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Preparation method of lithium ion power battery cathode

A power battery and lithium-ion technology, which is applied in the field of negative electrode preparation of lithium-ion power batteries, can solve problems such as bubble stirring time, achieve good wettability and fluidity, improve wetting coating performance, and good consistency.

Active Publication Date: 2017-06-13
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of air bubbles and stirring time in the negative electrode slurry coating process, the present invention provides a new negative electrode dry preparation process

Method used

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  • Preparation method of lithium ion power battery cathode
  • Preparation method of lithium ion power battery cathode
  • Preparation method of lithium ion power battery cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Glue making. First add a certain amount of deionized water into the No. 1 mixer, and then evenly add a certain amount of CMC powder, so that the concentration of the CMC glue is 2.3%. Stir for 5 minutes at a revolution speed of 43 rpm; then stir for 10 minutes at a revolution speed of 20 rpm and a dispersion speed of 1800 rpm; then stir for 120 minutes at a revolution speed of 15 rpm and a dispersion speed of 3000 rpm.

[0041] 2. Leave it on hold for 120 minutes, and vacuumize the No. 1 mixer to -0.1Mpa.

[0042] 3. Add graphite and sp powder to No. 2 blender, and dry mix. Stir for 25 minutes at a revolution speed of 20 rpm and a dispersion speed of 1200 rpm.

[0043] 4. Add the CMC glue prepared by No. 1 mixer to No. 2 mixer, stir for 3 minutes at a revolution speed of 10 rpm, a dispersion speed of 500 rpm, and scrape the barrel once; continue stirring, and stir for 30 minutes at a revolution speed of 30 rpm and a dispersion speed of 1500 rpm, every 10 Scrape th...

Embodiment 2

[0052]1. Glue making. First add a certain amount of deionized water into the No. 1 mixer, and then evenly add a certain amount of CMC powder, so that the concentration of the CMC glue is 2.5%. Stir at a revolution speed of 38rpm for 3 minutes; then stir at a revolution speed of 18rpm and a dispersion speed of 1500rpm for 5 minutes; then stir at a revolution speed of 18rpm and a dispersion speed of 2500rpm for 100 minutes.

[0053] 2. Leave it aside for 100 minutes, and vacuumize the No. 1 mixer to -0.15Mpa.

[0054] 3. Add graphite and sp powder to No. 2 blender, and dry mix. Stir for 20 minutes at a revolution speed of 25 rpm and a dispersion speed of 1000 rpm.

[0055] 4. Add the CMC glue prepared by No. 1 mixer to No. 2 mixer, stir for 4 minutes at a revolution speed of 12rpm, a dispersion speed of 300rpm, and scrape the bucket once; continue to stir, stir for 35 minutes at a revolution speed of 25rpm, and a dispersion speed of 1800rpm, every 10 Scrape the bucket every m...

Embodiment 3

[0063] 1. Glue making. First add a certain amount of deionized water into No. 1 mixer, and then evenly add a certain amount of CMC powder to make the concentration of the CMC glue solution 2.9%. Stir at a revolution speed of 45 rpm for 10 minutes; then stir at a revolution speed of 25 rpm and a dispersion speed of 2000 rpm for 8 minutes; then stir at a revolution speed of 20 rpm and a dispersion speed of 3500 rpm for 150 minutes.

[0064] 2. Leave it on hold for 110 minutes, and vacuumize the No. 1 mixer to -0.2Mpa.

[0065] 3. Add graphite and sp powder to No. 2 blender, and dry mix. Stir for 30 minutes at a revolution speed of 28 rpm and a dispersion speed of 1500 rpm.

[0066] 4. Add the CMC glue prepared by No. 1 mixer to No. 2 mixer, stir for 5 minutes at a revolution speed of 15rpm, and a dispersion speed of 600rpm, and scrape the bucket once; continue stirring, and stir for 40 minutes at a revolution speed of 28rpm, and a dispersion speed of 2000rpm, every 10 Scrape ...

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Abstract

The invention relates to the field of power lithium ion batteries, in particular to a preparation method of a lithium ion power battery cathode. The preparation method comprises the following steps: first preparing sodium carboxymethylcellulose glue solution in a number 1 stirring machine, adding conducting carbon black and dry graphite powder in a number 2 stirring machine, uniformly mixing, and then adding the sodium carboxymethylcellulose glue solution in the number 1 stirring machine into the number 2 stirring machine; and adding little alcohol, vacuumizing, defoaming, adding styrene-butadiene latex, mixing, finally vacuum defoaming, and obtaining the lithium ion power battery cathode material. By improving a stirring scheme, the stirring time of the cathode slurry is shortened, the moisturizing coating performance of the cathode slurry is improved, and a bubble-free purpose is achieved.

Description

technical field [0001] The invention relates to the field of power lithium-ion batteries, in particular to a method for preparing a negative electrode of a lithium-ion power battery. Background technique [0002] Lithium battery is a green, high-energy and environment-friendly battery that appeared in the 1990s. It has the advantages of high working voltage, high specific energy, long cycle life, no memory effect, fast charging and no environmental pollution. It is the engine that opens a new era of automotive energy. However, with the increasing shortage of global energy and the continuous deterioration of the natural environment, whether to develop new high-performance electric vehicles as soon as possible has become one of the most concerned topics. At present, the four parts of the positive electrode material, negative electrode material, electrolyte, and diaphragm in lithium-ion batteries account for 85% of the cost of lithium-ion batteries, and the negative electrode m...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/04
CPCH01M4/04H01M4/0404H01M4/1393Y02E60/10
Inventor 周皖岳林彭桃君吴树森武玉哲白思宇丁蒙蒙
Owner HEFEI HENGNENG NEW ENERGY TECH
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