=1, and 0.3≤x≤0.9, 0.01≤y≤0.4, 0.01≤z≤0.4, the Zr element accounts for 0.001%-3% of the total mass of the nickel-cobalt hydroxide precursor; ternary The precursor is composed of three layers, the inner layer is zirconium-doped nickel-cobalt binary precursor, the molecular formula is: Ni x co y (OH) 2 , whose outer layer is a ternary precursor of zirconium-doped nickel-cobalt-aluminum, whose molecular formula is: Ni x co y al z (OH) 2 , the intermediate layer is a concentration gradient precursor between the zirconium-doped nickel-cobalt binary precursor and the zirconium-doped nickel-cobalt-aluminum ternary precursor, and the present invention also includes the preparation method of the nickel-cobalt-aluminum ternary precursor. The zirconium-doped nickel-cobalt-aluminum ternary precursor of the present invention has narrow particle size distribution and good particle morphology; the complexation controls the crystallization co-precipitation to make the doping elements uniform, and the positive electrode precursor prepared by using it has high specific capacity, good cycle stability and processing performance Well, stable performance.

Description

technical field [0001] The invention relates to the technical field of manufacturing a zirconium-doped concentration gradient nickel-cobalt-aluminum ternary precursor, in particular to a wet-process zirconium-doped concentration gradient nickel-cobalt-aluminum ternary precursor and a preparation method thereof. Background technique [0002] As a new type of green battery, lithium-ion batteries have many advantages such as high voltage, specific energy, and low environmental pollution. They have been widely used in the field of digital products, and are gradually expanding to the fields of electric vehicles, satellites, and aerospace. High energy and high density are the development direction of lithium-ion power batteries in the future. As an important material that affects the performance of lithium-ion power batteries, the research and development of positive electrode precursors has become the focus of the industry. [0003] Lithium-ion power batteries have high requireme...

AI Technical Summary

Problems solved by technology

The industrialized preparation of nickel-cobalt-aluminum ternary positive electrode materials adopts solid-phase doping of aluminum elements. Generally, nickel-cobalt or nickel-cobalt-manganese hydroxides are prepared first, and then the precursors are mixed with lithium salts and small-particle aluminum compounds. High-temperature treatment is difficult to achieve homogenization

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