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A lithium ion battery cathode slurry dispersing method

A lithium-ion battery and positive electrode slurry technology, which is applied in chemical instruments and methods, dissolution, mixers, etc., can solve the problems of poor dispersion effect, dispersion effect affecting battery capacity, battery consistency, and easy agglomeration

Inactive Publication Date: 2018-03-02
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the conductive agent generally uses nanoparticles with good performance, which generally have a large specific surface area and super high surface energy, but the conductive agent is prone to agglomeration in the process of mixing with the active material, and the dispersion effect is poor, while the active material The quality of the dispersion effect with the conductive agent can directly affect the size of the battery capacity and the consistency of the battery

Method used

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  • A lithium ion battery cathode slurry dispersing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] Include the following steps,

[0039] Step 1: Make glue, mix PVDF and NMP at a concentration of 5.5%, stir at a revolution speed of 25rpm / min, and a dispersion line speed of 12m / S for 60min;

[0040] Step 2: Stir the powder, stir the LFP and SP for 45 minutes at a revolution speed of 35 rpm / min and a dispersion line speed of 2.5 m / S.

[0041] Step 3: Stir in a muddy state, add the glue in step 1 to the mixture of LFP and SP in step 2, and adjust the solid content to 68.6% by adding NMP, at a revolution speed of 12rpm / min, and a dispersion line speed of 2.5m / s , stirred for 15 minutes, after scraping the dry material, continue to mix at a revolution speed of 32rpm / min, a dispersion line speed of 2.5m / s, and stir for 45 minutes;

[0042] Step 4: High-viscosity stirring. After adding NMP to 66% solid content in step 3, the revolution speed is 30rpm / min, and the dispersion line speed is 15m / s. Speed ​​21.5m / s, stirring for 45min for mixing;

[0043]Step 5: Viscosity adju...

Embodiment approach 2

[0047] Step 1: Make glue, mix PVDF and NMP at a concentration of 5.5%, stir at a revolution speed of 15rpm / min, and a dispersion line speed of 9m / S for 75min

[0048] Step 2: Stir the powder, stir the LFP and SP for 60 min at a revolution speed of 20 rpm / min and a dispersion line speed of 2.5 m / S.

[0049] Step 3: Stir in a muddy state, add the glue in step 1 to the mixture of LFP and SP in step 2, and adjust the solid content to 68.6% by adding NMP, at a revolution speed of 12rpm / min, and a dispersion line speed of 2.5m / s , stirred for 15 minutes, scraped the dry material and continued to mix at a revolution speed of 25 rpm / min and a dispersion line speed of 2.5 m / s, and stirred for 60 minutes;

[0050] Step 4: High-viscosity stirring. After adding NMP to 66% solid content in step 3, the revolution speed is 30rpm / min, the dispersion line speed is 15m / s, and after stirring for 15min, continue to revolve at a revolution speed of 40rpm / min. Speed ​​20m / s, stirring for 60min for...

Embodiment approach 3

[0055] Step 1: Make glue, mix PVDF and NMP at a concentration of 5.5%, stir at a revolution speed of 30rpm / min, and a dispersion line speed of 15.5m / S for 45min;

[0056] Step 2: Stir the powder, stir the LFP and SP for 30 minutes at a revolution speed of 40rpm / min and a dispersion line speed of 2.5m / S.

[0057] Step 3: Stir in a muddy state, add the glue in step 1 to the mixture of LFP and SP in step 2, and adjust the solid content to 68.6% by adding NMP, at a revolution speed of 12rpm / min, and a dispersion line speed of 2.5m / s , stirred for 15 minutes, scraped the dry material and continued to mix at a revolution speed of 40rpm / min, a dispersion line speed of 2.5m / s, and stirred for 30 minutes;

[0058] Step 4: High-viscosity stirring, after continuing to add NMP to 66% solid content in step 3, at a revolution speed of 30rpm / min, a dispersion line speed of 15m / s, after mixing for 15min, continue at a revolution speed of 50rpm / min, the dispersion line Speed ​​23m / s, stirring...

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Abstract

The invention belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a lithium ion battery cathode slurry dispersing method. The method includes 1) glue mixing, 2) powder stirring, 3) muddy stirring, 4) high-viscosity stirring, 5) viscosity adjusting and stirring, 6) viscosity adjusting and stirring, and 7) vacuum deaeration. Compared with conventional methods, the solid content of slurry prepared by the method can be greatly increased, dispersion effects are improved, the number of particle scratches is reduced, the solvent using amount is reduced, the cost is reduced, the first-time efficiency is increased, inner resistance is reduced, and cyclic performance of battery cores is improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery slurry production, in particular to a method for dispersing lithium ion battery positive electrode slurry. Background technique [0002] Lithium batteries have many advantages such as large specific capacity, long charge and discharge life, no memory effect, and low environmental pollution. Since commercialization, they have quickly replaced nickel-chromium and nickel-metal hydride batteries and are widely used in mobile phones, notebook computers, and cameras. and other portable appliances. And there is a tendency to develop into new fields such as electric vehicles, aerospace, and energy storage power stations. Compared with traditional 3C digital batteries, these new fields have more stringent requirements for lithium-ion batteries, especially higher requirements for battery cycle life, energy density, consistency of battery packs, and safety. [0003] The electrodes of lithium batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/10B01F15/00
CPCB01F2215/0495B01F33/80B01F33/834B01F35/22161B01F35/221422
Inventor 张竹
Owner CALB CO LTD
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