Preparation method of nickel cobalt lithium manganate

Abstract

The invention relates to the technical field of lithium batteries, in particular to a preparation method of nickel cobalt lithium manganate. The nickel salt, the cobalt salt and the manganese salt are mixed according to a certain proportion, the pH value is adjusted in the heating and stirring process, the reaction process can be effectively controlled, and the purity and quality of nickel cobalt lithium manganate are improved. Meanwhile, the preparation method is relatively low in cost, simple to operate and suitable for large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a method for preparing lithium nickel cobalt manganese oxide. Background Art

[0002] Lithium nickel cobalt manganese oxide is a common positive electrode material for lithium batteries. It has the advantages of high energy density and long life, and is widely used in mobile phones, electric vehicles and other fields. However, the traditional preparation method has some problems, such as high cost and complicated preparation process, which limits its further application. Summary of the invention

[0003] The present invention provides a low-cost and efficient method for preparing lithium nickel cobalt manganese oxide, aiming to solve the above problems.

[0004] The present invention is achieved through the following technical solutions: A method for preparing lithium nickel cobalt manganese oxide comprises the following steps: (1) mixing nickel salt, cobalt salt and manganese salt in a certain proportion to obtain a mixed salt solution; (2) adding hydroxide to the mixed salt solution to adjust the pH value to a predetermined range; (3) heating and stirring the mixed solution to allow the hydroxide to react with the mixed salt solution to form lithium nickel cobalt manganese oxide precipitate; (4) Filter, wash and dry the precipitate to obtain a nickel cobalt manganese oxide positive electrode material.

[0005] Compared with the prior art, the present invention has the following beneficial effects: By mixing nickel salt, cobalt salt and manganese salt in a certain proportion and adjusting the pH value during heating and stirring, the reaction process can be effectively controlled to improve the purity and quality of lithium nickel cobalt manganese oxide. At the same time, the preparation method has low cost, simple operation and is suitable for large-scale production. DETAILED DESCRIPTION

[0006] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0007] Example 1 A method for preparing lithium nickel cobalt manganese oxide of the present invention comprises the following steps: (1) Mix nickel salt, cobalt salt and manganese salt in a certain proportion to obtain a mixed salt solution. In this step, nickel salt, cobalt salt and manganese salt need to be mixed in a certain mass ratio. For example, they can be mixed in a ratio of nickel: cobalt: manganese = 1:1:1. After mixing these three salt substances in proportion, a mixed salt solution is obtained.

[0008] (2) Add hydroxide to the mixed salt solution and adjust the pH value to a predetermined range. In this step, hydroxide (such as sodium hydroxide, potassium hydroxide, etc.) needs to be added to the mixed salt solution, and the pH value of the solution is adjusted to a predetermined range at the same time. This pH value range needs to be specifically adjusted according to the experimental conditions. By adding hydroxide and adjusting the pH value, the ion reaction in the mixed salt solution can be promoted, thereby generating lithium nickel cobalt manganese oxide precipitate.

[0009] (3) Heat and stir the mixed solution to allow the hydroxide to react with the mixed salt solution to generate a lithium nickel cobalt manganese oxide precipitate. In this step, the mixed solution needs to be heated to a certain temperature and stirred continuously. This temperature and stirring time need to be determined specifically according to the experimental conditions. Heating and stirring can promote the reaction between the hydroxide and the mixed salt solution, thereby generating a lithium nickel cobalt manganese oxide precipitate.

[0010] (4) Filter, wash and dry the precipitate to obtain a nickel cobalt manganese oxide positive electrode material. In this step, the generated nickel cobalt manganese oxide precipitate needs to be filtered, washed and dried. By filtering and washing, impurities in the precipitate, such as unreacted salt substances, etc., can be removed. By drying, the water in the precipitate can be removed to obtain a dry nickel cobalt manganese oxide positive electrode material.

Claims

1. A method for preparing lithium nickel cobalt manganese oxide, characterized in that: The following steps are involved: (1) mixing nickel salt, cobalt salt and manganese salt in a certain proportion to obtain a mixed salt solution; (2) adding hydroxide to the mixed salt solution to adjust the pH value to a predetermined range; (3) heating and stirring the mixed solution to allow the hydroxide to react with the mixed salt solution to form lithium nickel cobalt manganese oxide precipitate; (4) Filter, wash and dry the precipitate to obtain a nickel cobalt manganese oxide positive electrode material.

2. The method for preparing lithium nickel cobalt manganese oxide according to claim 1, characterized in that: The ratio of nickel:cobalt:manganese is 1:1:

1.

3. The method for preparing lithium nickel cobalt manganese oxide according to claim 1, characterized in that: The hydroxide is sodium hydroxide or potassium hydroxide.

4. The method for preparing lithium nickel cobalt manganese oxide according to claim 1, characterized in that: The mixed solution is heated and stirred to allow the hydroxide to react with the mixed salt solution to form lithium nickel cobalt manganese oxide precipitate.

5. The method for preparing lithium nickel cobalt manganese oxide according to claim 1, characterized in that: By heating and stirring, the reaction between the hydroxide and the mixed salt solution can be promoted to generate lithium nickel cobalt manganese oxide precipitate.

6. The method for preparing lithium nickel cobalt manganese oxide according to claim 1, characterized in that: In step (4), the generated lithium nickel cobalt manganese oxide precipitate needs to be filtered, washed and dried.

7. The method for preparing lithium nickel cobalt manganese oxide according to claim 1, characterized in that: In step (4), impurities in the precipitate, such as unreacted salt substances, etc., can be removed by filtering and washing.

8. The method for preparing lithium nickel cobalt manganese oxide according to claim 1, characterized in that: In step (4), water in the precipitate can be removed by drying to obtain a dry lithium nickel cobalt manganese oxide positive electrode material.