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Manufacturing method for lithium ion battery diaphragm

A technology for lithium-ion batteries and diaphragms, which is applied to battery components, chemical instruments and methods, circuits, etc., and can solve problems such as poor control of porosity and pore size, uneven pore size distribution, and poor thermal stability. , to achieve the effect of good pro/liquid retention performance, uniform mechanical strength, and regular arrangement of fiber chains

Inactive Publication Date: 2014-04-02
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dry method has a simple process, so the porosity and pore size cannot be well controlled
The current polyolefin separator produced by dry method has the disadvantages of uneven pore size distribution, low mechanical strength, poor thermal stability and poor affinity / retention

Method used

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  • Manufacturing method for lithium ion battery diaphragm
  • Manufacturing method for lithium ion battery diaphragm
  • Manufacturing method for lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] See Table 1 for the original formulation of the Li-ion battery separator in this example.

[0028] The preparation method of the lithium-ion battery separator of the present embodiment comprises the following steps:

[0029] (1) Weigh each raw material according to the ratio of raw materials shown in Table 1, make a mixture of cotton fiber and water at a ratio of 4:100, put it in a beater, and obtain cotton pulp with a beating degree of 60°, and dehydrate it. , measure its moisture content;

[0030] (2) Make a mixture of the cotton pulp obtained in step (1) and water at a ratio of 1:100, add antioxidants and flame retardants, stir and disperse, dehydrate and form on a copper grid, and then press and dry at 90°C to form a film ,stand-by;

[0031] (3) Make a suspension of modified polypropylene fiber and water at a ratio of 1:100, add an adhesive, stir, and evenly disperse it on a copper grid for dehydration to form, and dry at 110°C to form a film;

[0032] (4) Repeat...

Embodiment 2

[0036] See Table 1 for the original formulation of the Li-ion battery separator in this example.

[0037] The preparation method of the lithium-ion battery separator of the present embodiment comprises the following steps:

[0038] (1) Weigh each raw material according to the ratio of raw materials shown in Table 1, make a mixture of cotton fiber and water at a ratio of 4:100, put it in a beater, and obtain cotton pulp with a beating degree of 60°, and dehydrate it. , measure its moisture content;

[0039] (2) Make a mixture of cotton pulp and water obtained in step (1) at a ratio of 1:100, add antioxidants and flame retardants, stir and disperse, dehydrate and form on a copper grid, and then press and dry at 110°C to form a film ,stand-by;

[0040] (3) Make a suspension of modified polypropylene fiber and water at a ratio of 1:100, add an adhesive, stir, and evenly disperse it on a copper grid for dehydration to form, and dry at 90°C to form a film;

[0041] (4) Repeat ste...

Embodiment 3

[0045] See Table 1 for the original formulation of the Li-ion battery separator in this example.

[0046] The preparation method of the lithium-ion battery separator of the present embodiment comprises the following steps:

[0047] (1) Weigh each raw material according to the ratio of raw materials shown in Table 1, make a mixture of cotton fiber and water at a ratio of 4:100, put it in a beater, and obtain cotton pulp with a beating degree of 60°, and dehydrate it. , measure its moisture content;

[0048] (2) Make a mixture of cotton pulp and water obtained in step (1) at a ratio of 1:100, add antioxidants and flame retardants, stir and disperse, dehydrate and form on a copper grid, and then press and dry at 110°C to form a film ,stand-by;

[0049] (3) Make a suspension of modified polypropylene fiber and water at a ratio of 1:100, add an adhesive, stir, and evenly disperse it on a copper grid for dehydration to form, and dry at 90°C to form a film;

[0050] (4) Repeat ste...

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Abstract

The invention relates to a lithium ion battery diaphragm and a preparation method of the lithium ion battery diaphragm. The lithium ion battery diaphragm provided by the invention is divided into three layers, wherein a core layer is a cotton fiber film layer; an upper layer and a lower layer are polypropylene fiber film layers; the core layer of the diaphragm is a film formed by pulping cotton fibers and then performing a wet manufacturing technology on the pulped cotton fibers by using an antioxidant, a fire retardant and the like; each surface layer is a film formed by performing hydrophilic modification on polypropylene fibers and then performing the wet manufacturing technology on the modified polypropylene fibers by using an adhesive; the cotton fiber film is used as the core layer, and the polypropylene fiber films are used as the upper surface layer and the lower surface layer, so that the lithium ion battery diaphragm is prepared by hot pressing by two hot pressing rollers under the condition of 110-150 DEG C. The porosity of the lithium ion battery diaphragm is 40-80 percent, and the aperture is 0.01-0.2 microns; the tensile strength of the lithium ion battery diaphragm in both the longitudinal direction and the transverse direction is basically the same, which is 120-300Mpa; the puncture strength is higher than 20kg.mm<-1>; under 90 DEG C, the shrinkage rate is less than 1 percent; the lithium ion battery diaphragm is 20-60 microns thick. The lithium ion battery diaphragm is uniform in porosity distribution, high in mechanical strength, low in shrinkage rate, high in thermal stability and high in hydrophilicity / liquid retaining performance and is easy to prepare, pollution-free and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a lithium-ion battery separator and a preparation method thereof. Background technique [0002] Separator is one of the key materials of lithium-ion batteries. It is used to block the positive and negative electrodes, prevent short circuit in the battery, and allow ions to pass through, so as to complete the transmission of lithium ions between the positive and negative electrodes during electrochemical charging and discharging. The performance of the separator determines the internal resistance of the battery, which directly affects the capacity, charge and discharge characteristics of the battery. As a lithium-ion battery separator, it must have good mechanical strength, especially puncture resistance, corrosion resistance of electrolyte, suitable porosity, high lyophilicity and liquid retention performance. Separators with excellent performance play an important r...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18H01M50/403H01M50/411H01M50/457H01M50/463H01M50/489
CPCB32B9/02B32B9/045B32B27/12B32B27/32B32B2457/10B32B2307/202B32B2307/308B32B2262/062B32B2262/0253B32B2250/20H01M50/411H01M50/44H01M50/4295H01M50/403Y02E60/10
Inventor 张雄飞陈启杰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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