Dry preparation of battery grade spherical cobaltosic oxide particle

Abstract

The invention relates to a wet preparation method of battery-level spherical cobaltosic oxide, which comprises the specific steps of: preparing cobalt salt into a first mixed solution with the concentration of 1-3mol / L; preparing a hydrate solution with the concentration of 2-10mol / L into a second mixed solution; preparing a complexing agent A with the concentration of 0.001-200g / L into a third mixed solution; introducing the three mixed solutions into a reaction vessel by adopting a parallel flow method; stirring the mixed solution intensively to cause the three solutions to react; adding a certain amount of oxidizer continually into a reaction system during the reaction process; aging the mixed solution for 2-48 hours under normal temperature; centrifugalizing, washing and drying the material; and calcining the mixture of a pretreated precursor and lithium salt under 750-1000 DEG C to obtain the lithium battery cathode material. The method has the advantage that the cobaltosic oxide powder can be directly obtained from the oxidation of a cobalt compound in the solution owing to the fact that the cobalt compound can be oxidized in the solution under alkaline condition. The material is a relatively ideal battery cathode material for mobile telephones, video cameras, laptops and portable electric appliances.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a wet method for preparing battery-grade spherical cobalt trioxide, a precursor of positive electrode materials for lithium ion batteries. Background technique [0002] Since Japan's Sony Corporation successfully developed lithium cobalt oxide cathode materials in 1991, lithium-ion batteries have rapidly developed towards industrialization and have been widely used in mobile phones, cameras, notebook computers, and portable appliances. Due to China's advantages in resources, labor, and national policies, the lithium-ion battery industry has developed rapidly and has strong international competitiveness. my country's lithium cobalt oxide production has developed rapidly in recent years, so the Co 3 o 4 demand has also increased rapidly. Battery Grade Co 3 o 4 As the main raw material of lithium cobalt oxide, the anode material of lithium-ion batterie...

AI Technical Summary

Problems solved by technology

Famous scholars such as Li Yadong reported that Na 2 CO 3 Preparation of Co for Precipitant 3 o 4 , the precipitate is difficult to achieve solid-liquid separation, and the impurity Na+ adsorbed on the colloidal particles is difficult to wash away; 4 HCO 3 As a precipitating agent, the resulting precipitate is basic cobalt carbonate. Although it is easy to separate solid-liquid and wash, it can only be obtained by high-temperature heat treatment. 3 o 4 , high energy consumption and poor particle morphology

Utilize NH 4 HCO 3 Prepare basic cobalt carbonate or cobalt carbonate as a precipitant, and then thermally decompose to obtain Co 3 o 4 , the existing problems are that incomplete precipitation causes a large amount of metal loss, a large amount of ammonia-containing wastewater needs to be treated, and the environmental protection issues involved are expected to be resolved