Positive pole sizing and preparation method and application thereof

A positive electrode slurry and positive electrode technology, which is applied in the field of electrochemical materials, can solve the problems of high cost, long stirring time, and low solid content of slurry, and achieve the effects of reducing dosage, improving baking efficiency, and improving coating efficiency

Active Publication Date: 2017-07-07
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of traditional long stirring time and high cost caused by low solid content of slurry

Method used

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  • Positive pole sizing and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a method for preparing positive electrode slurry (for the process flow chart, see figure 1 ), including the following steps:

[0049] (1) 2g PVDF resin, 3g conductive carbon black and 95g lithium iron phosphate are mixed with the NMP of 21.54g (the NMP used here accounts for 40% of the total NMP) to obtain a premix;

[0050] (2) The premixed material obtained in step (1) was first stirred for 15 minutes under the condition of 15 rpm of revolution and 500 rpm of rotation, and then stirred for 90 minutes for the second time under the condition of 25 rpm of revolution and 1000 rpm of rotation;

[0051] (3) Add the remaining 32.30g of NMP (the NMP used here accounts for 60% of the total NMP), and stir for 60 minutes three times under the conditions of revolution 25rpm and rotation 1200rpm;

[0052] (4) Stir the slurry obtained in step (3) four times for 30 minutes under the condition of only turning on the revolution at 10 rpm and not turning on the ...

Embodiment 2

[0055] This embodiment provides a method for preparing positive electrode slurry, comprising the following steps:

[0056] (1) 3g PVDF resin, 3g conductive carbon black and 94g lithium iron phosphate are mixed with the NMP of 18.85g (the NMP used here accounts for 35% of the total NMP) to obtain a premix;

[0057] (2) The premix obtained in step (1) was first stirred for 15 minutes under the conditions of revolution 12rpm and rotation 550rpm, and then secondly stirred for 90min under the conditions of revolution 28rpm and rotation 1050rpm;

[0058] (3) Add the remaining 35g of NMP (the NMP used here accounts for 65% of the total NMP), and stir three times for 60min under the conditions of revolution 20rpm and autorotation 1250rpm, to obtain positive electrode slurry.

[0059] The positive electrode was prepared by using the positive electrode slurry in this embodiment: the positive electrode slurry was first passed through a 150-mesh sieve, and then coated, and the coating pro...

Embodiment 3

[0061] This embodiment provides a method for preparing positive electrode slurry, comprising the following steps:

[0062] (1) 3g PVDF resin, 2.5g conductive carbon black and 94.5g lithium iron phosphate are mixed with 19.29g of NMP (the NMP used here accounts for 45% of the total NMP) to obtain a premix;

[0063] (2) The premix obtained in step (1) was first stirred for 15 minutes under the conditions of revolution 15rpm and autorotation 600rpm, and then secondly stirred for 90min under the conditions of revolution 30rpm and autorotation 1000rpm;

[0064] (3) Add the remaining 23.57g of NMP (the NMP used here accounts for 55% of the total NMP), and stir for 60 minutes three times under the conditions of revolution 22rpm and rotation 1280rpm;

[0065] (4) Stir the slurry obtained in step (3) four times for 30 minutes under the condition of only turning on the revolution at 10 rpm and not turning on the rotation, to obtain the positive electrode slurry.

[0066] The positive e...

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Abstract

The invention discloses a positive pole sizing and a preparation method and application thereof. The method includes the following steps that firstly, an adhesive, a conductive agent, a positive pole active substance and a part of N-methyl-pyrrolidone (NMP) are mixed to obtain a premix; secondly, the premix obtained in the first step is kneaded and stirred; thirdly, the remaining NMP is added and stirred to obtain the positive pole sizing. By means of the method, the overall stirring and pulping time can be shortened to 165-195 min, the solid content of the obtained positive pole sizing is as high as 56+/-1%, and the cost can be remarkably reduced. When the positive pole sizing is used for preparing negative poles, and the coating production efficiency is increased by 25% and reaches 25-30 m/min.

Description

technical field [0001] The invention relates to the technical field of electrochemical materials, and relates to a slurry, its preparation method and application, and in particular to a positive electrode slurry, its preparation method and its application in lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in portable mobile electronic devices, electric vehicles and energy storage systems due to their advantages such as large specific energy, high working voltage, long cycle life, no memory effect, small self-discharge, no pollution and environmental protection. With the development of lithium-ion batteries, higher requirements are put forward for the consistency and self-discharge rate of batteries, and whether the slurry is uniform and stable directly affects the quality of slurry coating, which in turn affects the consistency and final performance of the battery. The homogenization process of the electrode is mainly related ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 李光龙猛马成勇吕正中
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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