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Aramid fiber coating liquid and lithium-ion battery separator and preparation methods thereof

A lithium-ion battery and coating liquid technology, applied in secondary batteries, battery pack parts, coatings, etc., can solve problems such as poor thermal stability, improve bonding performance, high extraction efficiency, improve energy density and Effects of oxidation resistance and thermal stability

Active Publication Date: 2019-01-11
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second object of the present invention is to provide a lithium-ion battery diaphragm and a preparation method thereof, aiming at solving the problem of poor thermal stability of the diaphragm in the prior art

Method used

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  • Aramid fiber coating liquid and lithium-ion battery separator and preparation methods thereof
  • Aramid fiber coating liquid and lithium-ion battery separator and preparation methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment provides a kind of aramid fiber coating solution for preparing coated diaphragm, which comprises by weight parts:

[0041] 8 parts of aramid fiber, 5 parts of polyvinylidene fluoride, 10 parts of inorganic filler, 10 parts of dimethyl carbonate, 115 parts of dimethylacetamide.

[0042] Its preparation method includes:

[0043] a. polyvinylidene fluoride is mixed with 50 parts of dimethylacetamide to obtain a tackifier;

[0044] b. mixing the inorganic filler with 30 parts of dimethylacetamide to prepare the inorganic filler slurry;

[0045] c. Disperse aramid fiber in 35 parts of dimethylformamide, stir for 0.5h, then add dimethyl carbonate, stir at 1300rmp for 0.5h, mix well with tackifier and inorganic filler slurry Stir for 2h, that is.

Embodiment 2

[0047] This embodiment provides a kind of aramid fiber coating solution for preparing coated diaphragm, which comprises by weight parts:

[0048] 3 parts of aramid fiber, 1 part of polyvinylidene fluoride, 20 parts of inorganic filler, 4 parts of dimethyl carbonate, 50 parts of N-methylpyrrolidone, 15 parts of isopropanol.

[0049] Its preparation method includes:

[0050] a. mixing polyvinylidene fluoride with 20 parts of N-methylpyrrolidone to obtain a tackifier;

[0051] b. mixing the inorganic filler with isopropanol to prepare the inorganic filler slurry;

[0052] c. Disperse the aramid fiber in 30 parts of N-methylpyrrolidone, stir for 0.5h, then add dimethyl carbonate, stir at 700rmp for 1h, stir well, mix with tackifier and inorganic filler slurry and stir 1h, that is.

Embodiment 3

[0054] This embodiment provides a kind of aramid fiber coating solution for preparing coated diaphragm, which comprises by weight parts:

[0055] 5 parts of aramid fiber, 2.5 parts of polytetrafluoroethylene, 15 parts of boehmite, 6.5 parts of dimethyl carbonate, 35 parts of dimethylacetamide, 22 parts of tripropylene glycol, and 32.5 parts of dimethylformamide.

[0056] Its preparation method includes:

[0057] a. mixing polyvinylidene fluoride with dimethylacetamide to obtain a tackifier;

[0058] b. Boehmite is mixed with tripropylene glycol to obtain an inorganic filler slurry;

[0059] c. Disperse aramid fiber in dimethylformamide, stir for 1 hour, then add dimethyl carbonate, stir at 1000rmp for 0.75 hour, mix well with tackifier and inorganic filler slurry and stir for 1.5 hour, Instantly.

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Abstract

The invention provides aramid fiber coating liquid, a lithium-ion battery separator and preparation methods thereof, and relates to the field of materials for lithium-ion batteries. The preparation method of the aramid fiber coating liquid comprises the following steps of: dispersing aramid fibers in a third solvent, adding a pore-forming agent, uniformly stirring, then mixing with a tackifying material and inorganic filler slurry, and stirring for 1-2 hours, wherein the tackifying material is prepared by mixing a binding agent and a first solvent; and the inorganic filler slurry is prepared by mixing inorganic filler and a second solvent. The preparation method of the lithium-ion battery separator comprises the following steps of: coating at least one side of a basal membrane by using thearamid fiber coating liquid to form oily coating; and then extracting the oily coating in sequence by using a third solvent and water, and soon afterwards drying the oily coating extracted by water at the temperature of 40 to 90 DEG C. The lithium-ion battery separator provided by the invention has excellent heat shrinkage resistance and coating adhesive property; the cohesive force of the lithium-ion battery separator is 30-40 N / m; and the heat shrinkage of the lithium-ion battery separator is less than or equal to 5% (130 DEG C).

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to an aramid coating solution, a lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] With the development of the new energy vehicle market, how far the new energy vehicle can go depends ultimately on the power battery, and the separator is an important part of the lithium-ion battery, and its performance determines the interface structure and internal resistance of the battery, which directly affects the battery. Capacity, cycle performance and safety performance and other characteristics. Therefore, the research and development of new separators with excellent performance has become a top priority for the development of lithium-ion batteries, especially power lithium-ion batteries. [0003] At present, the existing coated aramid separator has the problem of poor thermal stability, and it is prone to shrinkage and deformation at...

Claims

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Application Information

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IPC IPC(8): C09D177/10C09D127/18C09D7/65C09D7/20H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/431
CPCH01M10/0525C09D177/10C09D7/20C09D7/61H01M50/403H01M50/411H01M50/44H01M50/449C08L27/18C08K3/346Y02E60/10
Inventor 徐锋杜全国袁海朝苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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