Preparation for anode material of tin-cobalt alloy/carbon nanofiber film lithium ion battery

A technology of carbon nanofibers and lithium-ion batteries, applied in battery electrodes, nanotechnology, nanotechnology, etc., to achieve the effects of increasing conductivity, high specific capacity, and buffering volume changes

Inactive Publication Date: 2012-10-24
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation for anode material of tin-cobalt alloy/carbon nanofiber film lithium ion battery
  • Preparation for anode material of tin-cobalt alloy/carbon nanofiber film lithium ion battery
  • Preparation for anode material of tin-cobalt alloy/carbon nanofiber film lithium ion battery

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Embodiment 1

[0019] Weigh 0.314g cobalt acetate tetrahydrate and 0.504g stannous octoate (molar ratio 1:1) and dissolve in N,N-dimethylformamide solution with polyacrylonitrile mass volume concentration of 0.07g / mL, and stir in a water bath until A homogeneous solution is used for electrospinning. Electrospinning uses a 0.6mm inner diameter needle, voltage 8kV, injection speed 0.4mL / min, electrospinning for 6 hours, pre-oxidation heating rate 1°C / min, pre-oxidation at 280°C for 1.5 hours, carbonization heating rate 1°C / min, in Carbonization at 850°C for 1 hour in a high-purity nitrogen atmosphere. The tin-cobalt alloy / carbon nanofiber composite film material can be obtained. The film has good flexibility and can be cut into an appropriate shape and directly used as the negative electrode material of the lithium-ion battery for battery testing.

[0020] In this thin film, the tin-cobalt alloy forms a CoSn-type alloy with a tin content of 25wt%, and the specific capacity remains at 440 mAh...

Embodiment 2

[0022] Weigh 0.367g of cobalt nitrate and 0.219g of tin chloride (molar ratio 3:2) and dissolve in N,N-dimethylformamide solution with a mass volume concentration of polyacrylonitrile of 0.10g / mL, stir in a water bath until uniform The solution is used for electrospinning. Electrospinning uses a 0.8mm inner diameter needle, voltage 10kV, injection speed 0.6mL / min, electrospinning for 6 hours, pre-oxidation heating rate 3°C / min, pre-oxidation at 280°C for 1 hour, carbonization heating rate 3°C / min, in Carbonization in high-purity nitrogen atmosphere at 700°C for 1.5 hours. The tin-cobalt alloy / carbon nanofiber composite film material can be obtained. The film has good flexibility and can be cut into an appropriate shape and directly used as the negative electrode material of the lithium-ion battery for battery testing.

[0023] In this thin film, the tin-cobalt alloy forms a Co3Sn2 type alloy, and the capacity remains at 320 mAh / g after 40 cycles.

Embodiment 3

[0025] Weigh 0.300g of cobalt chloride and 0.560g of stannous chloride (molar ratio 1:2) and dissolve in N,N-dimethylformamide solution with a mass volume concentration of polyacrylonitrile of 0.12g / mL, and stir in a water bath until A homogeneous solution is used for electrospinning. Electrospinning uses a 1.0 mm inner diameter needle, voltage 12kV, injection speed 0.8mL / min, electrospinning for 6 hours, pre-oxidation heating rate 5°C / min, pre-oxidation at 280°C for 1.5 hours, carbonization heating rate 10°C / min, in Carbonization in high-purity nitrogen atmosphere at 1000°C for 2 hours. The film has good flexibility and can be cut into an appropriate shape and directly used as the negative electrode material of the lithium-ion battery for battery testing.

[0026] In this thin film, the tin-cobalt alloy forms a CoSn2 type alloy, and the capacity remains at 450 mAh / g after 40 cycles.

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Abstract

The invention discloses a preparation method for anode material of tin-cobalt alloy/carbon nanofiber film lithium ion battery. The method process comprises a first step of preparing a polymer nanofiber film via electrostatic spinning with proper electrostatic spinning parameters by a uniform electrostatic spinning solution which is formed by employing stannous octoate as a tin precursor, cobalt acetate as a cobalt precursor, polyacrylonitrile as a carbon nanofiber precursor and an organic solvent; and a second step of preparing the tin-cobalt alloy/carbon nanofiber film by using a pre-oxidation treatment and a carbonization treatment. The tin-cobalt alloy/carbon nanofiber composite film prepared by the method effectively improves specific capacity and cycle performance of the anode material of the lithium ion battery, because tin-cobalt alloy particles are uniformly dispersed in the carbon nanofibers with uniform diameters; cobalt metal component increases conductivity of the material and can buffer volume change to a certain degree when the tin metal is charged and discharged; and simultaneously the carbon fibers can further play a role for buffering the volume change of the materials.

Description

technical field [0001] The invention relates to a preparation method of a tin-cobalt alloy / carbon nanofiber thin film lithium ion battery negative electrode material, which belongs to the lithium ion battery negative electrode material preparation technology. Background technique [0002] Lithium-ion batteries are more and more widely used in portable electronic devices such as notebook computers, mobile phones, and digital cameras because of their high voltage, high specific capacity, long cycle life, no memory effect, and small self-discharge. With the rapid development of transportation, information and communication industries, higher and higher requirements are placed on the specific energy density and cycle life of lithium-ion batteries. Anode materials have always been one of the key factors to improve the reversible capacity and cycle life of lithium-ion batteries. At present, commercial lithium-ion batteries mostly use graphite as the negative electrode material, bu...

Claims

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Application Information

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IPC IPC(8): H01M4/38B82Y30/00D01D5/00D04H1/728D06C7/04
CPCY02E60/12Y02E60/10
Inventor 袁晓燕芦伟立罗程皞
Owner TIANJIN UNIV
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