Power battery oil-based negative electrode slurry and preparation method thereof

A negative electrode slurry and power battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrode sheet quality degradation, difficult to remove air bubbles, etc., and achieve shortened stirring time, reduced batching time, and uniform thickness Effect

Inactive Publication Date: 2019-06-14
JIANGSU TAFEL NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide an oil-based negative electrode slurry for power batteries in view of the deficiencies in the prior art, so as to solve the problem of stirring the viscous slurry at high speed after the oily adhesive system is added in the preparation of the existing slurry When a large number of bubbles are generated, it is difficult to remove, which leads to the deterioration of the electrode sheet quality and affects the electrochemical performance.

Method used

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  • Power battery oil-based negative electrode slurry and preparation method thereof

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Effect test

Embodiment 1

[0035] A power battery oil-based negative electrode slurry, comprising the following components by mass: 93 parts of negative electrode active materials, 1.5 parts of binder, 1 part of conductive agent, 0.05 parts of defoaming agent and 70 parts of solvent; Vinyl fluoride; the solvent is N-methylpyrrolidone; the solid content of the slurry is 50%; the viscosity of the slurry is 3000mPa.s; the negative electrode active material is natural graphite; ~10μm, D90 is 10~20μm; conductive agent is acetylene black; defoamer is ethylene carbonate.

[0036] The preparation method of the above-mentioned power battery oil-based negative electrode slurry is as follows:

[0037] S1, add all the negative electrode active material, binder, conductive agent and defoamer into the container according to the mass ratio and stir for premixing, the stirring speed is 20r / min, the rotation is 0, and the stirring time is 15min;

[0038] S2, add 80% solvent, first stir 5min at a stirring speed of 40r / m...

Embodiment 2

[0041]A power battery oil-based negative electrode slurry, comprising the following composition in parts by mass: 93.5 parts of negative electrode active material, 2 parts of binder, 1.2 parts of conductive agent, 0.08 parts of defoaming agent and 75 parts of solvent; Vinyl fluoride; the solvent is N-methylpyrrolidone; the solid content of the slurry is 54%; the viscosity of the slurry is 3500mPa.s; the negative electrode active material is artificial graphite; ~10μm, D90 is 10~20μm; conductive agent is conductive carbon black; defoamer is propylene carbonate.

[0042] The preparation method of the above-mentioned power battery oil-based negative electrode slurry is as follows:

[0043] S1, according to the mass ratio, add all the negative electrode active material, binder, conductive agent and defoamer into the container and stir for premixing. The stirring speed is 25r / min, the rotation is 0, and the stirring time is 10min;

[0044] S2, add 60% solvent, first stir for 3min ...

Embodiment 3

[0047] A power battery oil-based negative electrode slurry, comprising the following composition in parts by mass: 94 parts of negative electrode active materials, 2 parts of binder, 1.5 parts of conductive agent, 0.05 parts of defoaming agent and 80 parts of solvent; Vinyl fluoride; the solvent is N-methylpyrrolidone; the solid content of the slurry is 55%; the viscosity of the slurry is 4000mPa.s; the negative active material is mesophase carbon microspheres; the conductive agent is single-wall carbon nanotubes; defoaming The solvent is isopropanol.

[0048] The preparation method of the above-mentioned power battery oil-based negative electrode slurry is as follows:

[0049] S1, add all the negative electrode active material, binder, conductive agent and defoamer into the container according to the mass ratio and stir for premixing, the stirring speed is 30r / min, the rotation is 0, and the stirring time is 20min;

[0050] S2, add 80% solvent, first stir for 4min at a stirr...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to power battery oil-based negative electrode slurry. The slurry comprises the following components in parts by mass: 93 to 96.5 parts of a negative active substance, 1.5 to 4.5 parts of a binder, 1 to 2 parts of a conductive agent, 0.05 to 1 part of a defoaming agent and 70 to 100 parts of a solvent, wherein the binder is polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone. Compared with the prior art, the scheme of the invention solves the problem that in the preparation of the existing slurry, alarge amount of bubbles are generated when the viscous slurry is stirred at high speed after an oily bonding system is added, the large amount of bubbles are difficult to be removed, the decrease inthe quality of electrode sheets is further caused, and the electrochemical performance is affected. In addition, the invention also provides a preparation method of the power battery oil-based negative electrode slurry, which reduces the batching time, improves the stirring process, increases the production efficiency, and reduces the energy consumption.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a power battery oil-based negative electrode slurry and a preparation method thereof. Background technique [0002] Lithium-ion batteries have experienced vigorous development in recent years due to their high energy density, high working voltage, stable cycle performance, good load characteristics, fast charge and discharge rate, safety and non-pollution, and are widely used in pure Various fields such as electric vehicles and portable electronic devices. [0003] Lithium-ion batteries mainly include the following components: positive electrode, negative electrode, separator, electrolyte, current collector, and packaging shell, etc. Among them, the negative electrode is an important factor to improve the cycle life and reversible capacity, and it is particularly important to reduce the internal resistance of the negative electrode sheet . In addition, a good form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/587H01M10/0525
CPCY02E60/10
Inventor 林沃荣
Owner JIANGSU TAFEL NEW ENERGY TECH CO LTD
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