Preparation method of para-aramid nanometer fiber composite lithium ion battery separator

A para-aramid fiber and nanofiber technology is applied in the field of preparation of para-aramid nanofiber composite lithium ion battery separator, which can solve the problem of poor separator adhesion, increased surface energy of coating slurry, poor battery performance, etc. problems, to achieve the effect of improving high temperature resistance, saving solvent and energy, low viscosity and surface energy

Active Publication Date: 2017-12-08
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the following problems: PPTA fibers or resins are difficult to dissolve, and the adhesion to the polyolefin separator is poor, and additional binders need to be added
On the one hand, there are other impurities in the composite membrane, and on the other hand, the porosity is reduced, both of which will cause a decline in battery performance.
The 2nd, in the Japanese patent that the patent No. is unexamined 2010-254731, proposed the technology that the polymerization solution of p-aramid fibers is coated as a slurry, but still there are following three problems in its technical scheme: (1 ) A large amount of solubilizing salt (the solubilizing salt is more than 6% of the solvent quality) has been added in the aramid polymer solution, which causes the surface energy of the

Method used

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  • Preparation method of para-aramid nanometer fiber composite lithium ion battery separator
  • Preparation method of para-aramid nanometer fiber composite lithium ion battery separator

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Example Embodiment

[0022] The preparation method of para-aramid nanofiber composite lithium ion battery diaphragm provided by the present invention includes the following steps:

[0023] (1) Preparation of para-aramid polymer slurry:

[0024] Under the protection of nitrogen, add 1.5 to 3 parts of solubilizing salt and 0.5 to 2.5 parts of p-phenylenediamine to 100 parts by weight of N-methyl-2-pyrrolidone with a water content of less than 100 ppm, and stir in an ice water bath until it is completely dissolved. Then add terephthaloyl chloride, keep stirring for polymerization, wherein the molar ratio of terephthaloyl chloride to p-phenylenediamine is 1.000~1.010, polymerization reaction is 10~30 minutes, stop stirring, and obtain para-aramid polymer slurry Material, wherein the solubilizing salt is calcium chloride or lithium chloride;

[0025] (2) Coating:

[0026] Coating the para-aramid polymer slurry on the surface of the base film by a coating method to prepare a coating film, wherein the thickness...

Example Embodiment

[0033] Example 1:

[0034] Measure 1 LN-methyl-2-pyrrolidone, add 20.00g calcium chloride and 17.30g p-phenylenediamine to it under nitrogen protection and ice water bath, stir at 500rpm until it is completely dissolved, then set the stirring speed Raise it to 800rpm and add 32.71g terephthaloyl chloride to it, stop stirring after 12 minutes of reaction; spread a polypropylene porous film with a thickness of 25μm on the automatic coating machine, adjust the blade height to 150μm, at a speed of 3m / min Coating; immerse the coated diaphragm in a coagulation bath containing N-methyl-2-pyrrolidone: water = 9:1 (v:v) to coagulate, take it out after 30 seconds, and wash with water for 20 seconds at 100°C Dry for 15 minutes to obtain a lithium-ion battery separator composited with para-aramid nanofibers. The thickness of the para-aramid nanofiber composite lithium ion battery separator is 30 μm, and the thickness of the para-aramid nanofiber layer is 5 μm.

[0035] The surface morphology...

Example Embodiment

[0036] Example 2:

[0037] Measure 1 LN-methyl-2-pyrrolidone, add 15.00g calcium chloride and 5.00g p-phenylenediamine to it under nitrogen protection and ice water bath, stir at 500rpm until it is completely dissolved, then set the stirring speed Raise to 800rpm and add 9.45g terephthaloyl chloride to it, stop stirring after 30 minutes of reaction; spread a polyethylene porous film with a thickness of 20μm on the automatic coating machine, adjust the height of the blade to 50μm at a speed of 3m / min Coating; immerse the coated separator in a coagulation bath containing N-methyl-2-pyrrolidone: water = 19:1 (v:v) to coagulate, take it out after 10 seconds, and wash with water for 8 seconds at 100°C Dry for 1 minute to obtain a lithium ion battery separator composited with para-aramid nanofibers. The thickness of the para-aramid nanofiber composite lithium ion battery separator is 20.5 μm, and the thickness of the para-aramid nanofiber layer is 0.5 μm.

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Abstract

The invention relates to a preparation method of a para-aramid nanometer fiber composite lithium ion battery separator, and belongs to the technical field of a high polymer material. The preparation method comprises the steps of preparing para-aramid polymer paste, coating the para-aramid polymer paste on a surface of a base membrane by a coating method, and solidifying the coating film in coagulation bath comprising N-methly-2-pyrrolidone and water to obtain the para-aramid nanometer fiber composite lithium ion battery separator; and washing and drying the para-aramid nanometer fiber composite lithium ion battery separator to obtain a finished product of the para-aramid nanometer fiber composite lithium ion battery separator. Compared with the prior art, the preparation method has the advantages that a solvent and an energy source are saved, energy consumption is also reduced, and unfavorable influence of impurity on battery performance is prevented; and moreover, the preparation process is simple, and the high-temperature resistant performance of the separator is improved, the prepared separator has favorable ion conductivity and can obtain relatively good performance when used as the lithium ion battery separator.

Description

technical field [0001] The invention relates to a method for preparing a para-aramid nanofiber composite lithium-ion battery diaphragm, and belongs to the technical field of polymer materials. Background technique [0002] In recent years, the lithium-ion battery industry has developed rapidly. As a mature and common form of energy in mobile devices, compared with other types of batteries, it has the characteristics of high energy density, high working voltage, no memory effect and long cycle life. A lithium-ion battery generally includes a positive electrode, a negative electrode, a separator, and an electrolyte. The separator serves to make the positive and negative electrodes in a state of electronic insulation but conduction of lithium ions. With the rise of electric vehicles, the emergence of high-power power batteries poses a huge challenge to the safety of lithium-ion batteries. At present, the common lithium-ion battery separator is made of polyolefin, usually a sa...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16C08G69/28C08G69/32H01M50/403H01M50/411H01M50/449H01M50/489
CPCC08G69/28C08G69/32H01M50/411H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 庹新林何濂远
Owner TSINGHUA UNIV
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