Preparation method of cell diaphragm based on aramid fiber

A kind of aramid fiber, battery separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve inconvenience and other problems, achieve small interaction, good thermal stability and automatic shutdown protection performance, good wettability Effect

Inactive Publication Date: 2012-09-26
LONGPONT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing methods for preparing battery separators obviously have inconveniences and defects in actual use, so it is necessary to improve them.

Method used

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  • Preparation method of cell diaphragm based on aramid fiber
  • Preparation method of cell diaphragm based on aramid fiber
  • Preparation method of cell diaphragm based on aramid fiber

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 (less than 1.5mm) 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 decomposed by a hydraulic deflagging machine at 1% weight concentration, it is further beaten by a disc mill, and the final pulping degree of beating is 10-70 ° SR slurry 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 wi...

Embodiment 2

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

[0035] Aramid 1414 fiber (less than 1.5mm) 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 (less than 1.5mm) 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 preparation method of a cell diaphragm based on aramid fiber. The cell diaphragm is prepared by taking ultrashort aramid fiber as a main material and matching with aramid fiber fibrid, and the specific requirements onof air permeability and porosity of the cell diaphragm can be met through regulating a fiber formula and a molding process. The cell diaphragm can realize the mechanical isolation function of the anode and cathode of a cell, simultaneously ensures low resistance and higher ion conductivity and has enough electrochemicalmechanical stability. Compared withthe traditional plastic diaphragm, the cell diaphragm prepared by the method has more excellent comprehensive performances, i.e. the advantages of excellent high temperature resistance, high strength, fatigue resistance, low deformation, frlame retardant property, chemical corrosion resistance, low specific gravity and the like. The cell diaphragm can be widely applied to manufacturing of variousion cells.

Description

technical field [0001] The invention relates to the diaphragm technology of ion batteries, in particular to a method for preparing 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 t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14C08L77/10H01M50/403H01M50/414H01M50/44
CPCY02E60/10
Inventor 刘宜云衡沛之王丽萍
Owner LONGPONT
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