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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there have been no literature reports and invention/utility patents on the application of electrosp

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

Examples

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Example Embodiment

[0026] Example 1

[0027] Add the prepared homogeneous sol solution of 2.25ml tin tetrachloride and 10mL ethylene glycol to 20mL polyacrylonitrile NN dimethylformamide solution (concentration of 10wt%), and then stir under the ultrasonic wave until uniform The solution is used for electrospinning. In the electrospinning process, a No. 12 injection needle (with an inner diameter of 1.1mm) is selected, the applied electrostatic voltage is 14kV, the spinning solution flow is 0.4mL / h, the receiving distance between the metal drum and the needle is 20cm, and the drum outer diameter The linear speed is 4m / s, after 6h of spinning, a certain thickness of partially oriented nanofiber mat / membrane is obtained. The resulting electrospun nanofiber felt / membrane was kept at 120°C for 4 hours, and then pre-oxidized at 220°C for 4 hours. Finally, place the pre-oxidized fiber in a carbonization furnace at 850°C and under the protection of nitrogen for 1 hour, at a heating rate of 1°C / min, and ...

Example Embodiment

[0028] Example 2

[0029] Add the prepared homogeneous sol solution of 2.25ml tin tetrachloride and 10ml ethylene glycol to 20ml polyacrylonitrile NN dimethylformamide solution (concentration of 11wt%), and then stir under ultrasonic until it forms The homogeneous solution is used for electrospinning. In the electrospinning process, a No. 12 injection needle (with an inner diameter of 1.1mm) is selected, the applied electrostatic voltage is 16kV, the spinning solution flow rate is 0.4mL / h, the receiving distance between the metal drum and the needle is 15cm, and the drum outer diameter The linear speed is 4m / s, after 6h of spinning, a certain thickness of partially oriented nanofiber mat / membrane is obtained. The resulting electrospun nanofiber felt / membrane was pre-oxidized at 270°C for 3h. Finally, place the pre-oxidized fiber in a carbonization furnace at 1000°C and under the protection of nitrogen for 1 hour, at a heating rate of 1°C / min, and take it out at a cooling rate o...

Example Embodiment

[0030] Example 3

[0031] Add the prepared uniform sol solution of 1.75ml tin tetrachloride and 15ml anhydrous acetic acid to 20ml polyvinylpyrrolidone in dimethylacetamide solution (concentration of 12wt%), and then stir under ultrasonic until uniform The solution is used for electrospinning. In the electrospinning process, a 12-gauge injection needle (with an inner diameter of 1.1mm) is selected, the applied electrostatic voltage is 17kV, the spinning solution flow rate is 0.3mL / h, the receiving distance between the metal drum and the needle is 15cm, and the drum outer diameter The linear speed is 4m / s. After 6h of spinning, a certain thickness of partially oriented nanofiber mat / membrane is obtained, and then the fiber mat / membrane is fired in a carbonization furnace for 2h under the protection of argon at 700℃. The temperature is 10℃ / min, and the tin / carbon nanofiber composite film material can be obtained by cooling at a cooling rate of 5℃ / min. The particle size of tin is a...

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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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