Battery diaphragm based on aramid fibre

A battery separator, aramid fiber technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems affecting the application of battery separators, a large number of solvents, difficult to control and other problems, and achieve thermal stability and automatic shutdown protection performance Good, good spatial stability and flatness, small interaction effect

Inactive Publication Date: 2010-10-20
深圳昊天龙邦复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of film production by melt stretching method, the factors affecting the film structure include the process conditions such as melt draw ratio, extrusion temperature and heat treatment temperature, the degree of molecular orientation is affected by the melt draw ratio and extrusion temperature, and the film crystallinity is affected by the melt draw ratio. The effect of elongation ratio and heat treatment temperature is not easy to control during the film making process
The thermal-induced phase separation process is easy to control and can better control the pore size, pore size distribution and porosity, but the preparation process requires a large amount of solvent, which is easy to cause environmental pollution. Compared with the melt stretching method, the process is relatively complicated.
The above two molding materials are polyolefin plastics such as polyethylene and polypropylene, which have poor heat resistance, which seriously affects the application of battery separators in a wider range of fields.
[0004] In summary, the existing battery diaphragm technology obviously has inconvenience and defects in actual use, so it is necessary to improve it.

Method used

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  • Battery diaphragm based on aramid fibre
  • Battery diaphragm based on aramid fibre
  • Battery diaphragm based on aramid fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare the battery separator of Example 1 according to the following ratio:

[0028] Aramid 1414 fiber (2-4mm) 75 parts by weight

[0029] Aramid 1414 precipitated fiber 25 parts by weight

[0030]After the aramid fiber 1414 fiber with the above content is 1% by weight, it is thawed by a hydraulic deflagging machine, and then further beaten by disc grinding, and the final pulping degree is 10-70° SR pulp A. The aramid 1414 precipitated fiber with the above content is decomposed in a hydraulic deflaker, and further beaten by disc grinding, and finally made into SR slurry B with a degree of percussion of 10-75°, and then adding water to slurry A and slurry B in the batching tank Mix well to form a slurry that can be added to the former headbox, adding the appropriate amount of polyethylene oxide to the stabilizer box. The head of the slurry on the net is adjusted by the stabilizer box, and the slurry is evenly distributed on the forming wire in the headbox, and the exc...

Embodiment 2

[0034] Prepare the battery separator of Example 2 according to the following parts by weight:

[0035] Aramid 1414 fiber (2-4mm) 97 parts by weight

[0036] Aramid 1414 precipitated fiber 3 parts by weight

[0037] The preparation method of the battery separator is the same as in Example 1, and the results obtained are shown in Table 2:

[0038] Table 2

[0039]

[0040]

Embodiment 3

[0042] The battery separator of Example 3 was prepared in the following parts by weight:

[0043] Aramid 1414 fiber (2-4mm) 65 parts by weight

[0044] Aramid 1414 precipitated fiber 35 parts by weight

[0045] The preparation method of the battery separator is the same as in Example 1, and the test results obtained are shown in Table 3:

[0046] table 3

[0047]

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Abstract

The invention discloses a battery diaphragm based on aramid fibre. The battery diaphragm is manufactured mainly from ultra-short aramid fibre in match with aramid fibre fibrid, and the specific requirements of air permeability and porosity of the battery diaphragm can be satisfied through adjusting fibre formula and molding process. The battery diaphragm can realize mechanical isolation function of the positive and negative poles of the battery, ensures low resistance and high ion electrical conductivity simultaneously, and has enough electrochemistry stability. Compared with traditional plastic diaphragm, the battery diaphragm in the invention has more excellent comprehensive properties, i.e. excellent heat resistance performance, high strength, fatigue resistance performance, low deformation, fire-resistant and flame retardant performance, chemical-corrosion resistance performance and the like. The battery diaphragm in the invention can be widely applied to the manufacturing of various ion batteries.

Description

technical field [0001] The invention relates to the diaphragm technology of ion batteries, in particular to a battery diaphragm based on aramid fibers. Background technique [0002] Since Sony (SONY) successfully developed lithium-ion batteries in the early 1990s, lithium-ion batteries have developed rapidly due to their excellent electrical properties such as high energy density, long cycle life, and high voltage. At present, it has been widely used in the fields of electronic products such as mobile phones, portable computers, cameras, and video cameras, and the application fields are still expanding. Lithium-ion batteries consist of positive and negative electrodes, electrolytes and separators. Among them, an important function of the separator is to isolate the positive and negative electrodes and prevent the passage of electrons in the battery, while allowing the passage of ions, thereby completing the rapid transmission of lithium ions between the positive and negativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/44
CPCY02E60/10
Inventor 刘宜云衡沛之王丽萍
Owner 深圳昊天龙邦复合材料有限公司
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