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Process for preparing oil slurry of lithium ion battery

A lithium-ion battery and preparation process technology, which is applied in the field of preparation of lithium-ion battery oily slurry, can solve the problems of easy gelation of oily slurry, poor adhesion of pole pieces, poor consistency and stability of slurry, etc., and achieve reduction Effect of cross-linking agglomeration and reducing cross-linking activity

Active Publication Date: 2012-09-12
DONGGUAN AMPEREX TECH
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  • Abstract
  • Description
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Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation process of lithium-ion battery oily slurry in view of the deficiencies of the prior art, which can prevent the slurry from gelling, improve the consistency and stability of the slurry, and thereby improve the To improve the consistency and cycle performance of the lithium-ion battery capacity, to overcome the oily slurry in the prior art, which is easy to gel, poor consistency and stability of the slurry, poor adhesion of the pole piece, and the resulting battery capacity lack of consistency

Method used

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  • Process for preparing oil slurry of lithium ion battery

Examples

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Effect test

Embodiment 1

[0028] Preparation of positive electrode slurry and positive electrode sheet:

[0029] Lithium cobaltate (LCO) is used as the positive electrode active material, and the positive electrode slurry containing the active material is formulated according to the formula. The solid content of the slurry includes 90wt% of the positive electrode active material, 5wt% of polyvinylidene fluoride (PVDF ) (bonding agent), 5wt% conductive carbon (conductive agent). The slurry uses NMP as a true solvent, the true solvent accounts for 95wt% of the total solvent (i.e. the sum of the latent solvent and the true solvent), the latent solvent is methyl ethyl ketone, the latent solvent accounts for 5wt% of the total solvent, and the solid content of the slurry is 75%. , first put the true solvent and polyvinylidene fluoride (PVDF) into the stirrer, stir at 50±1°C, and then add conductive carbon powder to stir and disperse after the dissolution is complete. At this stage, the slurry temperature is ...

Embodiment 2

[0035] The difference from Example 1 is that lithium nickelate (LNO) is used as the positive electrode active material, the latent solvent is diisobutyl ketone, and the latent solution accounts for 20 wt% of the total solvent.

[0036] The preparation process of the slurry is as follows: first put N-methylpyrrolidone and polyvinylidene fluoride (PVDF) into the stirrer, stir at 45±1°C, and then add conductive carbon powder to stir and disperse after the dissolution is complete. At this stage, the temperature of the slurry is controlled at 45±1°C; after dispersing for 2 hours, lower the temperature of the slurry to 25±1°C, then add the latent solvent diisobutyl ketone, stir for 1.5 hours, and control the temperature at 25±1°C; finally add The active material lithium nickelate (LNO) was stirred for 3 hours to make the final slurry, and the temperature was controlled at 25±1°C.

[0037] Others are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0039] The difference from Example 1 is that lithium manganate (LMO) is used as the positive electrode active material, the latent solvent is isophorone, and the latent solution accounts for 30 wt% of the total solvent.

[0040] The preparation process of the slurry is as follows: first put N-methylpyrrolidone and polyvinylidene fluoride (PVDF) into the stirrer, stir at 54±1°C, and then add conductive carbon powder to stir and disperse after the dissolution is complete. At this stage, the slurry temperature is controlled at 54±1°C; after 4 hours of dispersion, the slurry temperature is lowered to 21±1°C, and then the latent solvent isophorone is added, stirred for 1.5 hours, and the temperature is controlled at 21±1°C; finally added The active material lithium manganate (LMO) was stirred for 4 hours to make the final slurry, and the temperature was controlled at 21±1°C.

[0041] Others are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries and in particular relates to a process for preparing the oil slurry of a lithium ion battery. The process comprises the following steps of: 1, adding an organic true solvent and an adhesive into a stirring tank, stirring at the temperature of 45 to 55 DEG C to completely dissolve the adhesive, and thus obtaining an adhesive solution; 2, adding a conductive additive into the adhesive solution which is obtained in the step 1, stirring at the temperature of 45 to 55 DEG C, and then cooling to 20 to 35 DEG C; 3, adding a latent solvent into a solution which is cooled in the step 2, and stirring at the temperature of 20 to 35 DEG C; and 4, adding an active material into the solution which is obtained in the step 3, stirring at the temperature of 20 to 35 DEG C, and thus obtaining the oil slurry. Compared with the prior art, the process for preparing the oil slurry of the lithium ion battery has the advantages that by adding the latent solvent in the slurry preparation process and controlling stirring temperature by stages, gelling of the slurry can be prevented, the stability and consistency of the slurry can be improved, a pole piece with high adhesion force can be obtained, and the lithium ion battery which is prepared by using the pole piece is high in capacity consistency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a preparation process of oily slurry for lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, high operating voltage, wide application temperature range, and long cycle life, lithium-ion batteries are widely used as power sources for various mobile devices, even in aviation, aerospace, navigation, automobiles, medical equipment and other fields. Gradually replace other traditional batteries, especially its high energy density has made an important contribution to the miniaturization of mobile devices. [0003] The positive and negative electrode slurries of lithium-ion batteries are mainly divided into oily and water-based. At present, the negative electrode active material in the lithium battery industry is mainly graphite, which mainly adopts water-based formula technology. The adhesive is mainly water-based styrene-bu...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567
CPCY02E60/10
Inventor 赖旭伦谭欣欣柳娜邓耀明徐磊敏华斌许瑞
Owner DONGGUAN AMPEREX TECH
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