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Fluorine-containing resin based membrane reinforced by homogenous fibers modified by oriented fibers

A technology of fluorine-containing resin and modified fiber, which is applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of ineffective improvement of the mechanical properties of the diaphragm, unsatisfactory mechanical properties of the diaphragm, and easy aggregation of inorganic nanoparticles , to achieve significant and long-lasting enhancement effects, perfect compatibility, and promote application effects

Active Publication Date: 2016-01-20
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] PVDF, PCTFE, PTFE and other fluorine-containing resin-based composite separators have attracted great attention in the field of power battery separators due to their convenient preparation and excellent electrochemical properties. However, the mechanical properties of this kind of separators are not satisfactory, and their tensile strength generally does not exceed 20MPa, which limits its application in industry
[0003] The above composite diaphragm can be prepared by phase inversion method, casting method and other processes. In order to improve the mechanical properties of the composite diaphragm, inorganic nanoparticles, such as Al 2 o 3 , SiO 2 , BaTiO 3 However, due to the characteristics of easy aggregation of inorganic nanoparticles, the mechanical properties of the diaphragm cannot be effectively improved, and even new stress concentration will be brought, which will bring unnecessary loss of mechanical properties to the diaphragm.

Method used

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  • Fluorine-containing resin based membrane reinforced by homogenous fibers modified by oriented fibers
  • Fluorine-containing resin based membrane reinforced by homogenous fibers modified by oriented fibers
  • Fluorine-containing resin based membrane reinforced by homogenous fibers modified by oriented fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0020] PVDF-based glass fiber-reinforced fiber homogeneously reinforced composite diaphragm and its preparation: 1) Electrospinning to prepare nano-reinforced PVDF fibers, solvent acetone / DMF=3 / 7 (v / v), after PVDF is dissolved, add 5% Glass fiber (1μm), after uniform dispersion, the voltage is 18KV, the collection distance is 30cm, the diameter of the runner is 20cm, the rotation speed is 300r / min, the spinning speed is 2ml / h, and the glass fiber reinforced PVDF fiber mat is obtained by drying, with a diameter of 1 ~3μm; 2) Diaphragm preparation, spread the aforementioned fiber mat on the glass surface, spread a PVDF solution with a concentration of 8% (the solvent is DMF) on the surface of the fiber mat by casting, and then dry to obtain PVDF as the substrate The homogeneous fiber-reinforced diaphragm; compared with the PVDF diaphragm without fiber mat reinforcement, the strength is increased from 19MPa to 41MPa;

Embodiment 2

[0022] PTFE-based homogeneous fiber-reinforced diaphragm and its preparation: 1) Teflon fiber mat, wire diameter 10 μm; 2) Diaphragm preparation: add 10% (mass ratio) PI fiber (100nm) to PTFE emulsion, disperse After uniformity, soak the aforementioned fiber felt in the emulsion for 3 minutes. After soaking, take it out and dry it in vacuum to obtain a PTFE-based homogeneous fiber-reinforced diaphragm; compared with the PTFE diaphragm without fiber mat reinforcement, the strength is from 17MPa increased to 40MPa;

Embodiment 3

[0024] PVDF-HFP-based PET fiber-reinforced fiber homogeneously reinforced diaphragm and its preparation: 1) Electrospinning to prepare PET-reinforced PVDF-HFP fibers, solvent acetone / DMF=8 / 2 (v / v), after dissolution, Add 1% PET fiber (200nm), disperse for 3 hours, and then electrospin under the conditions of voltage 23KV, collection distance 30cm, runner diameter 20cm, rotation speed 300r / min, spinning speed 2ml / h, and drying to obtain PET reinforcement. PVDF-HFP fiber mat with a wire diameter of 3~7μm; 2) Preparation of the diaphragm, spread the aforementioned fiber mat on the glass surface, and spread the PVDF-HFP solution with a concentration of 12% (the solvent is acetone) on the fiber mat by casting surface, and then dried to obtain a PVDF-HFP-based homogeneous fiber-reinforced diaphragm; compared with the PVDF-HFP diaphragm without PET reinforced fiber mat, the strength increased from 27MPa to 38.6MPa (such as figure 2 , image 3 shown);

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Abstract

The invention relates to a fluorine-containing resin based membrane reinforced by homogenous fibers modified by oriented fibers. The fluorine-containing resin based membrane is characterized in that the composite membrane comprises the following components: A), a substrate; and B) reinforced fibers, wherein the component A) and the component B) comprise the fluorine-containing resin and the reinforced fibers; the adding proportion mass ratio of the fluorine-containing resin to the reinforced fibers is 99-90 to 1-10; and the reinforced fibers are characterized in that the reinforced fibers are chosen from one or more of glass fibers, polyester fibers or PI fibers. The mechanical strength of the membrane is reinforced by the homogenous fibers modified by oriented fibers; and the mechanical performance of the membrane is strengthened, so that the membrane is particularly suitable for the fields of power battery membranes.

Description

technical field [0001] The invention relates to an orientation-modified fiber homogeneously reinforced fluorine-containing resin-based diaphragm, which is used in the field of power battery diaphragms. Background technique [0002] Fluorine-containing resin-based composite diaphragms such as PVDF, PCTFE, and PTFE have attracted great attention in the field of power battery diaphragms due to their convenient preparation and excellent electrochemical properties. However, the mechanical properties of this type of diaphragm are not satisfactory, and their tensile strength generally does not exceed 20MPa, which limits its application in industry. [0003] The above composite diaphragm can be prepared by phase inversion method, casting method and other processes. In order to improve the mechanical properties of the composite diaphragm, inorganic nanoparticles, such as Al 2 o 3 , SiO 2 , BaTiO 3 However, due to the characteristics of easy aggregation of inorganic nanoparticles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/44
CPCH01M50/446H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 赵中令王丹于力娜韩建曹婷婷常潇然崔新然张克金王猛
Owner CHINA FIRST AUTOMOBILE