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A kind of negative electrode material and preparation method thereof and sodium ion battery containing the negative electrode material

A negative electrode material, in-situ preparation technology, applied in the direction of negative electrode, battery electrode, secondary battery, etc., can solve the problems of dispersed pore structure, environmental pollution, strong corrosion, etc., and achieve large specific surface area, outstanding rate performance, large The effect of stable current charge and discharge performance

Active Publication Date: 2021-05-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is widely used, but it is highly corrosive and requires a large amount of acid in the follow-up, which causes great pollution to the environment.
At present, environmentally friendly pore-forming materials are gradually being paid attention to. For example, NaCl is used as a pore-forming agent because it is easily soluble in water, but in this process only its physical occupation effect is used, which is lower than the melting point. The pore structure prepared by NaCl is dispersed and all are single macropores
In the follow-up process, a large amount of water is still required for complex steps such as ultrasonic cleaning

Method used

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  • A kind of negative electrode material and preparation method thereof and sodium ion battery containing the negative electrode material
  • A kind of negative electrode material and preparation method thereof and sodium ion battery containing the negative electrode material
  • A kind of negative electrode material and preparation method thereof and sodium ion battery containing the negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) According to the mass ratio chitosan:sodium chloride=1:1, weigh 2g chitosan and 2g sodium chloride respectively.

[0065] (2) Add 80mL deionized water into the beaker, add the weighed sodium chloride and stir at room temperature until completely dissolved.

[0066] (3) Add the chitosan powder into the sodium chloride solution, stir well, measure 1mL of glacial acetic acid and add it dropwise into the solution. During this process, the solution will become very viscous, and magnetic stirring should be strengthened. Stirring was continued for 12 hours until the solution was translucent.

[0067] (4) The colloid obtained in (3) was transferred to a freezing environment for 12 hours, and then vacuum-dried for 72 hours to obtain a precursor.

[0068] (5) Put the substance in a porcelain boat, heat it to 1200° C. under an argon atmosphere, and keep it warm for 2 hours to obtain a carbonized material.

[0069] (6) Put the carbonized material obtained in (5) into a mortar...

Embodiment 2

[0072] (1) According to the method of Example 1, the difference is that the heat treatment time is 4 hours and the temperature is 1200° C. to obtain the corresponding negative electrode powder material, which is marked as S2.

[0073] Carry out scanning electron microscope analysis to embodiment 2 see figure 2 , wherein the material structure prepared by sodium chloride under this condition is similar to that of Example 1, both having a porous network structure.

Embodiment 3

[0075] (1) Carry out according to the method for embodiment 1, wherein difference is that the temperature of heat treatment is 1400 ℃, and the time is heat preservation 2 hours. The corresponding negative electrode powder material was obtained, marked as S3.

[0076] The negative electrode material powder that embodiment 3 is obtained is observed under scanning electron microscope, and scanning electron microscope picture is as image 3 shown.

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Abstract

The invention discloses a negative electrode material, a preparation method thereof and a sodium ion battery containing the negative electrode material. The preparation method comprises the following steps: (1) first preparing an aqueous inorganic salt solution, and then adding chitin or chitin derivative powder, Slowly add a co-solvent, continue to stir or ultrasonically obtain a homogeneous sol; (2) freeze the sol obtained in step (1) and dry it in vacuum to obtain a fluffy precursor; (3) heat the precursor obtained in step (2) under an inert atmosphere In the process of calcination and carbonization of chitin or chitin derivatives, porous hard carbon materials are prepared in situ by utilizing the melting and evaporation characteristics of inorganic salts. The negative electrode material of the invention has a cross-linked hole structure, has a large specific surface and is rich in nitrogen. The rich nitrogen element ensures the high electronic conductivity of the material, and at the same time, the three-dimensional cross-linked network is conducive to the rapid deintercalation of sodium ions in it, realizing high-capacity, high-rate charge and discharge of the battery, and improving the cycle stability of the battery.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a negative electrode material, a preparation method of the negative electrode material and a sodium ion battery containing the negative electrode material. Background technique [0002] Traditional fossil energy sources such as coal, oil, and natural gas are becoming increasingly depleted and causing significant environmental pollution. In the 21st century, energy crisis and environmental pollution have become the main problems facing human beings. Vigorously developing and efficiently utilizing renewable clean energy such as wind energy, solar energy, tidal energy, nuclear energy, and geothermal energy has become the most effective way to solve the above two problems. As a carrier of energy storage and conversion, secondary batteries hold the hope of changing the energy structure and reducing environmental pollution. [0003] Although secondary batteries can be used as energy s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 吴川王兆华吴锋白莹
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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