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Diaphragm coat composition, slurry and preparation method thereof, diaphragm and lithium ion battery

A technology of coating composition and diaphragm, which is applied in the direction of secondary batteries, battery pack parts, circuits, etc., can solve the problems of reducing the wetting effect of wetting agents, affecting the permeability of the diaphragm, and not being able to wet, so as to improve the electric current. Core consistency and battery safety, improved battery performance, and low production costs

Inactive Publication Date: 2018-12-21
RUYUAN DONGYANG LIGHT FLUORINE RESIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, in view of the fact that the coating prepared by the existing polymer slurry under conventional coating equipment completely covers the surface of the base film or the ceramic coating, it is easy to cause the pores of the diaphragm to be blocked and affect the gas permeability of the diaphragm. The present invention provides a A membrane coating composition containing a wetting agent and an antifoaming agent, and a polymer slurry is prepared from the composition, the use of the antifoaming agent will reduce the wetting effect of the wetting agent, resulting in the polymer slurry in some areas Unable to wet the surface of the base film or the surface of the ceramic coating, and form a non-full coverage polymer coating after drying, thereby improving the gas permeability of the separator and improving battery performance

Method used

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  • Diaphragm coat composition, slurry and preparation method thereof, diaphragm and lithium ion battery
  • Diaphragm coat composition, slurry and preparation method thereof, diaphragm and lithium ion battery
  • Diaphragm coat composition, slurry and preparation method thereof, diaphragm and lithium ion battery

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preparation example Construction

[0044] The present invention also provides a preparation method of the polymer slurry, comprising the steps of: first adding a dispersant and a wetting agent into a solvent and stirring to obtain a solution; then adding a polymer to the solution and stirring to obtain a polymer predispersion ; continue to add the binder into the polymer pre-dispersion and stir to obtain a polymer dispersion; finally add the defoamer to the polymer dispersion and stir to obtain a polymer slurry.

[0045] According to some embodiments of the present invention, the stirring operation can be performed using any suitable equipment known in the art, and any suitable stirring speed and stirring time can be selected for the purpose of dissolving or uniformly dispersing the substances after mixing. For example, add the dispersant and wetting agent into the solvent, stir at 200-500r / min for 20-50min, then add the polymer into it and continue to stir for 20-50min, and use a high-speed oscillator to vibrat...

Embodiment 1

[0055] ①Add 3g of dispersant (BYK LPC 22136) and 0.3g of wetting agent (BYK LPX 20990) into 100g of deionized water, stir and dissolve at 300r / min for 30min; ②Add 10g of polymer (Kynar Flex 2801) powder into it and continue Stir for 30 minutes, and use a high-speed oscillator to vibrate for 30 minutes to make a polymer pre-dispersion. ③ Add 2 g of binder (aqueous solution of styrene-butadiene rubber) to the polymer pre-dispersion, and stir at 300 r / min for 30 min; ④ Add 0.15 g of defoaming Add the additive (BYK 019) to the polymer dispersion, and stir at 500r / min for 15min to prepare the polymer slurry; ⑤Use an automatic coating machine to coat the polymer slurry on the PE base film; ⑥Use the vacuum at 70℃ After drying in a drying oven for 30 minutes, a polymer-coated diaphragm with dot distribution is prepared, and the average diameter of the dot coating of the diaphragm is about 1 mm.

Embodiment 2

[0057] ① Add 3g of dispersant (BYK LPC 22136) and 0.6g of wetting agent (BYK LPX 20990) into 100g of deionized water, stir and dissolve at 300r / min for 30min; ②Add 10g of polymer (Kynar Flex 2801) powder into it and continue Stir for 30 minutes, and use a high-speed oscillator to vibrate for 30 minutes to make a polymer pre-dispersion ③Add 2g of binder (aqueous solution of styrene-butadiene rubber) to the polymer pre-dispersion, stir at 300r / min for 30 minutes to make a polymer dispersion; ④Add 0.06g of defoamer (BYK 019) into the polymer dispersion, and stir at 500r / min for 15min to prepare a polymer slurry; ⑤Use an automatic coating machine to coat the polymer slurry on the PE base film; ⑥Dry in a vacuum drying oven at 70°C for 30 minutes to prepare a polymer-coated diaphragm with pore-like distribution, and the average diameter of the pores of the polymer coating of the diaphragm is about 1 mm.

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Abstract

A lithium ion battery separator coat composition, slurry and preparation method thereof, separator and lithium ion battery are disclosed. The membrane coating composition comprises, in parts by weight, 8-30 part of polymer, 3-10 part of dispersant, 0.2-1.0 part of wetting agent, 2-6 part of adhesive and 0.05-0.5 part of defoamer. The slurry comprises a diaphragm coating composition and a solvent;A dispersant and a wetting agent are dissolved in a solvent and added with a polymer, and after stirring, a binder and a defoaming agent are sequentially added and stirred to obtain the product. The diaphragm provided by the present invention includes a base film and a polymer coating coated on one or both sides of the base film, the polymer coating being formed by drying the slurry coated on oneor both sides of the base film. A membrane coat composition, a slurry and a preparation method thereof can be used to prepare a high permeability coat membrane without changing existing coating equipment, and when apply to a lithium ion battery, that performance of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery separators, more specifically, to a separator coating composition, a polymer slurry and a preparation method thereof, a high-permeability polymer-coated separator, and a lithium-ion battery containing the separator. Battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long cycle life, no memory effect, safety, reliability, and fast charging and discharging, and have become a research hotspot in new power supply technologies in recent years. The composition of a lithium-ion battery includes a positive electrode, a negative electrode, a separator and an electrolyte. As a barrier between the positive and negative electrodes, the separator plays a vital role in the performance of the lithium-ion battery, and its performance directly affects the capacity and cycle of the battery, especially It is an important factor affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/411H01M50/449
CPCH01M10/0525H01M50/411H01M50/449Y02E60/10
Inventor 李义涛邹智杰程宗盛黄连红张凌飞云晧
Owner RUYUAN DONGYANG LIGHT FLUORINE RESIN CO LTD
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