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Porous carbon nanofiber anode material for lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and nanofibers, which is applied in the field of nanomaterials and chemical power sources, can solve the problems of low initial cycle efficiency, poor cycle stability, and poor rapid charge and discharge capabilities, achieve high initial discharge capacity and cycle stability, and improve Effect of high power characteristics, improvement of first-cycle efficiency and cycle stability

Inactive Publication Date: 2011-05-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of low initial cycle efficiency, poor cycle stability and rapid charge and discharge ability when the above-mentioned carbon nanofiber is used as the negative electrode material of lithium ion battery, and provide a kind of porous carbon nanofiber negative electrode material for lithium ion battery and its preparation method ; It is required to improve the first cycle efficiency and rapid charge and discharge capacity, and at the same time, the method has low processing cost, simple and easy control process, short cycle, high efficiency and energy saving, and is convenient for further expansion of production

Method used

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  • Porous carbon nanofiber anode material for lithium ion battery and preparation method thereof
  • Porous carbon nanofiber anode material for lithium ion battery and preparation method thereof
  • Porous carbon nanofiber anode material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Weigh PAN 1.8g, PMMA 0.2g (PAN / PMMA=9:1); PAN 1.4g, PMMA 0.6g (PAN / PMMA=7:3); PAN, PMMA each 1g (PAN / PMMA=5:5 ), and then added to three parts of 23ml DMF solution respectively, and stirred with a glass rod for about 20min until completely uniform swelling. Then the mixed solution was transferred to a 50ml Erlenmeyer flask, put into a magnetic rotor, adjusted to an appropriate rotational speed, and stirred at room temperature for 24 hours. The above-mentioned spinning solution prepared is put into self-made spinning equipment, under the process conditions of spinning voltage 10kV, collecting distance 8cm, solution extrusion speed 0.3ml / h, spinning for 10 hours, then drying in a vacuum oven for 2 hours, the PAN / PMMA nanofiber membrane was obtained. The above PAN / PMMA nanofiber membrane was transferred into a high-temperature tube furnace, heated from room temperature to 230 °C at a heating rate of 2 °C / min, and then pre-oxidized at 230 °C for 1 h. Pass inert gas N 2 P...

Embodiment 2

[0021] Weigh PAN 1.8g, PMMA 0.2g (PAN / PMMA=9:1); PAN 1.4g, PMMA 0.6g (PAN / PMMA=7:3); PAN, PMMA each 1g (PAN / PMMA=5:5 ), and then added to three parts of 23ml DMF solution respectively, and stirred with a glass rod for about 20min until completely uniform swelling. Then the mixed solution was transferred to a 50ml Erlenmeyer flask, put into a magnetic rotor, adjusted to an appropriate rotational speed, and stirred at room temperature for 24 hours. The above-mentioned spinning solution prepared is put into self-made spinning equipment, under the process conditions of spinning voltage 10kV, collecting distance 12cm, solution extrusion speed 0.5ml / h, spinning for 10 hours, then drying in a vacuum oven for 2 hours, the PAN / PMMA nanofiber membrane was obtained. The above PAN / PMMA nanofiber membrane was transferred into a high-temperature tube furnace, heated from room temperature to 250 °C at a heating rate of 2 °C / min, and then pre-oxidized at 250 °C for 1 h. Pass inert gas N 2 ...

Embodiment 3

[0023] Weigh PAN 1.8g, PMMA 0.2g (PAN / PMMA=9:1); PAN 1.4g, PMMA 0.6g (PAN / PMMA=7:3); PAN, PMMA each 1g (PAN / PMMA=5:5 ), and then added to three parts of 23ml DMF solution respectively, and stirred with a glass rod for about 20min until completely uniform swelling. Then the mixed solution was transferred to a 50ml Erlenmeyer flask, put into a magnetic rotor, adjusted to an appropriate rotational speed, and stirred at room temperature for 24 hours. The above-mentioned spinning solution prepared is put into self-made spinning equipment, under the process conditions of spinning voltage 12kV, collection distance 15cm, solution extrusion speed 1.0ml / h, spinning for 10 hours, then drying in a vacuum oven for 2 hours, the PAN / PMMA nanofiber membrane was obtained. The above PAN / PMMA nanofiber membrane was transferred into a high-temperature tube furnace, heated from room temperature to 250 °C at a heating rate of 2 °C / min, and then pre-oxidized at 250 °C for 1 h. Pass inert gas N 2 ...

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Abstract

The invention provides a porous carbon nanofiber anode material for a lithium ion battery and a preparation method thereof, belonging to the technical field of nanometer materials and chemical power sources. The material is a carbon nanofiber material with a porous structure, which is provided with larger specific surface. The preparation method comprises the following steps: firstly using an electrostatic spinning technology to prepare composite nanofiber; and then carrying out pre-oxidation and carbonization to obtain the porous carbon nanofiber. The preparation method is simple, is easy to control, and has the advantage of low production cost. The material taken as an electrode material for a lithium ion battery anode provided by the invention has higher initial discharge capacity and cyclical stability, thus improving the high power characteristics and the fast charge-discharge capacity of the anode material, and meeting development requirements on a lithium ion power battery for an electric vehicle.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and chemical power sources, and in particular relates to a lithium ion battery nano negative electrode material and a preparation method, in particular to a lithium ion battery porous carbon nanofiber negative electrode material and a preparation method. Background technique [0002] In recent years, lithium-ion batteries have been widely used as energy storage systems due to their excellent properties such as high specific energy, long cycle life, and low self-discharge rate. With the advancement of the electronics industry, electric vehicles and aerospace technology, higher requirements are placed on the performance of lithium-ion batteries that provide energy for them. Existing battery system (negative electrode is carbon material, positive electrode is LiCoO 2 ) The volume specific energy is close to its limit value of 500Wh / L (the utilization rate of the internal space of the bat...

Claims

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Application Information

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IPC IPC(8): H01M4/1393B82Y40/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 乔辉魏取福黄锋林李静
Owner JIANGNAN UNIV
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