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Preparation method for aqueous anode slurry containing VGCF (vapor-grown carbon nanoflbers) of lithium ion battery

A lithium-ion battery, cathode slurry technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of easy agglomeration during solvent dispersion, large specific surface of VGCF, and uniform dispersion of various components. Good performance, low cost, and the effect of improving processing performance

Inactive Publication Date: 2018-11-30
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, VGCF has a large specific surface area and is easy to agglomerate. It is not easy to disperse evenly in solvents only by traditional mechanical stirring. At the same time, most solvents on the market use NMP, which is harmful to the human body and pollutes the environment.
[0005] The existing slurry preparation technology for lithium-ion batteries relies on simple mechanical stirring, which is difficult to disperse various components evenly, especially VGCF, which has a large specific surface and is easy to agglomerate during the solvent dispersion process, especially in water systems. More difficult to disperse in solvents

Method used

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  • Preparation method for aqueous anode slurry containing VGCF (vapor-grown carbon nanoflbers) of lithium ion battery
  • Preparation method for aqueous anode slurry containing VGCF (vapor-grown carbon nanoflbers) of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0023] 1. First, mix 1228g LA132 (solid content is 15wt%) and 724g water as a solvent, put it into a double-star mixer and stir for 15min at a revolution speed of 20rpm / min and a dispersion speed of 3000rpm / min; measure its viscosity to be 3100mPa·s.

[0024] 2. Next, add 26.3g SP into the above solution; then stir for 50min at a revolution speed of 10rpm / min and a dispersion speed of 1000rpm / min; measure its fineness to be less than 15μm. After the fineness is lower than 15 μm, add 877.2g VGCF composite slurry (solid content is 6wt%) into the above mixed solution, and then stir at a high speed of 40rpm / min at a revolution speed of 4500rpm / min for 100min; The content is 67%.

[0025] 3. Then add 5000g of lithium iron phosphate powder into the above solution for two-stage stirring; first stir at a revolution speed of 10rpm / min and a dispersion speed of 1000rpm / min for 10min to achieve the effect of infiltration, and then at a revolution speed of 40rpm / min, disperse Stir at a s...

Embodiment 2

[0028] 1. First, mix 1430g LA132 and 576g water as a solvent, put it into a double star mixer and stir for 15min at a revolution speed of 20rpm / min and a dispersion speed of 3000rpm / min; the viscosity is measured to be 3100mPa·s.

[0029] 2. Next, add 80g of SP into the above solution; stir for 50min at a revolution speed of 10rpm / min and a dispersion speed of 1000rpm / min; measure its fineness to be less than 15μm. Add 1166.6g of VGCF composite slurry (6wt% solid content) into the above mixed solution, and then stir at high speed for 100min at a revolution speed of 40rpm / min and a dispersion speed of 4500rpm / min; the solid content of this stage is 65%.

[0030] 3. Then add 5000g of lithium iron phosphate powder into the above solution for two-stage stirring; first stir at a revolution speed of 10rpm / min and a dispersion speed of 1000rpm / min for 10min to achieve the effect of infiltration, and then at a revolution speed of 40rpm / min, disperse Stir at a speed of 4500rpm / min for ...

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Abstract

The invention relates to the technical field of lithium ion batteries, and particularly relates to a preparation method for aqueous anode slurry containing VGCF (vapor-grown carbon nanoflbers) of a lithium ion battery. The preparation method comprises the following steps of (1) mixing water-based glue and deionized water, and carrying out gluing; (2) adding conductive carbon black SP into a glue-water mixed solution obtained in the step (1), carrying out infiltration stirring, after carrying out stirring for a period of time, adding a VGCF (vapor-grown carbon nanoflbers) composite slurry body,and carrying out mixing and stirring; (3) adding lithium iron phosphate powder into the slurry body subjected to infiltration stirring, and carrying out stirring at a high speed; and (4) continuouslyadding deionized water, and after carrying out stirring at a high speed, adjusting the viscosity of the slurry body to be 2000-4000 mPa.s. The preparation method has the advantages that a solvent isthe deionized water, the cost is low, the environment is protected; wet-process stirring is adopted, the disperstiveness of the slurry is good, the conductivity of the slurry is improved, the internalresistance of the battery is further reduced, the rate performance is improved, in addition, compared with dry-process stirring, wet-process stirring has the advantage that the viscosity of the slurry is lower under the condition that the solid content is the same, and therefore the processing performance of the slurry is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a VGCF-containing lithium-ion battery aqueous cathode slurry. Background technique [0002] During the charge-discharge cycle of a lithium-ion battery, when the positive and negative electrodes pass current, the electrode potential will deviate from the equilibrium potential to generate polarization. If the polarization phenomenon is not improved for a long time, the precipitation of lithium metal at the negative electrode will be accelerated, and in the long run, the separator will be pierced and the battery will be short-circuited, causing safety problems. How to improve the conductivity of lithium batteries through design has become a topic that needs attention. However, relying solely on the conductivity of the active material cannot meet the requirements of the electron transfer rate, so the addition of a conductive agent is required. ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/1397H01M10/0525
CPCH01M4/04H01M4/1397H01M10/0525Y02E60/10
Inventor 张丽武玉哲刘欣刘琦徐佳
Owner HEFEI HENGNENG NEW ENERGY TECH
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