Non-metal doped hard carbon negative electrode material and preparation method thereof

A negative electrode material and non-metallic technology, which is applied in the field of non-metallic doped hard carbon negative electrode materials and its preparation, can solve the problems of unstable solid electrolyte membrane, low reversible capacity of batteries, and low initial Coulombic efficiency, etc., to improve sodium storage capacity , Improve charge and discharge efficiency, reduce the effect of uneven diffusion

Active Publication Date: 2021-10-15
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When hard carbon anode materials are used as battery anode materials, batteries often have problems such as low reversible capacity, low first Coulombic efficiency, insufficient discharge voltage, and unstable solid electrolyte membrane (SEI), which limit the use of hard carbon materials.

Method used

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  • Non-metal doped hard carbon negative electrode material and preparation method thereof
  • Non-metal doped hard carbon negative electrode material and preparation method thereof
  • Non-metal doped hard carbon negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a kind of preparation method of negative electrode material, and this preparation method comprises the following steps:

[0052] S1: washing, drying and pulverizing the biomass waste to obtain waste particles;

[0053] S2: Soak the waste particles in a solution containing a non-metallic compound, filter out the waste particles and dry them to obtain a non-metallic / hard carbon composite material;

[0054] S3: Grinding the non-metal / hard carbon composite material, adding it to the organic carbon source liquid and mixing to obtain a slurry, and drying, sintering and pulverizing the slurry to obtain the negative electrode material.

[0055] Preferably, a preparation method of negative electrode material, comprises the steps:

[0056] (1) washing, drying and pulverizing the biomass waste to obtain waste particles;

[0057] (2) Prepare a non-metallic compound solution, the concentration of the non-metallic compound is 0.1-5mol / L, soak the waste part...

Embodiment 2

[0072] Mix negative electrode materials 1#-8# prepared in the above examples and comparative negative electrode materials D1#-D2#, conductive carbon black and sodium carboxymethyl cellulose in deionized water at a mass ratio of 80:10:10, and grind Make a paste, apply it on the aluminum foil current collector, and then dry it at 80°C for 12 hours, cut out some pole pieces with a diameter of 12mm with a cutting machine, weigh them, calculate the mass of the hard carbon material (active material), and then In the gas-protected glove box, the metal sodium sheet is used as the positive electrode, the dry-process PP film is used as the diaphragm, and 1mol / LNaClO 4 The / PC solution is the electrolyte, and a 2032 button half-cell is assembled, and the sodium-ion half-cell is charged and discharged in the constant current charge-discharge mode, and the voltage range is 1.0-4.2V. The test results are shown in Table 3:

[0073] table 3

[0074]

[0075] According to the data of tabl...

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Abstract

The invention discloses a non-metal doped hard carbon negative electrode material and a preparation method thereof, and belongs to the field of sodium ion batteries. The negative electrode material comprises a carbon shell, a non-metallic element and hard carbon, the non-metallic element is doped in the hard carbon, and the carbon shell coats the non-metallic element and the hard carbon; and the porosity of the negative electrode material is 20-30%, the pore diameter is 30-150 nm, the proportion of pores smaller than 50 nm is 10% or below, and the proportion of pores larger than 100 nm is 60% or above. The non-metallic elements are doped in the hard carbon, so that the interlayer spacing of the hard carbon can be reduced, the number of micropores in the negative electrode material is reduced, and the sizes of the micropores are increased, thereby improving the sodium storage capacity of the hard carbon material, improving the reversible capacity and the first efficiency of the battery, reducing side reactions in the battery, and further prolonging the service life of the battery.

Description

technical field [0001] The application relates to a non-metallic doped hard carbon negative electrode material and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] In recent years, the production and sales of new energy vehicles in China have continued to grow, ranking first in the world. However, traditional lead-acid batteries and nickel-cadmium batteries have low energy efficiency and serious pollution, and lithium-ion batteries have high cost and need to be improved in safety. With the surge in demand for new energy vehicles, it is difficult to meet market demand. Due to the advantages of high safety, low cost, and environmental friendliness, sodium-ion batteries are favored by researchers, which promotes the application of sodium-ion batteries in power batteries. [0003] Hard carbon materials are non-graphitizable amorphous carbon materials with short-range order and long-range disorder. They can be described ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/054
CPCH01M4/587H01M10/054H01M4/625H01M2004/027Y02E60/10
Inventor 时爽二陈慧龙戚昌伟马彦芳张立君王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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