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Preparation method of tin/carbon composite nano fiber film cathode material

A technology of composite nanofiber and thin film materials, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of poor cycle performance and complicated process of composite materials, and achieve improved diffusion behavior, increased specific capacity, and less material consumption Effect

Inactive Publication Date: 2010-10-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many methods for compounding metal tin and carbon materials, such as ball milling method, template method, in-situ growth method, etc., but some of these methods are complex in process, such as template method, and some composite materials are poor in cycle performance, such as ball milling law, wait

Method used

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  • Preparation method of tin/carbon composite nano fiber film cathode material
  • Preparation method of tin/carbon composite nano fiber film cathode material
  • Preparation method of tin/carbon composite nano fiber film cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Dissolve 2g of polyacrylonitrile in a certain amount of nitrogen, nitrogen-dimethylformamide (concentration is 7wt%), drop a certain amount of anhydrous tin tetrachloride into 10ml ethanol (concentration is 0.4mol / L), and ultrasonically stir 24 hours; Take 1ml of ethanol solution dissolved with anhydrous tin tetrachloride and drop it into the nitrogen dissolved in polyacrylonitrile, nitrogen-dimethylformamide, and ultrasonically stir for 12 hours; use the obtained liquid to carry out electrospinning, electrostatic spinning In the spinning process, a No. 12 injection needle (1.1 mm in inner diameter) was selected, the applied electrostatic voltage was 9 kV, the flow rate of the spinning solution was 0.2 mL / h, the receiving distance between the metal cylinder and the needle was 30 cm, and the speed of the outer diameter of the cylinder was 8m / s, the nanofiber felt / membrane was obtained after spinning for 6 hours. The obtained electrospun nanofiber mat / membrane was kept at...

Embodiment 2

[0033]Dissolve 2g of polyacrylonitrile in a certain amount of nitrogen, nitrogen-dimethylacetamide (concentration is 12wt%), get a certain amount of crystalline tin tetrachloride and dissolve it in 13ml acetone (concentration is 1mol / L), and process it with ultrasonic stirring for 24 hours Get 1ml of the acetone solution that is dissolved with crystalline tin tetrachloride, drop into the nitrogen that has dissolved polyacrylonitrile, in the nitrogen-dimethylformamide, ultrasonic agitation process 12 hours; Carry out electrospinning with the liquid obtained, electrospinning In the spinning process, a No. 16 injection needle (inner diameter of 1.6mm) was selected, the applied electrostatic voltage was 15kV, the flow rate of spinning solution was 0.5mL / h, the receiving distance between the metal cylinder and the needle was 25cm, and the speed of the outer diameter of the cylinder was 4m. / s, the nanofiber mat / membrane was obtained after 6 hours of spinning. The obtained electrosp...

Embodiment 3

[0035] Dissolve 2g of polyvinylpyrrolidone in a certain amount of nitrogen, nitrogen-dimethylacetamide (concentration is 15wt%), take a certain amount of tetrabutyltin dropwise into 10ml of anhydrous acetic acid (concentration is 1.6mol / L), ultrasonic stirring treatment for 24 hours Get 1ml of anhydrous acetic acid solution that is dissolved with tetrabutyltin, drop into the nitrogen that has dissolved polyvinylpyrrolidone, in the nitrogen-dimethylformamide, ultrasonic agitation process 12 hours; Carry out electrospinning with the liquid that obtains, electrospinning In the process, a No. 20 injection needle (with an inner diameter of 2.0mm) was selected, the applied electrostatic voltage was 16kV, the flow rate of the spinning solution was 1.0mL / h, the receiving distance between the metal cylinder and the needle was 20cm, and the speed of the outer diameter of the cylinder was 4m / h. s, Nanofiber mat / membrane obtained after 6 hours of spinning. The obtained electrospun nanofib...

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Abstract

The invention discloses a preparation method of a tin / carbon composite nano fiber film cathode material. In the method, a tin-doped carbon-based nano fiber film obtained by an electrostatic spinning method is thermally drawn in a certain temperature range at a drawing rate of 5-60%, and is sequentially preoxidated and carburized to ultimately obtain the required cathode material. After the thermal drawing, the electrochemical performance of the tin / carbon composite film material is obviously improved, the specific capacity and the cycle performance of a battery are effectively enhanced, and the coulomb efficiency is more than 90% after 30 cycles. Besides, the method also has the advantages of simple and feasible operation, easy process control, moderate condition and the like.

Description

technical field [0001] The present invention designs a method for preparing a tin-carbon composite nanofiber film negative electrode material, more precisely, it designs a tin-carbon composite nanofiber that can be used as a negative electrode of a rechargeable lithium-ion battery, and has high specific capacity and stable cycle performance. Thin film material and its preparation method. Background technique [0002] Lithium-ion secondary batteries have become the preferred power source for various electronic products due to their high voltage, high specific energy, long life, and low pollution. Therefore, they have also become one of the hot spots in the research and development of new secondary chemical power sources. To improve the performance and capacity of lithium-ion batteries, it is necessary to continuously develop better key materials for batteries, and the negative electrode material is a key factor. Its mainstream direction focuses on carbon materials, tin-based...

Claims

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Application Information

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IPC IPC(8): H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 于运花常洁刘丙学杨小平
Owner BEIJING UNIV OF CHEM TECH
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