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Preparation method of positive electrode of lithium ion battery

A lithium-ion battery and positive electrode technology, which is applied in the field of preparation of the positive electrode of lithium-ion batteries, can solve the problems of small liquid retention capacity, electrolyte passing capacity, large particle size of ternary positive electrode materials, and influence on battery performance, so as to improve battery life. Liquid capacity and electrolyte passing capacity, low cost, and easy operation

Active Publication Date: 2021-06-08
河南克能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the existing lithium-ion battery positive electrode is to coat the ternary positive electrode slurry on the current collector, and the ternary positive electrode material accounts for the main proportion in the ternary positive electrode slurry, but due to the large particle size of the ternary positive electrode material, The specific surface area is small, and its liquid holding capacity and electrolyte passing capacity are small, which will greatly affect the performance of the battery cell

Method used

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  • Preparation method of positive electrode of lithium ion battery
  • Preparation method of positive electrode of lithium ion battery
  • Preparation method of positive electrode of lithium ion battery

Examples

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Effect test

Embodiment 1

[0044]A preparation method for a lithium ion battery positive electrode, comprising the following steps:

[0045] (1) Dry mix the ternary active material ME8E and the conductive agent SP for 1 hour, then add the mixed material into the PVDF glue, continue to stir for 2 hours, and then perform degassing treatment to obtain the ternary positive electrode slurry; the ternary active material , conductive agent SP, PVDF glue mass ratio is 100:2:1.5.

[0046] (2) Mix conductive agent VGCF and NMP at a mass ratio of 1:50, disperse with high-speed stirring equipment, disperse for 3-6 hours, and let it stand for 1 hour to observe whether the carbon conductive agent slurry is precipitated. If precipitation occurs, continue Stir or ultrasonically disperse until the dispersion is stable;

[0047] (3) Apply the ternary positive electrode slurry prepared in step (1) evenly on the upper and lower surfaces of the 15 μm thick aluminum foil with a spray coater, and the coating surface density ...

Embodiment 2

[0052] A preparation method for a lithium ion battery positive electrode, comprising the following steps:

[0053] (1) Dry mix the ternary active material ME8E and the conductive agent SP for 1 hour, then add the mixed material into the PVDF glue, continue to stir for 2 hours, and then perform degassing treatment to obtain the ternary positive electrode slurry; the ternary active material , conductive agent SP, PVDF glue mass ratio is 100:2:1.5.

[0054] (2) Mix conductive agent VGCF and NMP at a mass ratio of 1:50, disperse with high-speed stirring equipment, disperse for 3-6 hours, and let it stand for 1 hour to observe whether the carbon conductive agent slurry is precipitated. If precipitation occurs, continue Stir or ultrasonically disperse until the dispersion is stable;

[0055] (3) Use a spray coater to evenly coat the carbon conductive agent slurry prepared in step (2) on the upper and lower surfaces of aluminum foil with a thickness of 15 μm, the total thickness of ...

Embodiment 3

[0061] A preparation method for a lithium ion battery positive electrode, comprising the following steps:

[0062] (1) Dry mix the ternary active material ME8E and the conductive agent SP for 1 hour, then add the mixed material into the PVDF glue, continue to stir for 2 hours, and then perform degassing treatment to obtain the ternary positive electrode slurry; the ternary active material , conductive agent SP, PVDF glue mass ratio is 100:2:1.5.

[0063] (2) Mix conductive agent VGCF and NMP at a mass ratio of 1:50, disperse with high-speed stirring equipment, disperse for 3-6 hours, and let it stand for 1 hour to observe whether the carbon conductive agent slurry is precipitated. If precipitation occurs, continue Stir or ultrasonically disperse until the dispersion is stable;

[0064] (3) The ternary positive electrode slurry prepared in step (1) is evenly coated on the upper and lower surfaces of a 15 μm thick aluminum foil using a spray coater, and the coating surface dens...

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Abstract

The invention provides a preparation method of a positive electrode of a lithium ion battery, which comprises the following steps of: alternately applying one or more layers of ternary positive electrode slurry and carbon conductive agent slurry on the surface of a current collector, and drying and rolling after coating each time; according to the preparation method provided by the invention, the liquid retention capability of an electrode plate and the passing capability of electrolyte can be improved, so that the impedance of the electrode plate is improved, and the cycle performance of a battery cell is finally improved.

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 of a lithium ion battery. Background technique [0002] Lithium-ion secondary batteries have been widely used in daily life and industry due to their superior properties such as high energy density, long cycle life, low cost, and no memory effect. In particular, the relevant government departments have paid more and more attention to environmental issues in recent years. Coupled with the national policy orientation and the improvement and upgrading of battery pack energy density and safety performance by emerging electric car companies, people are paying more attention to electric vehicles (EVs), hybrid electric vehicles, etc. (HEV), etc. are becoming more and more confident. The above-mentioned electric vehicles and hybrid electric vehicles can completely replace gasoline vehicles, diesel vehicles, etc., and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1391H01M4/62H01M10/0525
CPCH01M4/0404H01M4/0435H01M4/0471H01M4/1391H01M4/625H01M10/0525Y02E60/10
Inventor 王红伟李少刚李洪涛郝世伟柯克
Owner 河南克能新能源科技有限公司