Positive electrode material as well as stability judgment method and application thereof

A technology of positive electrode material and determination method, applied in the direction of analyzing materials, battery electrodes, using mechanical devices, etc., can solve the problems of material damage, material degradation performance, coating thickness, etc., and achieve excellent processability and electrochemical performance. , The stability matching degree is consistent, and the stability is good.

Pending Publication Date: 2022-04-05
SHANGHAI RUIPU ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes may cause damage to the material, exposing the nascent surface of the material to the slurry, resulting in an increase in the alkalinity of the slurry, resulting in a gel
[0007] CN107732199A discloses a positive electrode material of a fluorine-containing lithium ion battery, which is coated by liquid phase coating and evaporated to dryness, and the coating agent is used to absorb the residual alkali on the surface, but because the method is more complicated, and an inert gas protection is required during the evaporated to dryness process , if the residual alkali is relatively high, it will cause the surface coating layer of the material to be too thick, which will affect the performance of the material
LiOH and Li on the surface of high-nickel cathode materials can be removed by water washing process 2 CO 3 Wash it off, but the washing process will cause the lithium in the internal lattice of the material to dissolve into the aqueous solution after washing, so that the internal structure of the material will be damaged and the cycle performance of the material will be seriously attenuated.

Method used

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  • Positive electrode material as well as stability judgment method and application thereof
  • Positive electrode material as well as stability judgment method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This embodiment provides a positive electrode material (D50 is 2 μm). After the positive electrode material passes through the determination method of the above specific embodiment, the difference between n-m is shown in Table 1, and the chemical formula of the positive electrode material is also shown in Table 1.

[0063] The conditions of ball milling are:

[0064] In this embodiment, the PM100 equipment of Laichi Company is selected, and 9 zirconia grinding beads with a diameter of 10mm and 20g of positive electrode material are added to the material tank, that is, the volume-to-mass ratio of the ball milling beads to the positive electrode material is 235.5mm 3 / g, run at 300rpm for 60min. The diameter of the sun gear of this equipment is 0.141m, and the acceleration g of the ball mill can be calculated to be 69.5m / s 2 .

[0065] The preparation method of the cathode material provided in this embodiment is as follows:

[0066] Choose Ni 0.6 co 0.1 m 0.3 (OH) ...

Embodiment 2

[0068] This example provides a positive electrode material (D50 is 3.2 μm). After the positive electrode material passes through the determination method of the above specific embodiment, the difference between n-m is shown in Table 1, and the chemical formula of the positive electrode material is also shown in Table 1.

[0069] The conditions of ball milling are:

[0070] In this embodiment, the PM100 equipment of Laichi Company is selected, and 10 zirconia grinding beads with a diameter of 10mm and 21g of positive electrode material are added to the material tank, that is, the volume-to-mass ratio of the ball milling beads to the positive electrode material is 250mm 3 / g, run at 350rpm for 45min. The diameter of the sun gear of this equipment is 0.141m, and the acceleration g of the ball mill can be calculated to be 69.5m / s 2 .

[0071] The preparation method of the cathode material provided in this embodiment is as follows:

[0072] Choose Ni 0.6 co 0.1 m 0.3 (OH) 2 ...

Embodiment 3

[0074] This example provides a positive electrode material (D50 is 4 μm). After the positive electrode material passes through the determination method of the above specific embodiment, the difference between n-m is shown in Table 1, and the chemical formula of the positive electrode material is also shown in Table 1.

[0075] The conditions of ball milling are:

[0076] In this embodiment, the PM100 equipment of Laichi Company is selected, and 8 zirconia grinding beads with a diameter of 10mm and 20.5g of positive electrode material are added to the material tank, that is, the volume-to-mass ratio of the ball milling beads to the positive electrode material is 204.3mm 3 / g at a speed of 300rpm for 50min. The diameter of the sun gear of this equipment is 0.141m, and the acceleration g of the ball mill can be calculated to be 69.5m / s 2 .

[0077] The preparation method of the cathode material provided in this embodiment is as follows:

[0078] Choose Ni 0.6 co 0.1 m 0.3 (...

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Abstract

The invention provides a positive electrode material as well as a stability judgment method and application thereof. The positive electrode material is of an alpha-NaFeO2 structure, the pH value of the positive electrode material before ball milling is m, the pH value of the positive electrode material after ball milling is n, n-m is smaller than or equal to 0.15, and the positive electrode material is a nickel-cobalt-manganese or nickel-cobalt-aluminum ternary material and can be doped and coated. According to the positive electrode material provided by the invention, the pH value difference is within a certain range before and after ball milling, the stability is good, and the material has relatively excellent machinability and electrochemical performance. According to the positive electrode material provided by the invention, local gelling caused by dispersion processes such as stirring in a slurry preparation process in a positive electrode slurry preparation process is avoided, a prepared positive electrode plate has lower diaphragm resistance, and a prepared battery also has lower direct current impedance. The method for judging the stability of the positive electrode material is high in accuracy, and the finally obtained result is extremely matched with the stability matching degree of the positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a positive electrode material and a determination method and application of the stability thereof. Background technique [0002] Lithium-ion batteries are the third generation of small batteries after nickel-cadmium batteries and nickel-metal hydride batteries. As a new type of chemical power source, it has the outstanding advantages of high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low temperature performance, no memory, no pollution, etc. The batteries required by electrical appliances meet the dual requirements of small size, light weight and environmental protection. They are widely used in small electronic devices such as mobile communications, notebook computers, and video cameras. They are also ideal power sources for future electric vehicles. [0003] With α-NaFeO 2 The lithium-nicke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525G01N19/00G01N15/02
CPCY02E60/10
Inventor 曹辉郭颖颖侯敏刘婵
Owner SHANGHAI RUIPU ENERGY CO LTD
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