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Preparation method of lithium battery negative electrode slurry

A negative electrode slurry, lithium battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as affecting lithium ion movement, affecting particle dispersion and uniformity, etc., to save production costs and achieve excellent discharge performance. , good dispersion effect

Inactive Publication Date: 2017-10-10
SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, in this process, changes in temperature, viscosity, environment, etc. will affect the dispersion and uniformity of particles in the positive and negative electrode slurry, and then affect the movement of lithium ions between the two electrodes of the battery.

Method used

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  • Preparation method of lithium battery negative electrode slurry
  • Preparation method of lithium battery negative electrode slurry
  • Preparation method of lithium battery negative electrode slurry

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preparation example Construction

[0026] Please refer to figure 1 , The present invention provides a method for preparing a lithium battery negative electrode slurry, which includes the following steps:

[0027] Step 1: First weigh the graphite, conductive agent and sodium carboxymethyl cellulose dry powder with a mass ratio of 93-96:2-5:1.8-2.5, and then combine the graphite, conductive agent and 30%-70% of carboxymethyl The sodium base cellulose powder is added to the mixing tank, and the rotation and revolution of the mixing tank are turned on for the first mixing;

[0028] Step 2: Add part of 20%-60% deionized water in deionized water with a solid content of 45%-50% for a second stirring;

[0029] Step 3: Add the remaining 70%-30% of the dry powder of sodium carboxymethyl cellulose for the third time;

[0030] Step 4: Add the remaining 80%-40% deionized water and stir for the fourth time;

[0031] Step 5: Adjust the rotation of the mixing tank for the fifth time, and connect the circulating cooling water;

[0032] S...

Embodiment

[0043] Step 1: First weigh the graphite, conductive agent and sodium carboxymethylcellulose dry powder with a mass ratio of 96:2:2, and then add graphite, conductive agent and 30% part of the dry sodium carboxymethylcellulose powder into the mixing tank , Turn on the rotation and revolution of the mixing tank and perform the first stirring for 20 minutes, where the frequency of rotation is: 5Hz; the frequency of revolution is: 15Hz.

[0044] Step 2: Add 20% part of deionized water in deionized water with a solid content of 45%, and stir for a second time for 60 minutes.

[0045] Step 3: Add the remaining 70% part of the sodium carboxymethyl cellulose dry powder and stir for the third time for 5 minutes;

[0046] Step 4: Add the remaining 80% deionized water and stir for the fourth time for 5 minutes;

[0047] Step 5: Adjust the rotation of the stirring tank for the fifth time of stirring for 60 minutes, and turn on the circulating cooling water. The frequency of the rotation is: 25 Hz...

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Abstract

The invention discloses a preparation method of lithium battery negative electrode slurry. The preparation method comprises the following steps: step one, weighing graphite, a conductive agent and sodium carboxymethylcellulose dry powder in a mass ratio of (93 to 96): (2 to 5): (1.8 to 2.5), then adding the graphite, the conductive agent and partial sodium carboxymethylcellulose dry powder with the solid content of 30% to 70% into a stirring tank, and starting roatation and revolution of the stirring tank for first stirring; step two, adding partial deionized water with the solid content of 20% to 60% in deionized water with the solid content of 45% to 50% for second stirring; step three, adding remaining partial sodium carboxymethylcellulose dry powder with the solid content of 70% to 30% for third stirring; step four, adding remaining partial deionized water with the solid content of 80% to 40% for fourth stirring; step five, adjusting the rotation of the stirring tank for fifth stirring, and connecting circulating cooling water; step six, adding a negative electrode adhesive, and then adjusting the rotation of the stirring tank again for sixth stirring; and step seven, stopping the rotation of the stirring tank, then adjusting the revolution of the stirring tank for seventh stirring to obtain a product, and carrying out vacuum defoamation on the product.

Description

【Technical Field】 [0001] The invention relates to the technical field of battery negative electrode materials, in particular to a method for preparing lithium battery negative electrode slurry. 【Background technique】 [0002] The slurry mixing and dispersion process of lithium batteries has a great impact on the entire production process of lithium batteries, and is the most important link in the entire production process. The positive electrode slurry of lithium battery is composed of binder, conductive agent, positive electrode material, etc.; the negative electrode slurry is composed of binder, graphite carbon powder, etc. The preparation of positive and negative slurry includes a series of processes such as the mutual mixing, dissolution and dispersion of liquid and liquid, and liquid and solid materials. In addition, changes in temperature, viscosity, and environment will affect the dispersion and uniformity of the particles in the positive and negative slurry during this p...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/1393H01M4/62H01M10/0525H01M4/583
CPCH01M4/04H01M4/1393H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张国恒朱丹容亮斌许辉饶睦敏
Owner SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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