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Preparation method of composite diaphragm of gel polymer lithium ion battery

A gel polymer and lithium-ion battery technology, which is applied to battery components, circuits, electrical components, etc., can solve the problem of undescribed gel polymer solution application process, unclear performance of composite diaphragm, and unsuitable for practical use Industrial production and other issues, to achieve the effects of good assembly processing adaptability, reliable heat sealing performance, good absorption and retention capacity

Inactive Publication Date: 2012-05-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not describe the application process of the gelled polymer solution, so that the performance of the composite separator after activation in the liquid electrolyte is not clear. At the same time, this method needs to use heat treatment to remove the solvent in the coating, which consumes energy and pollutes the environment. Suitable for actual industrial production

Method used

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preparation example Construction

[0019] The preparation method (referred to as the preparation method) of the gel polymer lithium-ion battery composite separator (referred to as the composite separator) designed in the present invention mainly includes five steps: (1) Configuration of the gel polymer (or gelable polymer) solution ; (2) selection of non-woven fabric (reinforced) base fabric; (3) coating processing technology; (4) desolvation treatment process; (5) dehydration and drying process. There is no sequence relationship between the processes of the steps (1) and (2). The technical problems to be solved by the present invention mainly include: a simple coating solution formulation, a non-woven fabric reinforced base fabric with certain properties, appropriate coating process parameters and an environmentally friendly solvent removal method.

[0020] The configuration of the gel polymer (or gelable polymer) solution in the preparation method of the present invention is the first and also an important st...

Embodiment 1

[0031] (1) Select the concentration (ratio of solute mass to solvent volume, the same below) of 20% polyvinylidene fluoride to dissolve in a solvent with a volume ratio of acetone:DMF=4:6, at 61°C, after sealing and stirring for 90min, at room temperature Cooling, static defoaming for 50min stand-by.

[0032] (2) Select the quantitative value as 48 g / m 2 , ES fiber staple fiber hot-rolled non-woven fabric with a thickness of 50 μm, a porosity of 44%, and a transverse (longitudinal) breaking strength of 64 (108) N / 5cm is the reinforcing base fabric.

[0033] (3) Apply the solution configured in (1) to the non-woven fabric in (2) by one-sided blade coating to prepare a composite separator, with a coating thickness of 13 μm and a coating speed of 1.2 m / min.

[0034] (4) After immersing the composite diaphragm in a water bath with a temperature of 23°C for 30 minutes, rinse it once with clean water to remove the solvent.

[0035] (5) After dehydration for 60 minutes, the composi...

Embodiment 2

[0037] (1) Select PVDF with a concentration of 30% and dissolve it in a solvent with a volume ratio of acetone:DMF=5:5, seal and stir at 65°C for 78 minutes, cool at room temperature, and statically defoaming for 43 minutes before use.

[0038] (2) Select the quantitative value as 23 g / m 2 , a polypropylene spunbond hot-rolled non-woven fabric with a thickness of 40 μm, a porosity of 77%, and a transverse (longitudinal) breaking strength of 36 (59) N / 5cm as the base fabric.

[0039] (3) Apply the solution configured in (1) to the non-woven fabric in (2) by one-sided blade coating to prepare a composite separator, with a coating thickness of 23 μm and a coating speed of 3 m / min.

[0040] (4) The composite diaphragm is immersed in a water bath with a temperature of 45°C for 23 minutes, and then rinsed twice with clean water to remove the solvent.

[0041] (5) After dehydration for 45 minutes, and then drying in an oven at 73° C. for 55 minutes, the composite membrane of the pre...

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Abstract

The invention discloses a preparation method of a composite diaphragm of a gel polymer lithium ion battery. In the preparation method, non-woven fabrics are used as enhanced fabrics, a gel polymer solution is used as a coating; and the preparation method sequentially comprises the steps of coating, desolvating, dewatering and drying, wherein the gel polymer solution uses polyvinylidene fluoride as a solute, uses a mixed solution of acetone and N, N-dimethylformamide in a volume ratio of 4 / 6 to 6 / 4 as a solution, and the ratio of the solute quality to the solution volume is 20% to 50%; and heating in a sealed environment to 60-70 DEG C to dissolve the solute, wherein the enhanced fabrics of the non-woven fabrics are manufactured by long filaments or short fibers of polyethylene fiber, polypropylene fiber or polyethylene / polypropylene composite fiber, have the ration of 20-60 g / m2, the thickness of 40-80 microns, the porosity factor of 40-80 percent, the transversal rupture strength of 35-98 N / 5 cm and the longitudinal rupture strength of 58-152 N / 5 cm.

Description

technical field [0001] The invention relates to lithium-ion battery manufacturing technology, in particular to a preparation method of a gel polymer lithium-ion battery composite diaphragm. Background technique [0002] Lithium ions not only have the characteristics of high specific energy, long cycle life, no memory effect, etc., but also are environmentally friendly and pollution-free. Therefore, they are widely used in digital products such as mobile phones, notebook computers, and MP3. The application of power batteries has also begun. [0003] The battery separator is an important part of the lithium-ion battery. It is placed between the anode and cathode, preventing physical contact of the electrodes while ensuring free transport of ions and isolation of electron flow. The basic requirement of a battery separator is that it must have good chemical and electrochemical stability to the electrolyte and electrodes, and at the same time must have strong mechanical propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/411H01M50/44
CPCY02E60/10
Inventor 焦晓宁程博闻贾庆龙倪冰选阮艳莉
Owner TIANJIN POLYTECHNIC UNIV
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