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In-situ inorganic-organic composite spinning diaphragm as well as preparation method and application thereof

A composite spinning and membrane technology, which is applied in the field of in-situ inorganic-organic composite spinning membrane and its preparation, can solve the problems of difficult to achieve orderly regulation of ions and improvement of electrochemical performance, and achieve long-term storage performance and ionic conductivity. Effect of high and excellent physical properties and electrochemical performance

Inactive Publication Date: 2021-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, based on the above methods, we can easily find that the existing forms of organic polymers and inorganic nanomaterials have great contingency, such as inorganic materials mainly attached to the bulk phase of spinning nanowires or / and the surface of inorganic materials, forming a disordered state of inorganic materials. Agglomeration or stacking has limited influence on the radial transport of ions, and it is difficult to achieve orderly regulation of ions and improvement of electrochemical performance

Method used

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  • In-situ inorganic-organic composite spinning diaphragm as well as preparation method and application thereof
  • In-situ inorganic-organic composite spinning diaphragm as well as preparation method and application thereof
  • In-situ inorganic-organic composite spinning diaphragm as well as preparation method and application thereof

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preparation example Construction

[0041] see figure 1 , is a schematic diagram of the preparation process of the in-situ inorganic-organic composite spinning membrane of the present invention. The preparation method of the in-situ organic-inorganic composite spinning diaphragm of the present invention comprises the following steps:

[0042] Step S1, using an electrospinning process to fabricate a spinning diaphragm on the surface of the spinning receiver;

[0043] Specifically, the electrospinning process includes the following steps:

[0044] A certain amount of polymer material is dissolved in an organic solvent as a spinning solute, heated and stirred to form a translucent spinning solution without air bubbles, and the mass fraction of the spinning solution is 5-30wt%; wherein, the organic solvent is selected from N , one or more of N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, sulfolane; the polymer material is selected from polyvinylidene fluoride, polyacrylonitrile, polyylidene One ...

Embodiment 1

[0056] Dissolving the polyacrylonitrile powder in the DMF solvent as the solute of the spinning solution to prepare a 20 wt% PAN polymer spinning solution until the solution is uniform and transparent to obtain a pure PAN spinning solution;

[0057] Adjust the negative high voltage of the electrospinning machine to -2.3kV, the positive high voltage to 9.8kV, and the injection speed to 0.02mm min -1 , spinning receiver speed is 60mm·min -1 , making a spinning diaphragm on the surface of the spinning receiver;

[0058] On the other side of the spinning receiver, a kaolin clay solution with a mass fraction of 5% is arranged, and the single-layer or nearly single-layer clay is attached to the spinning diaphragm in situ through the rotation of the rotating shaft, and then treated by a heater at 80°C. Continue the spinning diaphragm-inorganic clay attachment-drying cycle process to obtain a sandwich organic-inorganic composite spinning diaphragm;

[0059] The composite spinning me...

Embodiment 2

[0063] Polyvinylidene fluoride (PVDF) powder is prepared as a spinning solution solute to obtain a 5wt% polymer spinning solution; the PVDF solution is placed in a magnetic stirrer and stirred until the solution is uniform and translucent to obtain a spinning solution;

[0064] Adjust the electrospinning to adjust the negative high voltage to -1.3kV, the positive high voltage to 4.7kV, and the injection speed to 0.05mm min -1 , other parameters are identical with embodiment 1, and wherein clay material is montmorillonite;

[0065] After spinning, the composite spinning diaphragm was removed from the receiver and placed in a vacuum drying oven to dry. The prepared polyvinylidene fluoride-montmorillonite organic-inorganic composite spinning diaphragm had a thickness of 70 μm and a nanofiber diameter of 50-100nm.

[0066] Composite spinning diaphragm, zinc sheet, ammonium vanadate positive electrode sheet and 2mol / L zinc sulfate electrolyte were assembled into a button battery, ...

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Abstract

The invention provides a preparation method of an in-situ organic-inorganic composite spinning diaphragm. The preparation method comprises the following steps: manufacturing a spinning diaphragm on the surface of a spinning receiver by adopting an electrostatic spinning process; preparing an inorganic clay solution, and enabling the inorganic clay to be attached to the spinning diaphragm in situ under the electrostatic and spin-coating action to form a first composite layer; heating and drying the first composite layer; re-manufacturing a spinning diaphragm on the surface of the first composite layer by adopting an electrostatic spinning process; repeating the steps S2-S3 to form a second composite layer bonded with the first composite layer; and repeating the steps to prepare the composite spinning diaphragm with the inorganic-organic sandwich structure. According to the in-situ inorganic-organic composite spinning diaphragm and the preparation method thereof provided by the invention, the problems of disordered agglomeration, random stacking and the like of inorganic nano materials can be avoided, and maximum functionalization of diaphragm material modification by inorganic materials is realized. The invention also provides an application of the in-situ organic-inorganic composite spinning diaphragm in a lithium ion battery, a zinc ion battery, a lead-acid battery or an aluminum ion battery.

Description

technical field [0001] The invention relates to the technical field of battery diaphragms, in particular to an in-situ inorganic-organic composite spinning diaphragm and its preparation method and application. Background technique [0002] As a new type of secondary battery energy storage system, aqueous zinc-based batteries based on high safety, low cost, and green environmental protection have attracted extensive attention from researchers all over the world, and are considered to be the most attractive storage options for lithium-ion batteries. can replace the system. In addition to the advantages of electrochemical and intrinsic safety, zinc is rich in reserves, environmentally friendly, and its price is less than one-third of copper and about one-twentieth of metal lithium. [0003] Currently such as Zn-MnO 2 Substantial progress has been made in the research of rechargeable Zn-ion batteries. However, compared with more mature cathode materials and metal zinc anodes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/449H01M10/36
CPCH01M10/36Y02E60/10
Inventor 周江解雪松方芸
Owner CENT SOUTH UNIV
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