High-density spherical nickel-cobalt-aluminum precursor material and preparation method thereof

Abstract

The invention discloses a high-density spherical nickel-cobalt-aluminum precursor material. The chemical molecular formula of the nickel-cobalt-aluminum precursor material is Ni(1-x-y)CoxAly(OH)(2+y); the tap density of the nickel-cobalt-aluminum precursor material is 1.8-2.4 g / cm3; the material is spherically granular; the average particle size of the material ranges from 6 to 17 microns. The invention also discloses a preparation method of the precursor material. The preparation method comprises the following steps of: firstly, evenly mixing an aluminum salt with a complexing agent; secondly, evenly mixing a nickel salt with a cobalt salt solution; adding the mixed solution, the complexing agent and a precipitator solution to a reactor in parallel for continuous coprecipitation reaction, controlling the pH value in the reaction process within the range from 11 to 12, keeping the materials stay in the reactor not more than 20 h, performing solid-liquid separation after stable reaction, and finally, aging, washing and drying the solid material to obtain the high-density spherical nickel-cobalt-aluminum precursor material. The aluminum element in the high-density spherical nickel-cobalt-aluminum precursor material provided by the invention can be combined with nickel and cobalt elements evenly; and the tap density of the high-density spherical nickel-cobalt-aluminum precursor material is higher.

Description

technical field [0001] The invention relates to a precursor material for positive electrode materials of lithium ion batteries and a preparation method thereof, in particular to a precursor material for nickel cobalt aluminum positive electrode materials in lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are already widely used in various mobile electronic products (such as mobile phones, cameras, notebook computers, etc.), and will be increasingly used in fields such as electric vehicles. In order to meet the growing needs of these application fields, the demand for lithium-ion secondary batteries with larger capacity, lighter weight and smaller size is increasing. Therefore, the specific capacity performance of lithium-ion battery cathode materials is proposed. Come higher demands. [0003] Among the high-capacity positive electrode materials that can be applied to lithium-ion batteries, high-nickel-based positiv...

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Problems solved by technology

[0005] Ni was synthesized by chemical co-precipitation method 1-x-y co x al y (OH) 2+y In the process of precursor materials, since aluminum ions are +3 valence, it is difficult to form a uniform single layer structure with +2 valence ion elements such as nickel and cobalt, which makes it difficult for aluminum elements to form a uniform distribution in the precursor material. state, which will result in unsatisfactory electrical properties of the nickel-cobalt-aluminum cathode material prepared using this raw material

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