Preparation method of lithium ion battery positive electrode slurry

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problem of large specific surface area of high-performance graphene composite conductive paste, affecting the health of workers in the production workshop, and the toxicity of the production site Large and other problems, to achieve the effect of improving high-power start-up performance, reducing ohmic internal resistance and polarization internal resistance, and good dispersion

Inactive Publication Date: 2021-10-26

湖北中聚能源有限公司

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AI-Extracted Technical Summary

Problems solved by technology

However, NMP is volatile, flammable, explosive, and highly toxic, which can easily cause serious environmental pollution, make the production site highly toxic, and seriously affect the health of the ...

Abstract

The invention discloses a preparation of a lithium ion battery positive electrode slurry. Deionized water is used as a dispersion medium, so that the dispersity of aqueous positive electrode slurry is improved, environmental pollution caused by use of an organic solvent is avoided, and the preparation method is more environment-friendly and safer; in the components of the aqueous positive electrode slurry, the contents of the conductive agent and the aqueous binder are optimized, and meanwhile, the high-performance graphene composite conductive slurry is also used as the conductive agent, so that the ohmic internal resistance and polarization internal resistance of the battery can be reduced, and the high-power starting performance of the lithium battery is improved.

Application Domain

Cell electrodesSecondary cells

Technology Topic

Electrically conductiveOrganosolv +9

Examples

Experimental program(4)

Example Embodiment

[0021] The preparation method of the lithium ion battery positive slurry of the present invention can include the following steps:

[0022] S1, a high-performance graphene composite conductive slurry, aqueous binder, and deionized water are mixed with stirring, resulting in a mixed slurry.

[0023] Among them, aqueous adhesive uses an aqueous adhesive obtained by an acrylonitrile multivalent copolymer, an acrylonitrile multi-docal copolymer therein as a solute, an content of 16% by weight of the total amount of waterborne glue. The conductivity of the deionized water added is ≤ 1 μs / cm, and the amount of deionized water is added such that the solid content of the mixed slurry is 45 to 65 wt%. The stirred glue is 20 to 30 rmp, and the dispersion speed is 2500 ~ 4000 rmp. The stirring time is 60 ~ 120min.

[0024] S2, lithium manganganate and conductive agent were blended and stirred to give a mixed powder. The kneaded stirring is 15 to 30 rmp, the dispersion speed is 1500 ~ 3000 rmp; the stirring time is 180 ~ 240 min.

[0025] S3, mixing the mixed powder and the mixed slurry, stirred at a low speed stirred, and mixture is obtained. Among them, the low speed stirring is 12 to 18 rmp, and the high-speed stirring is 20 to 50 rMP, the dispersion speed is 2000 to 4500 rmp; the stirring time is 60 ~ 150 min.

[0026] S4, the mixture was added to deionized water, stirred at high speed, and the viscosity of 3Pa.s-6Pa.s is obtained.

[0027] In the obtained water-based positive electrode slurry, the acrylonitrile multivision comprises from 1.5% to 3.5% by weight of all solid content.

[0028] The viscosity of the water-based positive electrode slurry of the present invention is 3Pa.s-6Pa.s, and deionized water is added according to the amount of viscosity. The conductivity of deionized water is ≤ 1 μs / cm, and the metal impurities in deionized water cause the battery self-discharge chance.

[0029] In the water-based positive electrode slurry of the present invention, lithium manganate is a positive electrode active material; the conductive agent gives the conductive properties of the water-based positive pole slurry. Alternatively, conductive agents include conductive carbon black, acetylene black, carbon fiber (VGCF), carbon nanotubes (CNTs), one or more of Corin black.

[0030] High performance graphene composite conductive slurry also has a conductive action, which can be filled between the conductive agent in the water system positive electrode slurry, the conductive agent and the lithium manganese acid, eliminate or reduce the conductive agent, the conductive agent The gap between lithium manganganate can reduce the battery ohmic internal resistance and polarization internal resistance, and improve the high power start performance of the battery. Waterborne binders include an acrylonitrile multi-element copolymer.

Example Embodiment

[0032] Example 1

[0033] (1), 1041.6 g of aqueous glue ADY-701A (solid content is 16 wt%), 485g as a solvent, 1587 g high-performance graphene composite conductive paste (solid content is 6.3 wt%), put into Guangzhou Senhong The mixer was stirred at a non-rotational speed of 25 rpm / min, and the dispersion velocity was 2500 rpm / min for 100min; the viscosity was 3500 mPa · s.

[0034] (2), 3000 g of lithium manganate active substance and 66.6 g of conductive agent SP were added to the Guangzhou Senhong mixer, and the discrete rate of 150 rpm / min was stirred at a rate of 150 mPm / min for 180 min.

[0035] (3), then (1) stirred the mixed collant to add (2) to the addition of two phases to carry out the addition and stirring of the two stages: first add (1) the ratio of 20% by weight of the concentration of the concentration of 622.9g, With a non-rotational speed of 15 rpm / min, the dispersion speed of 1500 rpm / min is stirred for a 30 min slurry to achieve a pre-scattered mud-like effect, and then add (1) 80% by weight of the concentration of the concentration to 2491.5g, with a non-rotational speed of 50 rpm / min, dispersion speed 3000 rpm / min was stirred at a high speed of 120min, which was 53.8%.

[0036] (4), taking 485.5 g of water added (3) of the product, at a high speed of 35 rpm / min, the dispersion speed 2500 rpm / min is stirred at high speed for 45min, and the final solid content is 50.4%, the viscosity is 4300 MPa · s water system positive electrode Slurry.

Example Embodiment

[0037] Example 2

[0038] (1), 815.2 gady-701a (solid content of 16 wt%), 385.3 g as a solvent, 1294 g high-performance graphene composite conductive paste (solid content is 6.3 wt%), and put it into the Guangzhou Senhong mixer The non-rotational speed of 25 rpm / min, the dispersion rate of 2500 rpm / min was stirred for 100 min; the viscosity was 3400 mPa · s.

[0039] (2) After adding 3000 g of a lithium manganate active material and 48.9 g of conductive agent SP to the Senhong mixer, it was stirred at a non-rotational speed of 15 rpm / min, and the dispersion rate of 1500 rpm / min was stirred for 180 min.

[0040] (3), add (1) stirred glutinous glutinous powder to carry out the addition and stirring of two stages in the kneaded powder: first addition (1): 20% by weight of the concentration of concentration of 499g, At a rate of 15 rpm / min, the dispersion speed of 1500 rpm / min is stirred for 30 min slurry to achieve a pre-scattered mud-like effect, and then add (1) 80% by weight of the concentration of the concentration of 1995.6g, with a non-rotational speed of 50 rpm / min, dispersion speed 3000rpm / min is stirred at high speed 120min, which has a solid content of 58.8%.

[0041] (4), taking 385.3 g of water added (3) of the product, at a high speed of 35 rpm / min, the dispersion velocity of 2500 rpm / min is stirred at high speed for 45min, and the final solid content is 55.1%, the viscosity is 5300 mPa · s water system positive electrode Slurry.

PUM

Property	Measurement	Unit
Viscosity	3.0 ~ 6.0	Pa·s
Conductivity	<= 1.0	µs/cm
Viscosity	3.0 ~ 6.0	pa·s

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

avoid environmental pollution
Improve dispersion

Preparation method of lithium ion battery positive electrode slurry

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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