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Lithium ion battery negative paste stabilizer and preparation method and application thereof

A lithium-ion battery, negative electrode slurry technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problem of battery negative electrode slurry stability not mentioned, slurry coating edge bulging, poor rheological stability and other problems, to achieve the effect of inhibiting slurry settlement, preventing bulging and strong stability

Inactive Publication Date: 2019-05-28
福建冠城瑞闽新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the improvement of energy density requirements of lithium-ion batteries, the current secondary granulation technology is more and more applied to negative electrode active materials. Higher, it is easy to have poor rheology or stability, and bad phenomena such as sedimentation or slurry coating edge bulging
[0004] In the publication number CN109273717A, a silicon-based negative electrode modified binder for lithium-ion batteries is disclosed, wherein the binder formula includes polyacrylonitrile, graphene quantum dots, etc., and the polyacrylonitrile used as the silicon-based The purpose of the negative electrode binder is to improve the bonding effect of silicon-based materials, but it does not mention the stability of the battery negative electrode slurry, especially for improving the stability of the secondary granulated negative electrode active material. arrive

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  • Lithium ion battery negative paste stabilizer and preparation method and application thereof

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Embodiment 1

[0040] Embodiment 1: Lithium ion battery negative electrode slurry stabilizer, it comprises the following components: polyacrylonitrile and polar solvent, and described polyacrylonitrile is 0.1%~50% of polar solvent weight.

[0041] Preferably, the polyacrylonitrile is 0.1% by weight of the polar solvent;

[0042] Preferably, the polyacrylonitrile is 50% by weight of the polar solvent;

[0043] Preferably, the polyacrylonitrile is 35% by weight of the polar solvent;

[0044] Preferably, the polyacrylonitrile is 42% by weight of the polar solvent;

[0045] Wherein, the polar solvent is N-methylpyrrolidone;

[0046] Or the polar solvent is ethanol;

[0047] Or the polar solvent is a mixture of N-methylpyrrolidone and ethanol.

[0048] Wherein, the preparation method of the negative electrode slurry stabilizer of the lithium ion battery is: adding polyacrylonitrile powder into a polar solvent, stirring and dispersing the obtained solution, which is the negative electrode slur...

Embodiment 2

[0050] Lithium-ion battery negative electrode slurry, which includes the following components in weight percentage: 0.2% to 2.0% of CMC, 0.5% to 5% of negative electrode conductive agent, 90% to 98% of negative electrode active material, and 0.8% to 2.5% of SBR %, the stabilizer that embodiment 1 makes is 0.2%~5%. Wherein, the negative electrode conductive agent is one or a combination of two or more of acetylene black, carbon nanotubes, and graphene. The negative electrode active material is one or a combination of two or more of secondary granulated artificial graphite, natural graphite, lithium titanate and silicon carbon materials. Preferably, the negative electrode active material is a combination of secondary granulated artificial graphite and natural graphite in a ratio of 1:1.

[0051] Preferably, the components of the lithium-ion battery negative electrode slurry are respectively by weight percentage: 0.2% of CMC, 0.5% of negative electrode conductive agent, 90% of n...

Embodiment 3

[0057] The preparation of negative electrode slurry, its specific steps are:

[0058] S1: Add 1 kg of polyacrylonitrile powder into 99 kg of N-methylpyrrolidone in the first stirring vessel, and stir until uniform to obtain a stabilizer.

[0059] S2: Add 0.16kg CMC and 13.14g deionized water into the second stirring container and stir to prepare CMC glue;

[0060] S3: Add 0.21 kg of negative electrode conductive agent Super P (acetylene black) to the CMC glue, and stir evenly to prepare a conductive glue.

[0061] S4: Add 10kg of artificial graphite with secondary particles into the conductive adhesive solution, and stir evenly to prepare the negative electrode active material solution;

[0062] S5: Add 0.53 kg of SBR to the negative electrode active material liquid, and stir evenly to obtain a semi-finished product;

[0063] S6: Add 5.32 kg of the stabilizer prepared in step S1 to the semi-finished product, stir evenly, and adjust the viscosity of the slurry to 1500-4500 mP...

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Abstract

The invention relates to a lithium ion battery, in particular to a lithium ion battery negative paste stabilizer. The stabilizer includes the following components: polyacrylonitrile and polar solventfor dissolving polyacrylonitrile. The polar solvent is N-methyl pyrrolidone or / and ethanol. Lithium ion battery negative paste includes the following components: CMC, a negative conductive agent, a negative active material, SBR and a stabilizer. The preparation method of the negative paste includes the following steps: stirring CMC and de-ionized water evenly and adding a negative conductive agent; carrying out stirring evenly and adding a negative active material; carrying out stirring evenly and adding SBR; carrying out stirring evenly and adding a stabilizer; and carrying out stirring evenly to obtain negative slurry. When applied to battery negative slurry, the stabilizer of the invention can significantly reduce the TSI of negative slurry, improve the stability of negative slurry, inhibit slurry settling and prevent bad phenomena such as bulging of the coating edge of slurry.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a negative electrode slurry stabilizer for the lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics, new energy vehicles and other fields due to their advantages such as high energy density, long cycle life, green and pollution-free. Negative electrode homogenization is a very important manufacturing process of lithium-ion batteries. Its purpose is to uniformly disperse negative electrode active materials (generally natural graphite, artificial graphite, lithium titanate, silicon carbon materials, etc.), conductive agents, and binders in solvents. Among them, a negative electrode slurry with a certain solid content and viscosity is obtained; among them, the stability of the negative electrode slurry will be directly related to the quality and yield of the subsequent slurry coating. [0003] With the improvement of energy density...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M4/1391H01M4/1393H01M4/1395H01M10/0525
CPCY02E60/10
Inventor 赵家兴王磊张国伟吕娟杨允杰
Owner 福建冠城瑞闽新能源科技有限公司
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