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Sodium ion battery negative electrode material based on carbon material and pitch and preparation method and application thereof

A technology of sodium ion battery and negative electrode material, applied in the field of materials, can solve problems such as restricting the practical application of sodium ion battery, and achieve the effects of adjustable disorder degree, high working voltage and energy density, and excellent electrical conductivity

Active Publication Date: 2019-01-04
INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the research and development of some positive electrode materials have basically met the application requirements, but the negative electrode materials still restrict the practical application of sodium ion batteries

Method used

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  • Sodium ion battery negative electrode material based on carbon material and pitch and preparation method and application thereof
  • Sodium ion battery negative electrode material based on carbon material and pitch and preparation method and application thereof
  • Sodium ion battery negative electrode material based on carbon material and pitch and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] figure 1 The preparation method of the sodium ion battery negative electrode material based on carbon material and pitch provided for the embodiment of the present invention, its steps are as follows figure 1 shown, including:

[0048]Step 110, pulverizing and mixing one or more charcoal and / or bamboo charcoal and asphalt raw materials according to a mass ratio of 1:(0.05-0.2) to obtain coarse powder;

[0049] Specifically, the pulverization and mixing method is preferably mechanical mixing, including mechanical pulverization, ball milling, stirring, sieving and ultrasonic dispersion, and any combination of the above-mentioned methods. The time of mechanical mixing can be determined according to the selected precursor and the size of the required pulverized particle size.

[0050] Among them, charcoal includes one or more mixtures of white carbon, black carbon, activated carbon and machine-made carbon, bamboo charcoal includes one or more mixtures of carbonized materi...

Embodiment 2

[0061] This example provides the negative electrode material for a sodium ion battery prepared in Example 1 above.

[0062] According to the selected carbon material raw materials and the ratio of compounding with asphalt, the prepared negative electrode material has an orderly surface structure, disordered interior, and irregular block or vertical channel shape. Irregular massive carbon materials prepared by compounding charcoal and pitch, with a size between 2-10 microns, d 002 The value is between 0.37-0.40nm, the Lc value is between 1-4nm, and the La value is between 3-5nm; the vertical channel-shaped carbon material prepared by compounding charcoal and pitch, the length is between 5-30 microns, Pipe pore size between 2-3 microns, d 002 The value is between 0.36-0.38nm, the Lc value is between 1-4nm, and the La value is between 3-5nm; the irregular block carbon material prepared by compounding bamboo charcoal and pitch, the size is between 2-15 microns, d 002 The value ...

Embodiment 3

[0066] Weigh 2g of iron charcoal, mechanically grind 0.1g of petroleum asphalt, mix them evenly, and put them into a magnetic boat. First put it into a muffle furnace, raise the temperature to 260°C at a rate of 3°C / min, and keep it warm for 3 hours to obtain a heat-treated pitch-coated carbon material. Then put the heat-treated powder into a tube furnace with argon as a protective gas, raise the temperature to 1400°C at a rate of 3°C / min, and keep it warm for 2 hours; then naturally cool to room temperature, take out the material, and obtain the final compound The carbon material is the negative electrode material of the sodium ion secondary battery.

[0067] Its XRD pattern sees Figure 4 . The d of the carbon material can be obtained from the XRD pattern 002 = 0.392nm, L c = 2.15nm. Its Raman spectrum see Figure 5 , the L of the carbon material can be obtained from the Raman spectrum a = 3.18nm. Image 6 The SEM image of the carbon material prepared in this example...

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Abstract

The invention discloses a sodium ion battery negative electrode material based on carbon material and pitch and a preparation method and application thereof, wherein the sodium ion battery negative electrode material is a composite carbon material of which the surface is coated with pitch-based ordered carbon structure and appearance is an irregular block shape or vertical channel shape. The carbon material and the pitch are used as precursor raw materials, the pitch is melted and coated on the surface of the carbon material by heat treatment in the air after mechanical mixing, and then the pitch and the carbon material are carbonized and cracked in an inert atmosphere at the same time to obtain a composite carbon material with a surface orderly structure and an internal disorderly structure; Wherein the kind of charcoal comprises charcoal and bamboo charcoal, the charcoal comprises one or more mixtures of white charcoal, black charcoal, activated carbon and machine charcoal, the bamboo charcoal comprises one or more mixtures of carbonized materials of bamboo, pale bamboo, bitter bamboo, thunder bamboo and yellow bamboo, and the pitch is one or more mixtures of coal tar pitch, petroleum pitch and natural pitch.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a carbon material and asphalt-based sodium ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] With the gradual depletion of fossil fuels and the increasing environmental pollution, the development and utilization of new energy carriers has attracted more and more attention. Secondary batteries, as the main chemical energy storage devices, play an important role in this field. Replacing fossil fuels with electricity as the main energy source for transportation will significantly reduce greenhouse gas emissions. Building and improving various power grid systems with wind energy, solar energy, geothermal energy and other renewable energy configurations will greatly increase the efficiency of renewable energy use. [0003] Sodium-ion batteries, with their advantages of rich sodium resources, wide distribution an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/054H01M4/583H01M4/62
CPCH01M4/366H01M4/583H01M4/625H01M10/054H01M4/133H01M4/36H01M4/62Y02E60/10
Inventor 陆雅翔容晓晖秦东唐堃胡勇胜陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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