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A reinforced film for battery isolation and its preparation method

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, smaller pore size

Active Publication Date: 2020-05-15
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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  • A reinforced film for battery isolation and its preparation method
  • A reinforced film for battery isolation and its preparation method
  • A reinforced film for battery isolation and its preparation method

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 r...

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 0.2mm.

[0060] (5) Lubricant r...

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 0.2mm.

[0083]...

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Abstract

A reinforced membrane for battery isolation and a preparation method thereof, characterized in that the biaxially stretched expanded polytetrafluoroethylene microporous filter membrane has a longitudinal tensile strength of 25-30Mpa and a transverse tensile strength of 20 ‑25Mp, the longitudinal modulus of elasticity reaches 70‑80Mpa, the transverse tensile strength reaches 50‑60Mpa, and the maximum longitudinal and transverse force reaches 3‑4N. Preparation steps: mixing-push-pressing-extrusion-calendering-removal of lubricant-longitudinal stretching-heat treatment-cooling setting-transverse stretching-heat setting-cooling setting. The invention is prepared by multi-channel stretching, heat treatment exceeding the normal melting point and cooling process. The process is reasonable, and the prepared film is a neatly arranged crystalline structure film with small nodules, high tensile strength, high elastic modulus, and creep resistance. Denaturation, hardness and dimensional stability, etc., and the longitudinal and transverse bidirectional tensile strengths are close, which not only makes the battery separator have better dimensional stability and higher mechanical properties, but also significantly reduces the internal resistance of the battery to improve battery performance and reduce the amount of membrane materials. ,cut costs.

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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Patent Type & Authority Patents(China)
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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