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PVDF-coated lithium-ion battery separator and preparation method thereof

A lithium-ion battery and separator technology, applied in battery pack components, circuits, electrical components, etc., can solve problems such as reducing the effective use of space for positive and negative materials in batteries, battery capacity and performance limitations, and affecting battery performance, etc. cracking phenomenon, improve the effective use of space, the effect of low price

Active Publication Date: 2016-05-04
CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing coating technology for PVDF separators of lithium-ion batteries generally adopts an oily coating process. Most of the oily coating processes use acetone as a solvent. The existing problems are: acetone is flammable, explosive, and has great harm to the human body. There are unsafe factors in the production process; at the same time, acetone is the raw material for making methamphetamine, and its use is strictly controlled by relevant departments; It has good compatibility with the diaphragm material, and the slurry will penetrate into the micropores of the base film, resulting in a large loss of air permeability, which will easily cause the diaphragm to block pores, affect the performance of the battery, and reduce the effective use space of the positive and negative materials in the battery, making the battery Capacity and performance are limited

Method used

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  • PVDF-coated lithium-ion battery separator and preparation method thereof
  • PVDF-coated lithium-ion battery separator and preparation method thereof
  • PVDF-coated lithium-ion battery separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Weigh 6.5kg of vinylidene fluoride homopolymer powder, 0.3kg of styrene-butadiene latex, 1kg of triethyl phosphate, 0.2kg of fluoroalkyl methoxy ether alcohol, and 792kg of deionized water; Mix with deionized water, stir for 10 minutes, heat to 50°C to make mixture 1; add vinylidene fluoride homopolymer powder to mixture 1 and grind for 1 hour to obtain mixture 2; add styrene-butadiene latex, fluorinated After stirring the alkyl methoxy ether alcohol evenly, filter it with a 400-mesh stainless steel screen to obtain a PVDF slurry with a viscosity of 3 Pa s; use the gravure coating method to coat the PVDF slurry on a surface with a thickness of 20 μm and pores The coating rate is 20m / min on both sides of a polyethylene-based film with a coating rate of 38%. Three-stage ovens are used for drying, and the temperatures of each oven are 55°C, 70°C, and 60°C. Lithium-ion battery separator, the thickness of the separator is 20.2 μm, and the thickness of each side...

Embodiment 2

[0034] Example 2: Weigh 7.5kg of vinylidene fluoride and hexafluoropropylene copolymer powder, 0.3kg of styrene-acrylic latex, 0.4kg of pure benzene latex, 1.5kg of triethyl phosphate, 0.15kg of polyoxyethylene alkylamide, fatty alcohol poly 0.15 kg of oxyethylene ether, 390 kg of deionized water; mix triethyl phosphate and deionized water, stir for 30 minutes, and heat to 60°C to make mixture 1; add vinylidene fluoride and hexafluoropropylene copolymer to mixture 1 Grind the powder for 2 hours to obtain mixture 2; add styrene-acrylic latex, pure benzene latex, polyoxyethylene alkylamide, fatty alcohol polyoxyethylene ether to the above mixture 2, stir evenly, and filter through a 400-mesh stainless steel screen to obtain PVDF Slurry, the viscosity of the slurry is 10Pa s; the PVDF slurry is coated on one side of the polyvinylidene fluoride base film with a thickness of 30 μm and a porosity of 60% by narrow slot coating method, and the coating speed is 25m / min; use a three-st...

Embodiment 3

[0035] Embodiment 3: Weigh 7kg of vinylidene fluoride homopolymer powder, 0.5kg of polyvinyl acetate, 0.8kg of triethyl phosphate, 0.15kg of fluoroalkyl ethoxy ether alcohol, 500 kilograms of deionized water; Mix ethyl ester with deionized water, stir for 20 minutes, and heat to 70°C to make mixture 1; add vinylidene fluoride homopolymer powder to mixture 1 and grind for 1.5 hours to obtain mixture 2; add polyvinyl acetate to the above mixture 2 , fluoroalkyl methoxy ether alcohol, after stirring evenly, filter with a 400-mesh stainless steel screen to obtain PVDF slurry, the slurry viscosity is 5.6Pa s; use the spray coating method to apply the PVDF slurry on On one side of a polyimide base film with a thickness of 14 μm and a porosity of 55%, the coating rate is 20m / min; three-stage ovens are used for drying, and the temperatures of the ovens at each level are 45°C, 55°C, and 50°C, respectively. After drying, a PVDF-coated lithium-ion battery separator was obtained, the thic...

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Abstract

The invention provides a PVDF-coated lithium-ion battery separator and a preparation method thereof. The PVDF-coated lithium-ion battery separator comprises a base film and a coating, wherein the coating coats a single side or double sides of the base film; the coating is obtained by coating and drying slurry; and the coating is 0.1-0.5 micron in thickness and contains evenly arranged PVDF spherical particles. According to the PVDF-coated lithium-ion battery separator, a traditional technology that an existing PVDF-coated lithium-ion battery separator takes oil substances of acetone and the like as solvents is abandoned. Water is adopted as the solvent of a PVDF material; and no a thickening agent is added, so that the low-viscosity water-based PVDF coating slurry is obtained; an ultra-thin coating of which the PVDF particles are regularly arranged and which is relatively loose is obtained after the slurry is coated; the ultra-thin coating improves the hardness of a pole piece and the effective utilization space of the battery when effectively bonded to the lithium-ion battery separator and the pole piece; and the ventilation loss caused by the thickness of the coating is reduced.

Description

technical field [0001] The invention relates to lithium-ion battery technology, in particular to a PVDF-coated lithium-ion battery diaphragm and a preparation method thereof, belonging to the field of battery technology. 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 affecting the safety performance of the battery, and coating the surface of the separator is an effective method to i...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/426H01M50/443H01M50/491
CPCH01M50/403H01M50/491H01M50/443Y02E60/10
Inventor 赵中雷武跃邵培苓孙卫佳于中彬王庆通庄浩然
Owner CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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