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Aqueous positive electrode slurry and preparation method thereof

A technology of positive electrode slurry and positive electrode material, applied in the field of electrochemistry, can solve problems such as pollution of positive electrode oily slurry, and achieve the effects of reducing coating drying temperature, energy consumption and production cost.

Pending Publication Date: 2022-07-08
珠海汉格能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a water-based positive electrode slurry and a preparation method thereof, and the positive electrode water-based slurry prepared by replacing PVDF with a water-based binder and deionized water instead of NMP solves the pollution problem caused by the preparation process of the positive electrode oily slurry, and The cycle, rate and safety performance of lithium-ion batteries prepared using this slurry all meet commercial needs

Method used

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  • Aqueous positive electrode slurry and preparation method thereof
  • Aqueous positive electrode slurry and preparation method thereof
  • Aqueous positive electrode slurry and preparation method thereof

Examples

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Embodiment 1

[0028] A method for preparing an aqueous positive electrode slurry of this embodiment includes the following steps:

[0029] (1), by mass percentage, mix 0.1% polystyrene-acrylate LB300 water-based adhesive, 1.5% sodium carboxymethyl cellulose CMC and part of deionized water, stir at low speed for 5min first, and the rotating speed is: The revolution is 10r / min, the rotation is 50r / min; then, the high-speed stirring is 30min, the rotation speed is: the revolution is 10r / min, the rotation is 200r / min, and the first glue is formed;

[0030] (2), in the first glue solution, add 1% conductive agent by mass percentage, stir at a high speed for 30min, the rotating speed is: revolution is 10r / min, rotation is 1000r / min, form the second glue solution, this embodiment The conductive agent is conductive graphite;

[0031] (3), in the second glue solution, add 97.1.% of the lithium ion battery positive electrode material using lithium cobalt oxide by mass percentage, stir at a low speed...

Embodiment 2

[0035] A method for preparing an aqueous positive electrode slurry of this embodiment includes the following steps:

[0036] (1), by mass percentage, mix 2% of polystyrene-acrylate LB300 water-based adhesive, 2% of sodium carboxymethyl cellulose CMC and part of deionized water, stir at low speed for 10min first, and the rotating speed is: The revolution is 15r / min, the rotation is 150r / min; then, the high-speed stirring is 50min, and the rotation speed is: the revolution is 25r / min, the rotation is 220r / min, and the first glue is formed;

[0037] (2), in the first glue solution, add 2% conductive agent by mass percentage, stir at a high speed for 50min, the rotating speed is: revolution is 25r / min, rotation is 1200r / min, form the second glue solution, this embodiment The conductive agent is conductive graphite;

[0038] (3), in the second glue solution, add 97.1.% lithium ion battery positive electrode material using lithium cobalt oxide by mass percentage, stir at low speed ...

Embodiment 3

[0042] A method for preparing an aqueous positive electrode slurry of this embodiment includes the following steps:

[0043](1), by mass percentage, mix 3% polystyrene-acrylate LB300 water-based adhesive, 2.5% sodium carboxymethyl cellulose CMC and part of deionized water, stir at low speed for 10min first, and the rotating speed is: The revolution is 25r / min, the rotation is 200r / min; then, the high-speed stirring is 50min, and the rotation speed is: the revolution is 30r / min, the rotation is 250r / min, and the first glue is formed;

[0044] (2), in the first glue solution, add 2.0% conductive agent by mass percentage, stir at a high speed for 50min, the rotating speed is: revolution is 30r / min, rotation is 1500r / min, form the second glue solution, this embodiment The conductive agent is conductive graphite;

[0045] (3), in the second glue solution, add 97.1.% lithium ion battery positive electrode material using lithium cobalt oxide by mass percentage, stir at low speed for...

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Abstract

The preparation method comprises the following steps: mixing 0.1-3.0% by mass of a polystyrene-acrylate LB300 water-based adhesive, 0.5-2.5% by mass of a water-based thickening agent and part of deionized water, stirring at a low speed, and then stirring at a high speed to form a first glue solution; adding 0.1-2.0% of a conductive agent into the first glue solution, and stirring at a high speed to form a second glue solution; adding 97.1% of a lithium ion battery positive electrode material adopting lithium cobalt oxide into the second glue solution, and stirring at a low speed to obtain a third glue solution; deionized water accounting for 100-150% of the mass of the lithium cobalt oxide lithium ion battery positive electrode material is added into the third glue solution for viscosity regulation, and the slurry is vacuumized after being stirred at a low speed; and (4) carrying out defoaming treatment on the slurry obtained in the step (4), directly filling air to unload vacuum, and slowly stirring the slurry to obtain the water-based positive electrode slurry. The process can effectively reduce the production cost, has no pollution to the atmosphere, and effectively ensures the health and safety of production personnel.

Description

【Technical field】 [0001] The invention relates to the technical field of electrochemistry, in particular to an aqueous positive electrode slurry and a preparation method thereof. 【Background technique】 [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have the advantages of higher energy density, low self-discharge, and long cycle life. They have been widely used in consumer electronics and power batteries. The preparation of lithium-ion batteries requires an auxiliary material binder, which is also an important factor affecting the composition of the battery and its comprehensive performance. [0003] At present, the positive electrode slurry of lithium ion battery, especially the positive electrode plate of lithium ion battery produced by electronic cigarette manufacturers, generally uses fluorine-containing polymer such as PVDF (polyvinylidene fluoride) as a binder and a strong polar organic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M4/1391
CPCH01M4/525H01M4/131H01M4/1391Y02E60/10
Inventor 胡常青赵明罗强
Owner 珠海汉格能源科技有限公司
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