Battery isolating strengthening membrane and preparation method thereof

A technology for enhancing membranes and batteries, which is applied to battery components, chemical instruments and methods, membranes, etc., can solve the problem that the isolation membrane cannot withstand the strong oxidation and degradation of free radicals in the battery, and achieve a small difference in elastic modulus , fewer nodules, and easy fibrosis

Active Publication Date: 2018-11-13
리자오후이 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above two kinds of battery separators are made of polyethylene, polypropylene and other materials. Although they can meet the needs of use in terms of performance, compared with the biaxially stretched expanded polytetrafluoroethylene reinforced film, other separators have no The method is to withstand the strong oxidation environment of free radicals in the battery, and it will degrade soon. This is also the reason why biaxially oriented expanded polytetrafluoroethylene reinforced membranes are being developed as battery separators worldwide.

Method used

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  • Battery isolating strengthening membrane and preparation method thereof
  • Battery isolating strengthening membrane and preparation method thereof
  • Battery isolating strengthening membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Material: DuPont 601A PTFE fine powder is used.

[0034] Processing steps:

[0035] Mixing-push-pressing-extrusion-calendering-lubricant removal-multiple longitudinal stretching-heat treatment-cooling setting-transverse stretching-heat setting-cooling setting.

[0036] Specifically:

[0037] (1) Mixing: Take an appropriate amount of polytetrafluoroethylene (PTFE) powder, add lubricant Isopar in a proportion of 25%, stir well, pour it into a heat preservation bucket after sieving, and keep it warm at 40°C for 24 hours.

[0038] (2) Pushing: Under a pressure of 2Mpa, push the heat-preserved PTFE fine powder into a cylindrical blank.

[0039] (3) Extrusion: Extrude the cylindrical billet into a continuous strip-shaped film with a width of 180 mm and a thickness of 2.0 mm at 40° C. with a fishtail die.

[0040] (4) Calendering: The width of the film remains unchanged, and it is rolled longitudinally to a PTFE strip film with a thickness of 0.2 mm.

[0041] (5) Lubricant...

Embodiment 2

[0053] Material: Daikin F106C PTFE fine powder is used.

[0054] Processing steps: mixing - pushing - extrusion - calendering - removal of lubricant - longitudinal stretching - heat treatment - cooling setting - transverse stretching - heat setting - cooling setting.

[0055] Specifically:

[0056] (1) Mixing: Take an appropriate amount of polytetrafluoroethylene (PTFE) powder, add lubricant Isopar in a proportion of 25%, stir well, pour it into a heat preservation bucket after sieving, and keep it warm at 60°C for 36 hours.

[0057] (2) Pushing: Under a pressure of 6Mpa, push the heat-retaining PTFE fine powder into a cylindrical blank.

[0058] (3) Extrusion: Extrude the cylindrical billet into a continuous strip-shaped film with a width of 180 mm and a thickness of 2.0 mm at 60° C. with a fishtail die.

[0059] (4) Calendering: The width of the film remains unchanged, and it is rolled longitudinally to a PTFE strip film with a thickness of 0.2 mm.

[0060] (5) Lubricant ...

Embodiment 3

[0075] Material: DuPont 601A PTFE fine powder is used.

[0076] Processing steps:

[0077] Mixing - Pushing - Extruding - Calendering - Removing lubricant - Longitudinal stretching - Heat treatment - Cooling and setting - Transverse stretching - Heat setting - Cooling and setting.

[0078] Specifically:

[0079] (1) Mixing: Take an appropriate amount of polytetrafluoroethylene (PTFE) powder, add lubricant Isopar in a proportion of 25%, stir well, pour it into a heat preservation bucket after sieving, and keep it warm at 80°C for 48 hours.

[0080] (2) Pushing: Under a pressure of 10Mpa, push the heat-retaining PTFE fine powder into a cylindrical blank.

[0081] (3) Extrusion: Extrude the cylindrical billet into a continuous strip-shaped film with a width of 180 mm and a thickness of 2.0 mm at 80° C. with a fishtail die.

[0082] (4) Calendering: The width of the film remains unchanged, and it is rolled longitudinally to a PTFE strip film with a thickness of 0.2 mm.

[0083...

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Abstract

Disclosed are a battery isolating strengthening membrane and a preparation method thereof. The battery isolating strengthening membrane is characterized by being prepared from a biaxially oriented expanded polytetrafluoroethylene microfiltration membrane, which achieves a longitudinal tensile strength of 25-30 Mpa, a transverse tensile strength of 20-25 Mpa, a longitudinal elasticity modulus of 70-80 Mpa, a transverse elasticity modulus of 50-60 Mpa, and longitudinal and transverse maximum force of 3-4 N. The preparation method of the battery isolating strengthening membrane comprises the steps of material blending, pushing, extrusion, rolling, lubricant removal, longitudinal orientation, thermal treatment, cooling and shaping, transverse orientation, thermal formation and cooling formation. The battery isolating strengthening membrane is prepared through reasonable processes of multiple orientation, thermal treatment at temperature higher than normal melting point, and cooling; the prepared battery isolating strengthening membrane is an orderly arranged crystallized structural membrane, which is low in knotting, high in tensile strength and elasticity modulus, and good in creep resistance, hardness and dimensional stability and the like. With longitudinal and transverse strengths closely similar, the prepared battery isolating strengthening membrane can not only be better in dimensional stability and higher in mechanical performance, but also significantly reduce battery internal resistance to improve the battery performance and reduce membrane material consumption and thecost.

Description

technical field [0001] The invention belongs to the technical field of film preparation, and in particular relates to a reinforced film for battery isolation and a preparation method thereof. Background technique [0002] Membrane technology is an internationally recognized green and energy-saving high-tech in the 21st century. In today's world, global warming, energy shortages, water shortages, and environmental pollution are all closely related to membrane technology. [0003] Membrane is a green technology developed on the basis of bionics. It is a chemical composite material with selective separation characteristics artificially synthesized by imitating the function of cell membrane. According to the application of the membrane, the membrane can be divided into reverse osmosis membrane, nanofiltration membrane, ultrafiltration membrane, microfiltration membrane, gas separation membrane, pervaporation membrane, ion exchange membrane, proton exchange membrane, molecular di...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/406H01M50/426H01M50/494
CPCH01M50/44H01M50/426H01M50/494H01M50/406B29D7/01C08L27/18Y02E60/10B29C55/143B29C55/005B29C55/18B29C48/95B29C48/91B29C48/022B29C48/08B29C48/305B29K2027/18B29C48/0018B29K2105/0038B01D71/36B01D67/0025B01D69/02B01D2325/24B01D67/00111B01D67/00113B29L2031/755Y02P70/50
Inventor 李朝晖
Owner 리자오후이
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