Preparation method for lithium-ion button cell

A button battery and lithium-ion technology, which is applied in the field of lithium-ion button battery preparation, can solve problems such as inappropriateness, complicated process, and long mixing time, so as to improve performance, improve mixing uniformity and dispersibility, and improve efficiency Effect

Inactive Publication Date: 2016-10-26
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of step-by-step feeding are also obvious, that is, the slurry mixing time is longer, at least 7 hours or more; and the process steps are many and the process is complicated, which is very inappropriate for the preparation of small batches of slurry, which is not conducive to the rapid preparation of small batches. The experimental slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 400g of graphite, 6.4g of carbon black, and 6.4g of carboxymethyl cellulose powder, add in the homogenization tank, and add an appropriate amount of water to make the solid content 50wt%, cover the lid; put the homogenization tank into the instrument In the middle, turn on the instrument to make the tank body self-propagate and revolve at the same time, the rotation speed is 600rpm / min, rotate for 2min, so that the solid and liquid are fully infiltrated; increase the rotation speed to 2500rpm / min, rotate for 3min, put the jar in ice water to cool to room temperature, and get Uniformly mixed viscous slurry; add a commercial SBR aqueous solution with a solid content of 50wt%, and then add an appropriate amount of water to make the solid content 35wt%, and continue to disperse at 600rpm / min for 1min to obtain a fluid uniform Dispersed slurry.

[0032] The resulting slurry was subjected to a fineness test, and the result was 24 μm. Afterwards, the slurry is evenly co...

Embodiment 2

[0034] Weigh graphite 400g, carbon nanotube 6.4g, epoxy resin 6.4g, add in the homogenizer tank, and add appropriate amount of water, make its solid content be 70wt%, cover lid; The homogenizer tank is put into the instrument, Turn on the instrument to make the tank self-propagating and revolving at the same time. The rotation speed is 1300rpm / min, rotate for 5min, so that the solid and liquid are fully infiltrated; increase the rotation speed to 3500rpm / min, rotate for 10min, put the jar in ice water to cool to room temperature, and get a uniform mixture Viscous slurry; then add an appropriate amount of acetone to make the solid content to 55wt%, and continue to disperse at 2500rpm / min for 3 minutes to obtain a fluid and evenly dispersed slurry.

[0035] The resulting slurry was subjected to a fineness test, and the result was 24 μm. Afterwards, the slurry is evenly coated on the copper foil, dried after coating, and the dried pole pieces are put into rolling rollers for roll...

Embodiment 3

[0037] Weigh 520g of nickel-cobalt-lithium-manganese-oxide powder, 11g of vapor-deposited carbon fiber, g of graphene, and 16.8g of polyvinylidene fluoride powder, add them to the homogenizer tank, and add an appropriate amount of NMP to make the solid content 45wt%, and cover the lid ;Put the homogenizer tank into the instrument, turn on the instrument to make the tank body self-transfer and revolve at the same time, the speed is 500pm / min, rotate for 1min, so that the solid and liquid are fully infiltrated; increase the speed to 2500rpm / min, rotate for 2min, put the jar Pour into ice water and cool to room temperature to obtain a uniformly mixed viscous slurry; then add an appropriate amount of NMP to make the solid content 30wt%, and continue to disperse at 500rpm / min for 1min to obtain a fluid and uniformly dispersed slurry .

[0038] A fineness test was carried out on the obtained slurry, and the result was 20 μm. Afterwards, the slurry is evenly coated on the aluminum f...

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PUM

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Abstract

The invention discloses a preparation method for a lithium-ion button cell. The preparation method comprises the following steps: preparation of positive and negative electrode slurry; coating of the slurry for preparation of pole pieces; cutting of the pole pieces; assembling of the cell; etc. The preparation of the slurry is realized through simultaneous addition of raw materials and step-by-step rotation and homogenization, and the process of rotation and homogenization is divided into three stages, i.e., low-speed rotation and homogenization, high-speed rotation and homogenization and medium-speed rotation and homogenization. According to the invention, in virtue of high-speed revolution and rotation of a container, high-speed collision and shearing occur among solid particles and between the particles and the container, all the solid particles are not aggregated any longer and are uniformly dispersed in a solvent; homogenization efficiency is improved, and manufacturing of a great number of button cells can be completed in one day, so research and development efficiency is improved and button cell manufacturing efficiency is enhanced; and the quality of the button cell is improved by improving uniformity and dispersibility of the slurry in mixing, so the battery can better reflect material performance and performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of manufacturing lithium ion batteries, in particular to a method for preparing lithium ion button batteries. Background technique [0002] Lithium-ion batteries have attracted great attention because of their excellent characteristics such as high energy density, high output voltage, low self-discharge rate, long service life, no memory effect, and environmental friendliness. After more than 20 years of development, the performance of lithium batteries has been greatly improved in all aspects, which is due to the theoretical research on lithium battery systems. In addition, both material manufacturers and battery manufacturers need to conduct performance evaluation and development of lithium battery positive and negative electrode materials, diaphragm electrolyte, etc. Fast and efficient evaluation can be achieved by making and testing coin cells. Button lithium-ion batteries are also widely used in electrical appl...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M4/04H01M10/0525
CPCH01M4/04H01M10/04H01M10/0525Y02E60/10Y02P70/50
Inventor 刘学文
Owner WANXIANG 123 CO LTD
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