Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of precursor of positive electrode material and preparation method of positive electrode material

A cathode material and precursor technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of uneven particle size and wide distribution range of cathode material precursors, and achieve a narrow distribution range and uniform particle size. , the effect of high tap density

Active Publication Date: 2012-02-08
BYD CO LTD
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the prior art, the particle size of the positive electrode material precursor is uneven and the distribution range is wide, thereby providing a preparation method of the positive electrode material precursor with uniform particle size distribution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of precursor of positive electrode material and preparation method of positive electrode material
  • Preparation method of precursor of positive electrode material and preparation method of positive electrode material
  • Preparation method of precursor of positive electrode material and preparation method of positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] A method for preparing a precursor of a positive electrode material, comprising: adding solution A and solution B to the bottom solution C for precipitation, controlling the pH between 10 and 12 during the precipitation process; after the precipitation is completed, separating and drying to obtain the precursor of the positive electrode material body;

[0024] The solution A is a solution of a metal source, and the metal source is one or more of a nickel source, a manganese source or a cobalt source; the solution B is a precipitation agent solution;

[0025] The bottom liquid C includes a solvent and a precipitation nucleating agent, and the general formula of the precipitation nucleating agent is

[0026]

[0027] or

[0028]

[0029] Among them, M, M 1 And M 2 Each is independently selected from one of Na, Li or K, n is selected from 1 or 2, R 2 -R 19 Each independently selected from C 1 -C 3 One of them.

[0030] Preferably, n is 1, R 2 -R 19 All are methyl.

[0031] More pref...

Embodiment 1

[0068] Solution A: NiSO 4 , CoSO 4 Aqueous solution, where Ni 2+ The concentration is 1.6mol / L, Co 2+ The concentration is 0.4mol / L.

[0069] Solution B: 8mol / L NaOH solution.

[0070] Precipitation nucleating agent: Disodium 2,4-di-tert-butylphenyl phosphate.

[0071] Bottom solution C: Dissolve the precipitation nucleating agent in an alcohol-water system (mass ratio of 1:2), and the concentration of the precipitation nucleating agent is 1.5 g / L.

[0072] Add 20L of bottom liquid C to a 100L precipitation reaction tank, and pass nitrogen gas into it as a protective gas, and control the stirring rate to 150rad / min.

[0073] Add solution A to the bottom solution C at a flow rate of 25 ml / min, and add solution B to the bottom solution C at the same time. And constantly monitor the pH in the precipitation reaction tank within the range of 11.7 to 11.8.

[0074] After the precipitation is completed, aging in the reaction tank for 120 minutes, and then suction filtration to obtain the preci...

Embodiment 2

[0078] The difference from Example 1 is that the concentration of the precipitation nucleating agent in the bottom liquid C is 2.5 g / L. The other parts are the same as in Example 1.

[0079] The precursor of the positive electrode material is obtained, which is recorded as A2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention which belongs to the technical field of lithium ion batteries concretely discloses a preparation method of a precursor of a positive electrode material. The preparation method comprises the following steps: 1, adding a solution A and a solution B to a base solution C to precipitate, and controlling the pH at 10-12 in the process of precipitation; and 2, separating, and drying to obtain the precursor of the positive electrode material, wherein the solution A is a metal solution of nickel, manganese or cobalt, the solution B is a precipitant solution, and the base solution C comprises a solvent and a precipitation nucleating agent which is an organic phosphate. The invention also discloses a preparation method of the positive electrode material. The precursor of the positive electrode material, prepared through the preparation method of the precursor of the invention, has the advantages of uniform particle size and narrow distribution range, so a case that the finally formed positive electrode material has the advantages of uniform particle size, narrow distribution range, high tap density, and high specific volume is effectively guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode material precursor and a preparation method of the positive electrode material. Background technique [0002] The cathode materials of lithium ion batteries are generally lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, and lithium nickel manganese cobalt oxide. There are many methods for synthesizing positive electrode materials, but most of them currently use precipitation methods to generate positive electrode material precursors, and then sinter the positive electrode material precursors and lithium source in an oxygen atmosphere to form the positive electrode material. [0003] Among them, the general steps of the precipitation method are as follows: a metal source such as a nickel source, a manganese source, and a cobalt source is mixed with a precipitation agent solution in a bottom solutio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/62
CPCY02E60/10
Inventor 李阳
Owner BYD CO LTD