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Positive electrode slurry, preparation method thereof, positive electrode sheet and lithium ion battery

A technology of positive electrode slurry and positive electrode sheet, which is applied in the field of battery preparation, can solve the problems of difficult dispersion, prolonged stirring time, poor dispersion effect, etc., and achieve the effect of excellent electrochemical performance and high capacity density

Inactive Publication Date: 2019-06-14
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CNT itself is not easy to disperse, so it is necessary to use a glue-making process to promote the dispersion of CNT, but the dispersion effect of this method is still not good, and the glue-making process will increase the stirring time of the entire slurry, reduce production efficiency, and increase production costs.

Method used

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  • Positive electrode slurry, preparation method thereof, positive electrode sheet and lithium ion battery
  • Positive electrode slurry, preparation method thereof, positive electrode sheet and lithium ion battery
  • Positive electrode slurry, preparation method thereof, positive electrode sheet and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Laboratory scale: ambient temperature is 2523°C, humidity≦40%RH

[0041] (1) Add 9,000 g of polyvinylidene fluoride into the mixer, and then add 184.62 g of lithium iron phosphate active material, and stir for 30 minutes at a speed of 35 rpm for revolution and 2,000 rpm for autorotation.

[0042] (2) Add 923.08 g of carbon nanotubes, and stir for 30 minutes at a speed of 35 rpm for revolution and 2500 rpm for autorotation.

[0043] (3) Add 2063.35g of N-methylpyrrolidone, stir for 30min at a speed of 35 rpm with revolution and 2200 rpm with rotation, and measure the solid content of the slurry at this time to be 75%, see the slurry state diagram figure 1 Middle a.

[0044] (4) Add 1737.50 g of N-methylpyrrolidone, and stir for 120 min at a speed of 35 rpm for revolution and 2200 rpm for autorotation.

[0045] (5) Add 2353.00 g of N-methylpyrrolidone, and stir for 120 min at a speed of 35 rpm and 2200 rpm for rotation to obtain the positive electrode slurry of Example ...

Embodiment 2

[0050] On the basis of Example 1, the production scale is enlarged by 10 times, and the ambient temperature is 2523°C, humidity≦40%RH

[0051](1) Add 90 kg of polyvinylidene fluoride into the mixer, then add 1846.2 lithium iron phosphate active material, and stir for 30 minutes at a speed of 35 rpm for revolution and 2000 rpm for autorotation.

[0052] (2) Add 9230.8 g of carbon nanotubes, and stir for 30 minutes at a speed of 35 rpm for revolution and 2500 rpm for rotation.

[0053] (3) Add 20 kg of N-methylpyrrolidone, stir for 30 minutes at a speed of 35 rpm for revolution and 2200 rpm for rotation, and measure the solid content of the slurry at this time to be about 75%.

[0054] (4) Add 17 kg of N-methylpyrrolidone, and stir for 120 min at a speed of 35 rpm for revolution and 2200 rpm for autorotation.

[0055] (5) Add 23kg of N-methylpyrrolidone, stir for 120min at a speed of 35 rpm with revolution and 2200 rpm with rotation, to obtain the positive electrode slurry of E...

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Abstract

The invention relates to a positive electrode slurry, a preparation method thereof, a positive electrode sheet and a lithium ion battery. The preparation method of the positive electrode slurry comprises the following steps: uniformly mixing an adhesive, carbon nanotubes and an active material to obtain the mixed dry powder; and adding an organic solvent into the mixed dry powder in batches, and stirring the organic solvent after each addition. After the first batch of organic solvent is added, the solid content of the slurry is 72% 80%, the stirring process between the addition of the first batch of organic solvent and the addition of the second batch of organic solvent is a knead process. The preparation method of the positive electrode slurry can uniformly disperse the carbon nanotubeswithout adopting a gluing process, thereby ensuring the electrochemical performance of the battery and reducing the production cost.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a positive electrode slurry and a preparation method thereof, a positive electrode sheet and a lithium ion battery. Background technique [0002] With the development of the lithium battery industry, the requirements for battery energy density are getting higher and higher, and battery factories are pursuing the production of high energy density batteries. In terms of battery design, the most direct way to increase energy density is to increase the energy density in the original battery design. The solution is to increase the loading of the positive electrode material, that is, the ratio of the active material. The Loading of the active material in the traditional battery is low, this is mainly because the conductivity of the active material such as lithium iron phosphate itself is poor, so a certain proportion of conductive agent needs to be added when stirring, but ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M10/0525H01M10/058B82Y30/00
CPCY02E60/10Y02P70/50
Inventor 宗丽娟
Owner SOUNDON NEW ENERGY TECH CO LTD
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