Method for preparing carbon hollow ball super-fine powder for negative pole of lithium ion battery by waste plastics at low temperature

A technology of lithium-ion batteries and carbon hollow spheres, applied in battery electrodes, carbon preparation/purification, circuits, etc., to achieve the effects of recycling waste, low reaction temperature, and environmental pollution control

Inactive Publication Date: 2014-05-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using these waste plastics as raw materials to synthesize carbon hollow sphere superfine powder is beneficial to energy saving, consumption reduction and raw material cost reduction, and so far there has been no report in this regard

Method used

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  • Method for preparing carbon hollow ball super-fine powder for negative pole of lithium ion battery by waste plastics at low temperature
  • Method for preparing carbon hollow ball super-fine powder for negative pole of lithium ion battery by waste plastics at low temperature
  • Method for preparing carbon hollow ball super-fine powder for negative pole of lithium ion battery by waste plastics at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: the low-temperature synthesis method of carbon hollow sphere ultrafine powder

[0044] Take 0.05mol HDPE (according to elemental carbon) plastic waste, 0.1mol metal sodium, 0.04mol metal magnesium powder (200 mesh) and 0.03mol sulfur powder, and put them into a stainless steel reactor (the volume of the reactor is 20ml), Seal it and place it in a resistance furnace, and react for 8 hours at 400°C (furnace temperature controlled at ±5°C) and 1 to 3 MPa; after stopping heating, cool the reaction kettle to room temperature naturally; % ethanol, 1mol / L hydrochloric acid, washed with water until the pH is neutral, centrifuged and vacuum-dried at 50°C for 6 hours to obtain a black powder product, that is, carbon hollow sphere superfine powder.

[0045]Cu Kα rays (wavelength The scanning step speed is 0.08° / sec) to analyze the product crop phase, and its main component is carbon. like figure 1 shown.

[0046] The morphology of the product was observed using ...

Embodiment 2

[0050] Embodiment 2: Low-temperature synthesis of carbon hollow sphere ultrafine powder

[0051] As described in Example 1, the difference is that the waste plastics in the raw materials are (calculated by simple carbon) 0.05mol LDPE plastic waste (shopping bags or garbage bags for supermarkets). It was synthesized at 400°C for 8 hours. The electrochemical performance characterization method is the same as in Example 1.

[0052] Figure 5 It is a low magnification TEM photo of the product obtained in this example after purification. The product contains a large amount of carbon hollow spheres with a diameter of about 150 nanometers and a wall thickness of about 20 nanometers. At the same time, the product contains a small amount of solid carbon spheres and carbon nanotubes, and the yield of carbon products is about 40%.

Embodiment 3

[0053] Embodiment 3: the low-temperature synthesis of carbon hollow sphere ultrafine powder

[0054] As described in Example 1, the difference is that the waste plastic in the raw material is 1g of PET plastic waste (mineral water bottle or beverage bottle). It was synthesized at 380°C for 10 hours. The electrochemical performance characterization method is the same as in Example 1.

[0055] Image 6 It is a low magnification TEM photo of the product obtained in this example. The product is mainly carbon hollow spheres with a diameter of about 170 nanometers and a wall thickness of about 25 nanometers. At the same time, the product contains some small particles and carbon nanotubes, and the yield of carbon products is about 42%.

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Abstract

The invention relates to a method for preparing carbon hollow ball super-fine powder for a negative pole of a lithium ion battery by waste plastics at low temperature, which comprises the steps of: mixing the waste plastics with Na, Mg powder and S powder in proportion, and carrying out reaction in an autoclave for 5-10h under the conditions of 300-480 DEG C and 0.5-6MPa; and washing the product by alcohol, water and hydrochloric acid and drying to obtain the carbon hollow ball super-fine powder which has the hollow ball diameter of 50-300 nanometers and the hollow ball wall thickness of 20-30 nanometers. The carbon hollow ball super-fine powder has excellent electrochemical performance as the negative pole material of the lithium ion battery; the method is low in needed reaction temperature, simple and convenient in operation and beneficial to industrialization, and especially the waste plastics are taken as carbon source so as to be beneficial to saving energy, reducing consumption and lowering the material cost; furthermore, waste resource utilization and environmental pollution control can be realized.

Description

technical field [0001] The invention relates to a method for preparing ultrafine carbon hollow sphere powder for lithium ion battery negative poles by using waste plastics at low temperature. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, and fast charging. However, with the advancement of technology, people have higher requirements for the capacity and power of lithium ions. Requirements, traditional carbon materials have gradually failed to meet people's needs. Therefore, exploring new, safe and efficient carbon-based nano-electrode materials is an inevitable requirement for the development of lithium-ion batteries. Both carbon hollow spheres and carbon nanotubes are allotropic forms of carbon. Carbon hollow spheres are useful in the preparation of diamond films, catalytic materials, special rubber additives, and especially as ano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02B82Y40/00H01M4/587C01B32/05C01B32/15
CPCY02E60/12Y02E60/10
Inventor 钱逸泰鞠治成邢政尹从明马小健
Owner SHANDONG UNIV
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