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Preparation method of lithium-ion battery diaphragm

A diaphragm and lithium battery technology, which is applied in the field of preparation of lithium battery diaphragms, can solve the problems of difficulty in ensuring the permeability and micropore uniformity of the diaphragm, and backward production methods, etc. Good performance and uniformity of micropores

Active Publication Date: 2016-02-24
浙江锂盾储能材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology and production methods of lithium-ion battery separators are relatively backward, and it is difficult to realize the preparation and production of lithium-ion battery separators with excellent comprehensive performance, especially the permeability and micropore uniformity of the separators are difficult to guarantee.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a lithium battery diaphragm, comprising the following steps:

[0021] Step 1, mixing polyethylene powder with a solvent to obtain a mixture containing polyethylene, wherein the mass ratio of the polyethylene powder to the solvent is 1:2, and the solvent is ethanol, toluene, trichloroethylene, tetrahydronaphthalene, The mixed solvent that decahydronaphthalene, sherwood oil, mineral oil forms, the mass content of described ethanol in described solvent is 2%;

[0022] Step 2, heating the mixture in step 1 at a heating temperature of 100-200°C to form a polyethylene melt, and casting the heated polyethylene melt onto the surface of the biaxially stretched nylon modified film, wherein the nylon The modified film is formed by mixing nylon and polypropylene, and the longitudinal and transverse stretch ratio of the bidirectionally stretched nylon film is 1.5;

[0023] Step 3, vacuum drying the nylon modified membrane, the temperature of the vacuum dryin...

Embodiment 2

[0028] A preparation method of a lithium battery diaphragm, comprising the following steps:

[0029] Step 1, mixing polyethylene powder with a solvent to obtain a mixture containing polyethylene, wherein the mass ratio of the polyethylene powder to the solvent is 1:3, and the solvent is ethanol, toluene, trichloroethylene, tetrahydronaphthalene, The mixed solvent that decahydronaphthalene, sherwood oil, mineral oil forms, the mass content of described ethanol in described solvent is 10%;

[0030] Step 2, heating the mixture in step 1 at a heating temperature of 100-200°C to form a polyethylene melt, and casting the heated polyethylene melt onto the surface of the biaxially stretched nylon modified film, wherein the nylon The modified film is formed by mixing nylon and polyethylene, and the longitudinal and transverse stretch ratio of the bidirectionally stretched nylon film is 2.0;

[0031] Step 3, vacuum drying the nylon modified membrane, the temperature of the vacuum dryin...

Embodiment 3

[0036] A preparation method of a lithium battery diaphragm, comprising the following steps:

[0037] Step 1, mixing polyethylene powder with a solvent to obtain a polyethylene-containing mixture, wherein the mass ratio of the polyethylene powder to the solvent is 1:4, and the solvent is ethanol, toluene, trichloroethylene, tetrahydronaphthalene, The mixed solvent that decahydronaphthalene, sherwood oil, mineral oil forms, the mass content of described ethanol in described solvent is 20%;

[0038] Step 2, heating the mixture in step 1 at a heating temperature of 100-200°C to form a polyethylene melt, and casting the heated polyethylene melt onto the surface of the biaxially stretched nylon modified film, wherein the nylon The modified film is formed by mixing nylon with polypropylene and polyethylene, and the longitudinal and transverse stretch ratio of the bidirectionally stretched nylon film is 2.0;

[0039] Step 3, vacuum drying the nylon modified membrane, the temperature ...

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Abstract

The invention discloses a preparation method of a lithium-ion battery diaphragm, comprising the following steps: step 1, mixing polyethylene powder with a solvent, thus obtaining a polyethylene-containing mixture; step 2, heating the mixture in step 1 with a heating temperature of 100-200 DEG C, thus forming a polyethylene molten mass, and curtain-coating the heated polyethylene molten mass to the surface of a nylon modified membrane in biaxial preliminary stretching; step 3, vacuum-drying the nylon modified membrane; step 4, performing plasma corona treatment on the nylon modified membrane under an oxygen environment; step 5, biaxially stretching the nylon modified membrane again, thus obtaining a finished product. The preparation method is simple and reasonable in process and high in yield, and the prepared diaphragm has the characteristics of high diaphragm rupture temperature, small hot-shrinkage rate, low pore-closing temperature, good liquid absorption and keeping capability, good permeability and micropore uniformity, good safety performance and the like.

Description

technical field [0001] The invention relates to the field of production of lithium-ion battery diaphragms, in particular to a preparation method of lithium-ion battery diaphragms. Background technique [0002] Lithium-ion batteries are important green energy batteries. Due to their light weight, large specific capacity and safety, they have been widely used in mobile power supplies, notebook computers, mobile phones, and power vehicles. Lithium-ion batteries are generally composed of battery casing (packaging material), positive electrode, negative electrode, diaphragm and electrolyte. The diaphragm is an important material for isolating the positive and negative electrodes of the inner core of the battery. During the use of the battery, lithium ions can freely pass through the diaphragm to realize the battery life. The quality of charging and discharging is directly related to the service life and safety performance of the battery. [0003] With the rapid development of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/491
CPCH01M10/0525H01M50/40H01M50/409H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 章结兵谢凤秀
Owner 浙江锂盾储能材料技术有限公司
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