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Dry-powder pulping method of lithium-ion battery

A lithium-ion battery, dry powder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cumbersome operation, affecting battery consistency, and high energy consumption, avoiding agglomeration, saving money, and high production efficiency.

Inactive Publication Date: 2015-04-29
SHANDONG QIXING NEW ENERGY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires an additional grinding and pulverizing machine, and the operation is cumbersome and energy-consuming. The grinding and pulverizing process may destroy the original structure of the material and affect the consistency of subsequent batteries.

Method used

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  • Dry-powder pulping method of lithium-ion battery
  • Dry-powder pulping method of lithium-ion battery
  • Dry-powder pulping method of lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of lithium ion battery negative electrode dry powder pulping method, comprises steps as follows:

[0050] 1. Clean up the pulping machine, add the above-mentioned powdery materials into the pulping machine in the order of 1 / 2 active material, conductive agent, thickener, and 1 / 2 active material and stir, active material, conductive agent, thickener The weight ratios of the agent and the binder are respectively: 95.0%, 1.0%, 2.0%, 2.0%; adjust the revolution speed of the pulping machine to be 10r / min, the rotation speed to be 500r / min, and stir for 1h to obtain the mixed powder The active substance is graphite, the conductive agent is carbon black conductive agent (SP), the binder is styrene-butadiene rubber (SBR), the thickener is carboxymethyl cellulose (CMC), and the solvent is deionized water.

[0051] 2. Add the solvent in three times, add the solvent accounting for 70% of the total amount of solvent for the first time, adjust the revolution speed of the pulp...

Embodiment 2

[0063] A method for making slurry of lithium ion battery negative electrode dry powder, as described in Example 1, the difference is:

[0064] Step 2, add the solvent in 4 times, add the solvent accounting for 60% of the total amount of solvent for the first time, adjust the revolution speed of the pulping machine to 40r / min, the rotation speed to 2000r / min, stir for 1h, and control the temperature at 48°C during this process. Obtain viscous slurry;

[0065] Step 3, carry out scraping and bottom turning, scrape off the viscous slurry on the stirring paddle and turn up the slurry at the bottom of the mixing tank, without leaving a dead corner of stirring; after scraping and turning the bottom, add the solvent for the second time The total amount of solvent is 20%, adjust the revolution speed of the pulping machine to 50r / min, the rotation speed to 2500r / min, and stir for 1.5h to further dilute the viscous slurry. The process controls the temperature to 50°C and the vacuum degre...

Embodiment 3

[0069] A method for pulping positive electrode dry powder of lithium-ion batteries, comprising the following steps:

[0070] 1. Clean up the pulping machine, add the above-mentioned powdery materials into the pulping machine according to the feeding order of 1 / 2 active material, conductive agent, binder, and 1 / 2 active material, and stir. Active material, conductive agent, thickener The weight ratios of the agent and the binder added are respectively: 96.0%, 2.0%, and 2.0%; adjust the revolution speed of the pulping machine to be 15r / min, the rotation speed to be 1200r / min, and stir for 0.5h to obtain the mixed powder;

[0071] The active material is lithium cobaltate, the conductive agent is carbon nanotubes (CNTs), the binder is polyvinylidene fluoride (PVDF), and the solvent is N-methylpyrrolidone (NMP).

[0072] 2. Add the solvent accounting for 75% of the total amount of solvent for the first time, adjust the revolution speed of the pulping machine to 15r / min, the rotatio...

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Abstract

The invention relates to a dry-powder pulping method of a lithium-ion battery. The dry-powder pulping method comprises the following steps: mixing materials according to the adding sequence, i.e., active matters, a conductive agent, a bonding agent and / or a thickening agent and active matters; then adding with a solvent by different times to carry out high-speed stirring, the temperature, the revolution speed, the auto-rotational speed and the vacuum degree of the pulping machine are controlled in the process of high-speed stirring, and thus obtaining high-temperature and high-humidity pulp; stirring the high-temperature and high-humidity pulp with reduced speed, cooling, screening by a 80-200-mesh sieve, and discharging, thus preparing pulp for a positive electrode or a negative electrode of the lithium-ion battery. The dry-powder pulping method has the characteristics that the prepared pulp is good in uniformity and stability, the operation is simple and convenient, the fund investment and energy consumption are saved, the pulping period is short, and at least three barrels of pulp are prepared by each piece of equipment every day.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery slurry, in particular to a preparation method of a lithium ion battery positive and negative electrode slurry, and belongs to the technical field of lithium ion battery manufacturing. Background technique [0002] Lithium-ion battery slurry is generally uniformly mixed with electrode active materials, conductive agents, binders, thickeners and other dispersants. It is a solid-liquid two-phase suspension. The lithium-ion battery pulping step is the production of lithium-ion batteries One of the most important links, the quality of the slurry preparation directly affects the performance of the battery. At present, the general lithium-ion battery pulping process in the industry is to dissolve PVDF, CMC, etc. Generally, it takes 1-2 hours, and finally the active substance is added to the pre-made slurry for dispersion, and the process generally takes 6-10 hours. This kind of pulping m...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/36H01M4/62H01M10/0525Y02E60/10
Inventor 周朕良黄磊刘正芳刘亚明张妍李佳郭洪富王克飞方守东郭大利王菲李田田李春祥
Owner SHANDONG QIXING NEW ENERGY SCI & TECH CO LTD
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