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Preparation method of para-aramid/PP non-woven fabric lithium ion battery diaphragm

A lithium-ion battery and para-aramid technology, which is applied in secondary batteries, battery components, circuits, etc., can solve problems such as poor performance, achieve the effects of increasing porosity, good fluidity, and avoiding pore blockage

Active Publication Date: 2019-12-27
山东精恒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the separators in lithium-ion batteries are mainly made of polyethylene film and polypropylene film. The materials are easy to obtain, but the performance is slightly poor; while the para-aramid fiber has the advantages of high strength, high modulus, high temperature resistance, etc., can be Used for composite film formation to achieve a balance between performance and cost

Method used

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  • Preparation method of para-aramid/PP non-woven fabric lithium ion battery diaphragm
  • Preparation method of para-aramid/PP non-woven fabric lithium ion battery diaphragm

Examples

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preparation example Construction

[0027] A kind of preparation method of p-aramid fiber / PP non-woven fabric lithium-ion battery diaphragm, comprises the following steps:

[0028] S1, select PP non-woven fabric as the base material;

[0029] S2, preparation of pore-forming agent solution, dissolving benzoic acid in N-methylpyrrolidone, the concentration is 0.2-8mol / L, and the temperature of N-methylpyrrolidone is 60-80°C;

[0030] S3. Immerse the PP non-woven fabric in S1 into the pore-forming agent solution prepared in S2. After 1-10 minutes, take out the PP non-woven fabric, and lower its temperature to below 30°C, and clean the surface of the PP non-woven fabric to make it smooth and free. impurities;

[0031] S4, the preparation of para-aramid fiber slurry, in N 2 Under protection, add 0.5-1 weight part of CaCl to 100 weight parts of N-methylpyrrolidone 2 and 1-2 parts by weight of p-phenylenediamine, stirred at normal temperature until completely dissolved, the stirring speed is 400-500r / min; then add 2...

Embodiment 1

[0037] In S2, benzoic acid was dissolved in N-methylpyrrolidone at a temperature of 60°C with a concentration of 0.2mol / L; in S3, the PP non-woven fabric was immersed for 1 min, and the temperature was lowered to 30°C after taking it out; in S4 , add 0.5 parts by weight of CaCl to 100 parts by weight of N-methylpyrrolidone 2and 1 part by weight of p-phenylenediamine, stirred at normal temperature until completely dissolved, and the stirring speed was 500r / min; then added 2 parts by weight of terephthaloyl chloride, kept stirring and carried out polymerization reaction, and the reaction time was 30min; In S5, the thickness of the para-aramid slurry on the PP non-woven fabric was 40 μm; in S6, the mass fraction of sulfuric acid in the coagulation bath was 5%, the temperature of the coagulation bath was 5 °C, and the coagulation time was 6 min; in S8, 100 Sublimation of benzoic acid by heating at ℃ for 5 minutes; pressing with hot pressing roller at 100℃ for 20 minutes. The thic...

Embodiment 2

[0039] In S2, benzoic acid was dissolved in N-methylpyrrolidone at a temperature of 65°C with a concentration of 4mol / L; in S3, the PP non-woven fabric was immersed for 5min, and the temperature was lowered to 20°C after taking it out; in S4, Add 0.6 parts by weight of CaCl to 100 parts by weight of N-methylpyrrolidone 2 and 1.3 parts by weight of p-phenylenediamine, stirred at normal temperature until fully dissolved, and the stirring speed was 430r / min; then added 2.6 parts by weight of terephthaloyl chloride, kept stirring and carried out polymerization reaction, and the reaction time was 30min; In S5, the thickness of the para-aramid slurry on the PP non-woven fabric was 50 μm; in S6, the mass fraction of sulfuric acid in the coagulation bath was 8%, the temperature of the coagulation bath was 5 °C, and the coagulation time was 3 min; in S8, 110 Heating at ℃ for 6 minutes to sublimate benzoic acid; hot pressing roller at 120 ℃ for 10 minutes, during this process, accompani...

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Abstract

The invention provides a preparation method of a para-aramid / PP non-woven fabric lithium ion battery diaphragm and relates to the technical field of a para-aramid / PP non-woven fabric lithium ion battery diaphragm. The method is advantaged in that PP non-woven fabric is selected as a substrate material, pores in the PP non-woven fabric are occupied by pore forming agent, then the PP non-woven fabric is immersed into para-aramid pulp, curing is conducted in a sulfuric acid coagulating bath, the pore forming agent is heated and sublimated, the pores are vacated, and the diaphragm thickness film is determined through hot pressing. Compared with the prior art, the method is advantaged in that the PP non-woven fabric is directly coated with the para-aramid polymerization solution for reinforcement, the process is completed in one step, and influence of external factors is small; the porosity of the para-aramid / PP non-woven fabric lithium ion battery diaphragm is effectively improved due to occupation of the pore-forming agent; the sulfuric acid solution is adopted as a coagulating bath, so the high porosity of the PP non-woven fabric layer is not only maintained, but also the pore structure of the PP non-woven fabric layer is maintained, and uniformity and consistency of diaphragm pores of the para-aramid fiber layer are realized.

Description

technical field [0001] The invention relates to the technical field of para-aramid / PP non-woven lithium-ion battery diaphragms, in particular to a preparation method of para-aramid / PP non-woven lithium-ion battery diaphragms. Background technique [0002] In mobile phones, computers and electric vehicles, batteries that can be charged and discharged many times are mainly lithium-ion batteries. The key to charging and discharging lithium-ion batteries lies in the regular movement of lithium ions between the positive and negative electrodes; specifically, when charging, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. In addition to the positive electrode, negative electrode and electrolyte, there is also a diaphragm inside the lithium-ion battery. The function of the diaphragm is to separate the positive and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/44Y02P70/50
Inventor 赵会岩韩正奇赵海林
Owner 山东精恒科技有限公司
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