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Method for preparing hollow antimony-based binary alloy composite nanofiber material based on electrostatic spinning and potassium storage application of hollow antimony-based binary alloy composite nanofiber material

A composite nanofiber and electrospinning technology, which is applied in the manufacture of conductive/antistatic filaments, electrical components, rayon, etc., can solve the problems of Sb-based material crushing, achieve good cycle life, shorten the process flow, and improve Effect of Market Application Prospects

Active Publication Date: 2020-11-17
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is about 400% volume expansion during the intercalation and deintercalation of potassium ions, which may lead to the pulverization of Sb-based materials.

Method used

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  • Method for preparing hollow antimony-based binary alloy composite nanofiber material based on electrostatic spinning and potassium storage application of hollow antimony-based binary alloy composite nanofiber material
  • Method for preparing hollow antimony-based binary alloy composite nanofiber material based on electrostatic spinning and potassium storage application of hollow antimony-based binary alloy composite nanofiber material
  • Method for preparing hollow antimony-based binary alloy composite nanofiber material based on electrostatic spinning and potassium storage application of hollow antimony-based binary alloy composite nanofiber material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 20 mg of hydroxylated multi-walled carbon nanotubes and dissolve them in 10 ml of DMF to form a black solution after ultrasonication for 3 hours, then add 2 mmol of SbCl to the solution 3 and Ni(CH 3 COO) 2 ・4H 2 After O, stir at room temperature for 4 hours, then add a mixture of 0.7g polyacrylonitrile and 0.3g polymethyl methacrylate, heat at 60°C overnight and stir. The spinning solution was transferred into a 10 ml disposable syringe and then used for electrospinning. The propulsion speed is 50ul min -1 , the working voltage is set to 15KV, collected in aluminum foil, the needle type is 21G, and the distance from the needle to the collector is 18cm. After spinning for 8 hours, the fiber membrane was vacuum-dried overnight at 80° C. to fully evaporate the solvent. After drying, the nanofibrous membrane was exposed to Ar / H 2 In the atmosphere, start with 2 o Cmin -1 speed up to 280 oC Insulate for 3 hours for pre-carbonization to maintain the original s...

Embodiment 2

[0020] The method of the present embodiment is basically the same as that of embodiment 1, the difference is: the Ni(CH 3 COO) 2 ・4H 2 O to SnCl 2 , SnCl 2 and SbCl 3 The molar ratio is also 1:1. The collected samples are SnSb / CNT / PC composite nanofiber materials. Depend on figure 2 As shown in the SEM picture of the nanofiber, the diameter of the nanofiber is 200-300nm, and the surface is very smooth. The SnSb alloy particles are about 50nm, and agglomeration exists. The SnSb alloy particles are in the hollow channels inside the fibers. The presence of CNTs was not observed by SEM images, because the CNTs were well confined inside the carbon nanofibers.

Embodiment 3

[0022] The method of the present embodiment is basically the same as that of embodiment 1, the difference is: the Ni(CH 3 COO) 2 ・4H 2 O to CoCl 2 , CoCl 2 and SbCl 3 The molar ratio is also 1:1. The collected samples are CoSb / CNT / PC composite nanofiber materials. Depend on image 3 As shown in the SEM picture of the nanofiber, the diameter of the nanofiber is several hundred nanometers, and the diameter of the CoSb nanoparticle is several nanometers. It can be clearly seen that the CoSb nanoparticle is evenly distributed on the inner and outer surfaces of the carbon fiber, and it can be seen that the interior of the fiber is a hollow structure. This is because PMMA is produced by pyrolysis during calcination. The CNTs are exposed outside the hollow channels, forming a well-conducting network.

[0023] The crystal structure of the XSb (X=Ni, Sn, Co) / CNT / PC composite nanofiber material of the present invention is characterized by using XRD technology as Figure 4 shown...

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Abstract

The invention discloses a method for preparing a hollow antimony-based binary alloy composite nanofiber material based on electrostatic spinning and potassium storage application of the hollow antimony-based binary alloy composite nanofiber material. According to the method, PAN and PMMA are taken as precursors, after antimony trichloride, CNT, nickel acetate, stannous chloride and cobalt chlorideare dissolved into DMF according to a certain proportion to form a spinning solution, the spinning solution is transferred into a disposable injector, electrostatic spinning is carried out in electrostatic spinning equipment, and a nanofiber membrane is obtained. After vacuum drying, the fiber membrane is put into a tubular furnace, the temperature is increased to 230-300 DEG C at a low temperature increase rate, heat preservation is carried out for a certain time, pre-carbonization is carried out, then the temperature is increased to 600-800 DEG C at a large temperature increase rate, carbonization is carried out, and a sample obtained after carbonization is marked as XSb (X = Ni, Sn, Co) / CNT / PC. A carbon framework provides a three-dimensional conductive network, the PMMA is pyrolyzed togenerate a hollow channel, alloy particles are embedded in the inner and outer surfaces of carbon fibers, by means of the CNT, the overall conductivity of the material is improved in the carbon fibers, and therefore the material shows excellent comprehensive electrochemical performance when used as a potassium ion battery electrode material.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage materials, and provides a method for preparing a hollow antimony-based binary alloy composite nanofiber material based on electrospinning, and an application in negative electrode materials of potassium ion batteries. Background technique [0002] Energy is an important material basis for the progress of human civilization. With the depletion of non-renewable energy such as oil, people have been exploring alternative renewable energy. In recent years, lithium-ion batteries have developed rapidly, and research on electrode materials for lithium-ion batteries has achieved fruitful results. Lithium-ion batteries have been developed commercially, but the storage of lithium resources in the earth's crust is very limited, and the distribution is uneven globally. Therefore, the application of lithium-ion energy storage devices in large-scale energy storage is limited. The chemical properti...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F9/21D01F1/08D01F1/09D01F1/10H01M4/36H01M4/38H01M4/62H01M10/054
CPCD01F9/22D01F9/21D01F1/08D01F1/09D01F1/10H01M4/362H01M4/38H01M4/625H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 柳伟周峻安高翔
Owner OCEAN UNIV OF CHINA
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