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Preparation method of high-rate lithium cobalt oxide

A high-rate lithium cobaltate and synthetic lithium cobaltate technology, which is applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of damaging the coating, accelerating the decomposition of lithium cobaltate materials, and affecting the service life of batteries. Reach the effect of reducing the concentration of residual alkali, improving the rate performance and improving the conductivity

Pending Publication Date: 2022-03-15
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At the same time, during the high-voltage lithium cobalt oxide synthesis process, excess lithium will form surface residues on the surface of the material, and the residual lithium (LiOH and Li 2 CO 3 ) will start the decomposition reaction of the electrolyte on the interface between the positive electrode material and the surface coating to generate CO 2 , O 2 , N 2 Gases such as CO and CO can easily lead to the expansion behavior inside the battery, thereby destroying the coating on the surface of the lithium cobalt oxide material, accelerating the decomposition of the lithium cobalt oxide material, and affecting the service life of the battery. The problem of gas generated by the decomposition of residual lithium

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Embodiment 1

[0026] A method for preparing high-magnification cobaltate, comprising the steps of:

[0027] (1) Based cobalt oxide, battery level Li 2 CO 3 Nano MgO, Nano Al 2 O 3 For the raw material, the zodes are synthesized for one-time product, the synthesis process is: Li / ME: 1.008, doped element Mg: 2000ppm, Al: 1200ppm; After the raw material is measured, the plow mixer is put into the plow mixer, the spindle frequency is 45 Hz, the flying knife frequency is 30 Hz, Mix time 45min.

[0028] (2) One sintering process: sintering temperature: 990 ° C -1000 ° C, intraperitivity of 30 L / min, holding time 26h, exhaust gas

[0029] (3) A sintered product pulverization process: upper pair of roller spacing 20mm, lower pair of roller spacing 10mm; airflow grinding frequency 45Hz, gas source pressure 0.8MPa, nozzle pressure 0.6MPa, grading frequency 35 Hz; primary particle size 4.0-6.0um.

[0030] (4) Transfer a liquid phase, the solid-liquid ratio is 1.5: 1, the liquid phase is pure water, th...

Embodiment 2

[0033] A method for preparing high-magnification cobaltate, comprising the steps of:

[0034] (1) Based cobalt oxide, battery level Li 2 CO 3 Nano MgO, Nano Al 2 O 3 For raw material synthesis of lithium cobaltate, the synthesis process is: Li / ME: 1.005, doped element Mg: 1500 ppm, Al: 1000 ppm; the raw material is measured after the plow mixer is mixed, the spindle frequency is 45 Hz, the flying knife frequency is 30Hz, Mix time 45min.

[0035] (2) One sintering process: sintering temperature: 950 ° C, intravation volume 10L / min, holding time 15h, exhaust gas;

[0036] (3) A sintered product pulverization process: upper pair of roller spacing 20mm, lower pair of roller spacing 10mm; airflow grinding frequency 45Hz, gas source pressure 0.8MPa, nozzle pressure 0.6MPa, grading frequency 35 Hz; primary particle size 4.0-6.0um.

[0037] (4) Transfer a liquid phase, the solid-liquid ratio is 1.5: 1, the liquid phase is pure water, the conductivity is 3 (Po 4 ) 2 , Coating 2500 ppm;...

Embodiment 3

[0040] A method for preparing high-magnification cobaltate, comprising the steps of:

[0041] (1) Based cobalt oxide, battery level Li 2 CO 3 Nano MgO, Nano Al 2 O 3 For raw materials, the zodes are synthesized for one-time product, the synthesis process is: Li / ME: 1.010, doped element Mg: 2500 ppm, Al: 1500 ppm; after the raw material is measured, the plow mixer is put into the plow mixer for mixing, the spindle frequency is 45 Hz, the flying knife frequency is 30 Hz, Mix time 45min.

[0042] (2) One sintering process: sintering temperature: 1000 ° C, intake volume 40L / min, holding time 30 h, exhaust gas

[0043] (3) A sintered product pulverization process: upper pair of roller spacing 20mm, lower pair of roller spacing 10mm; airflow grinding frequency 45Hz, gas source pressure 0.8MPa, nozzle pressure 0.6MPa, grading frequency 35 Hz; primary particle size 4.0-6.0um.

[0044] (4) Transfer the liquid phase, the solid-liquid ratio is 1.5: 1, the liquid phase is pure water, the ...

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Abstract

The invention discloses a preparation method of high-magnification lithium cobalt oxide. The preparation method comprises the following steps: synthesizing a lithium cobalt oxide defective product, carrying out primary sintering, crushing and controlling the target particle size D50 to be 4-6 [mu] m; coating the crushed product with a coating material, carrying out secondary sintering, and crushing, grading and demagnetizing the sintered material to obtain a target product. According to the method disclosed by the invention, the rate capability of the material is improved by controlling the size of single crystal particles and doping trace metal elements. Phosphate is used for modifying the surfaces of material particles, on one hand, residual lithium on the surfaces of the materials is neutralized, and the content of residual alkali on the surfaces of the materials is reduced; on the other hand, direct contact between the active particles and the electrolyte is isolated, and the safety performance of the total battery is improved. Meanwhile, compared with a traditional production line method, the method is small in change and suitable for rapid industrialization.

Description

Technical field [0001] The present invention relates to the field of lithium ion batteries, and more particularly to a method of preparing high magnification cobaltate. Background technique [0002] Lithium cobaltate material is the most mature and maximum cathode material currently commercialized, and its production process is mature, and the industrialization technology route is complete. With the rapid development of the new energy market, people put forward higher requirements for the energy density of lithium-ion batteries, and lithium cobaltate materials are widely used in communication, consumer electronics and computers. Application prospects. With the comprehensive expansion of 5G technology, the application scenarios of various mobile devices will be more and more extensive, and the source of power - the demand for energy storage batteries also presents an explosive growth, providing a broad growth space for lithium cobaltate materials. . With the development of the mar...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01M4/525H01M4/62H01M10/0525
CPCC01G51/42H01M4/62H01M4/525H01M10/0525C01P2006/40Y02E60/10
Inventor 许开华张银鹏杨克涛王彦刚宋彦芳张军丽杨荣
Owner GEM JIANGSU COBALT IND CO LTD