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Stannum and carbon composite nano-fiber film negative-electrode material and preparation method thereof

A technology of carbon nanofibers and carbon-based nanofibers, which is applied in the field of new energy storage materials, can solve the problems such as literature reports and invention/practical patents of tin/carbon nanofiber composite film materials for lithium-ion battery negative electrodes, and achieve excellent results. Discharge performance and charge-discharge cycle stability, improved performance, simple configuration process

Active Publication Date: 2010-01-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no literature reports and invention / utility patents on the application of electrospinning to prepare tin / carbon nanofiber composite film materials for lithium-ion battery negative electrodes

Method used

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  • Stannum and carbon composite nano-fiber film negative-electrode material and preparation method thereof
  • Stannum and carbon composite nano-fiber film negative-electrode material and preparation method thereof
  • Stannum and carbon composite nano-fiber film negative-electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Add the homogeneous sol solution of 2.25ml of tin tetrachloride and 10mL of ethylene glycol into 20mL of polyacrylonitrile N-N dimethylformamide solution (concentration is 10wt%), and then stir under ultrasonic until a uniform solution is formed. solution for electrospinning. During the electrospinning process, a No. 12 injection needle (inner diameter of 1.1mm) was selected, the applied electrostatic voltage was 14kV, the flow rate of the spinning solution was 0.4mL / h, the receiving distance between the metal cylinder and the needle was 20cm, and the outer diameter of the cylinder was The line speed is 4m / s, and after 6 hours of spinning, a nanofiber mat / membrane with a certain thickness and partially parallel orientation is obtained. The resulting electrospun nanofiber mat / membrane was incubated at 120 °C for 4 h, and then pre-oxidized at 220 °C for 4 h. Finally, put the pre-oxidized fiber in a carbonization furnace and bake it under the protection of nitrogen at 850...

Embodiment 2

[0029] Add the homogeneous sol solution of 2.25ml tin tetrachloride and 10mL ethylene glycol into 20mL polyacrylonitrile N-N dimethylformamide solution (concentration is 11wt%), then stir under ultrasonic until forming A homogeneous solution is used for electrospinning. During the electrospinning process, a No. 12 injection needle (inner diameter of 1.1mm) was selected, the applied electrostatic voltage was 16kV, the flow rate of the spinning solution was 0.4mL / h, the receiving distance between the metal cylinder and the needle was 15cm, and the outer diameter of the cylinder was The line speed is 4m / s, and after 6 hours of spinning, a nanofiber mat / membrane with a certain thickness and partially parallel orientation is obtained. The resulting electrospun nanofiber mat / membrane was pre-oxidized at 270°C for 3 h. Finally, place the pre-oxidized fibers in a carbonization furnace and roast them for 1 hour at 1000°C under the protection of nitrogen, with a heating rate of 1°C / min...

Embodiment 3

[0031] Add the uniform sol solution of 1.75ml of tin tetrachloride and 15mL of anhydrous acetic acid into 20mL of polyvinylpyrrolidone in dimethylacetamide solution (concentration is 12wt%), then under ultrasonic stirring until a uniform solution for electrospinning. During the electrospinning process, a No. 12 injection needle (inner diameter of 1.1mm) was selected, the applied electrostatic voltage was 17kV, the flow rate of the spinning solution was 0.3mL / h, the receiving distance between the metal cylinder and the needle was 15cm, and the outer diameter of the cylinder was The line speed is 4m / s, after 6 hours of spinning, a certain thickness of partially parallel-oriented nanofiber mat / film is obtained, and then the fiber mat / film is placed in a carbonization furnace and roasted for 2 hours under the protection of argon at 700°C. The temperature is 10°C / min, and the tin / carbon nanofiber composite film material can be obtained by cooling at a cooling rate of 5°C / min, where...

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Abstract

The invention relates to stannum / carbon nano-fiber composite film material used in the negative electrode of a lithium ion battery and a preparation method thereof and also provides an assembly method of the stannum / carbon nano-fiber composite film material generated according to the preparation method and used as the electrode of the lithium ion battery. The preparation method comprises the following steps: preparing an uniform spinning solution by mixing a stannum precursor compound, a solvent, a precursor polymer of carbon nano-fibers and an organic solvent together; obtaining a polymer nano-fiber film by electro spinning according to a suitable electrostatic spinning technology; and obtaining a stannum / carbon nano-fiber composite film used in the negative electrode of the lithium ion battery through final treatment technologies, such as preoxidation, carbonization, and the like, thereby effectively collaborating the electrochemical performance of stannum / carbon nano-fibers and improving the specific capacity, the first charge-discharge efficiency and the cycle performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a tin / carbon nanofiber composite film material and a preparation method for a negative electrode of a lithium ion battery, and belongs to the field of new energy storage materials. Background technique [0002] Lithium-ion batteries have high voltage (the working voltage of general lithium-ion batteries is about 3.6V), small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge (monthly self-discharge rate is less than 10%), Long life and other advantages have been widely used in portable electronic and electrical power sources, such as mobile phone batteries, digital electrical appliances batteries and other traditional applications. With the rapid development of industries such as aerospace, transportation, communication and information, high-tech fields such as aerospace space technology, microelectronic equipment for national defense, electric vehicles, mobile communication products,...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/04
CPCY02E60/12Y02E60/10
Inventor 于运花杨青杨小平
Owner BEIJING UNIV OF CHEM TECH
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