Lithium ion battery slurry, preparation method of the lithium ion battery slurry, and lithium ion battery

A lithium-ion battery and slurry technology, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, and mixing methods, can solve problems such as affecting battery capacity, having preferential reaction points, and uneven dressing of electrode pole pieces

Active Publication Date: 2012-10-17
SHENZHEN BAK POWER BATTERY CO LTD
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Problems solved by technology

[0003] However, during the stirring process of the above two methods, powders such as active materials and conductive agents can easily form "ash bags" and disperse in the slurry, resulting in uneven mixing of the slurry, making the electrode pad dressing after pulling the slurry Inhomogeneous, with localized "bumps" and bubble "spots" on the dra

Method used

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  • Lithium ion battery slurry, preparation method of the lithium ion battery slurry, and lithium ion battery

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preparation example Construction

[0024] A method for preparing lithium-ion battery slurry in an embodiment includes the following steps.

[0025] Step S101 , using an adhesive to prepare a glue solution with a concentration of 3%-7%.

[0026] The adhesive can be dissolved in a solvent to form a glue solution with a mass concentration of 3% to 7%. Among them, the binder is preferably one of styrene-butadiene rubber (SBR), sodium carboxymethyl cellulose (CMC), polyvinylidene fluoride (PVDF), polyacrylate, polyurethane or a mixture thereof. The solvent can be a common solvent, preferably water or N-methylpyrrolidone (NMP). The concentration of the above-mentioned glue solution cannot be made too high, preferably in the range of 3% to 7%. The glue solution of this concentration is easy to prepare, and can reduce the formation of micelles when added to the powder later.

[0027] Step S102, uniformly mixing the active material and the conductive agent in a three-arm planetary mixer at a low speed to form a powder...

Embodiment 1

[0050] Put a certain proportion of graphite and carbon black into a three-arm planetary mixer, and mix uniformly for 10 minutes at a speed of 5 rpm to form a powder. Weigh NMP with a mass ratio of 50:50 to the powder. After mixing the mixed powder with 8% of the total NMP for one hour, add the remaining 92% of NMP and 35% of the total glue solution for the first dilution, and pass hot water of 50 degrees into the jacket Heat was applied with stirring at top speed for 1.5 hours. Then add the remaining 65% of the glue for the second dilution, first stir at low speed for 10 minutes, and then stir at the highest speed for 2 hours to form a slurry.

Embodiment 2

[0052] A certain proportion of LiFePO 4 and carbon nanotubes were put into a three-arm planetary mixer, and mixed uniformly for 30 minutes at a speed of 8 rpm to form a powder. Weigh NMP with a powder mass ratio of 55:4. After mixing the mixed powder with 1% of the total NMP for one hour, add the remaining 99% of NMP and 20% of the total glue for the first dilution, and pass hot water at 40 degrees into the jacket Heat was applied with stirring at top speed for 1.5 hours. Then add the remaining 80% glue solution for the second dilution, first stir at low speed for 5 minutes, and then stir at the highest speed for 5 hours to form a slurry.

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Abstract

The invention discloses a preparation method of lithium ion battery slurry. The preparation method comprises the following steps of 1, preparing a glue solution having a concentration of 3 to 7% by an adhesive, 2, putting one or more active substances and one or more conducting additives into a three-arm planetary stirrer, and uniformly mixing the mixture into powder at a low speed, 3, adding 1 to 15% of a solvent into the powder obtained by the step 2, and uniformly mixing the mixture into wet powder at a low speed, wherein a ratio of the total mass of the solvent to the mass of the powder is in a range of (55: 4) to (50: 50), 4, adding 20 to 50% of the glue solution and the rest of the solvent into the wet powder, and uniformly mixing at a high speed, and 5, adding the rest of the glue solution into the mixture obtained by the step 4, uniformly stirring at a low speed for 5 to 10 minutes, and then stirring at a high speed for 2 to 5 hours to obtain the lithium ion battery slurry. The invention also discloses the lithium ion battery slurry and a battery pole piece prepared by the preparation method, and a lithium ion battery.

Description

【Technical field】 [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for preparing lithium-ion battery slurry, the lithium-ion battery slurry prepared by the method, and battery pole pieces and lithium-ion batteries using the lithium-ion battery slurry. 【Background technique】 [0002] In the manufacturing process of lithium-ion batteries, mixing materials is a very important step. The quality of the slurry obtained from mixing materials will directly affect the performance of the finished battery. There are two traditional mixing methods, one is to mix the active material, binder, solvent, conductive agent, etc. according to a certain ratio, and then stir in a mixer at a certain stirring rate to prepare the required slurry; A mixing method is to add active material, binder, solvent, conductive agent, etc. in batches according to a certain proportion and stir during the mixing process to prepare the required slurry. [0003] However...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/13H01M10/0525B01F3/12
CPCY02E60/122Y02E60/10
Inventor 马忠龙
Owner SHENZHEN BAK POWER BATTERY CO LTD
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