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High-performance silicon-carbon composite material, preparation method thereof and lithium ion battery

A technology of silicon-carbon composite materials and composite materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problem of limiting electron conduction rate, difficulty in ensuring fast transmission, and rapid capacity decay, etc. problems, to achieve the effect of wide source of raw materials, excellent electrochemical performance and long cycle life

Pending Publication Date: 2022-04-12
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional carbon materials are prone to fragmentation during silicon cycling, resulting in faster capacity decay after a large number of cycles, and amorphous carbon materials limit the electron conduction rate.
Therefore, the existing silicon-carbon composite materials still have volume expansion, which causes the pole pieces to pulverize and fall off, leading to the problem of battery performance attenuation; and in the structure of commonly used carbon materials to coat silicon particles, there is a gap between the silicon core and the carbon shell. The conductivity is poor, it is difficult to ensure that Li + and e - The disadvantage of fast transmission

Method used

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  • High-performance silicon-carbon composite material, preparation method thereof and lithium ion battery
  • High-performance silicon-carbon composite material, preparation method thereof and lithium ion battery
  • High-performance silicon-carbon composite material, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0100] The invention provides a method for preparing a silicon-carbon composite material, comprising the following steps:

[0101] 1) After ball milling silicon powder and graphene source, silicon / graphene composite material is obtained;

[0102] 2) After mixing the silicon / graphene composite material and MAX slurry obtained in the above steps, a mixture is obtained;

[0103] 3) The mixture obtained in the above steps and the etchant are mixed again, and reacted to obtain a silicon-carbon composite material.

[0104] The present invention can correspond to the parameters and selection of raw materials and products in the above-mentioned preparation method, as well as the corresponding optimization principles, and the parameters and selection of raw materials and products in the aforementioned composite materials, as well as the corresponding optimization principles, and will not repeat them here. A repeat.

[0105] In the present invention, silicon powder and graphene source...

Embodiment 1

[0147] With expanded graphite, D50=60nm silicon powder, Ti 2 AlC as raw material

[0148] First, mix silicon powder and expanded graphite with a particle size of D50=60nm according to a mass ratio of 1:1, and ball mill for 2 hours to obtain a graphene-coated silicon composite material;

[0149] Then weigh the composite material mass ratio of 5% Ti 2 Ultrasonic dispersion of AlC in absolute ethanol, adding graphene-coated silicon composites to Ti 2 In AlC solution, ultrasonically disperse evenly;

[0150] Then the above material is subjected to hydrothermal treatment under the condition of 65% sodium hydroxide solution in mass fraction and 270°C to remove Ti 2 Al in AlC, then fully centrifuged and washed with ethanol and deionized water, and spray-dried to obtain the silicon-carbon composite material Si@GE@Ti 2 c.

[0151] The silicon-carbon composite material prepared in Example 1 of the present invention was characterized.

[0152] see figure 1 , figure 1 TEM transmis...

Embodiment 2

[0161] With expanded graphite, D50=80nm silicon powder, Ti 3 SiC 2 as raw material

[0162] First, mix silicon powder and expanded graphite with a particle size of D50=80nm according to a mass ratio of 1:1.5, and ball mill for 2 hours to obtain a graphene-coated silicon composite material;

[0163] Then weigh the composite material mass ratio of 8% Ti 3 SiC 2 Ultrasonic dispersion in absolute ethanol to add graphene-coated silicon composites to Ti 3 SiC 2 In the solution, ultrasonically disperse evenly;

[0164] Then the above material is subjected to hydrothermal treatment under the condition of 40% hydrofluoric acid solution in mass fraction and 60°C to remove Ti 3 SiC 2 Si in the Si, then fully centrifuged with ethanol and deionized water, and spray-dried to obtain the silicon-carbon composite material Si@GE@Ti 2 c.

[0165] The silicon-carbon composite material prepared in Example 2 of the present invention was characterized.

[0166] see image 3 , image 3 TE...

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Abstract

The invention provides a silicon-carbon composite material. The silicon-carbon composite material comprises a silicon / graphene composite material and MXene, the silicon / graphene nano particles are compounded on the MXene sheet layer. The high-performance silicon-carbon composite material has a special composition and structure, is a high-performance silicon-carbon composite material with a sandwich structure, is beneficial to shortening an electron transmission path, can greatly improve the cycling stability and power performance of a lithium ion battery, can inhibit silicon volume expansion, is beneficial to keeping the structural integrity of a negative electrode active material, and has a good application prospect. According to the preparation method disclosed by the invention, the Si-coated GE-MXene silicon-carbon composite material can be used for promoting electron and ion migration, inhibiting aggregation and volume expansion of Si-coated GE nanoparticles and enhancing the stability, and finally, the improvement of the Si-coated GE-MXene silicon-carbon composite material in multiple aspects such as structural stability, electrochemical performance and electron / ion migration characteristics, especially the cycle stability and reversible performance of the material, is realized. The preparation method provided by the invention is simple in process, easy to operate and suitable for large-scale production and popularization.

Description

technical field [0001] The invention belongs to the technical field of silicon-carbon composite materials, and relates to a silicon-carbon composite material, a preparation method thereof, and a lithium-ion battery, and in particular to a high-performance silicon-carbon composite material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Due to the advantages of high open circuit voltage, high energy density, low self-discharge rate and no pollution, lithium-ion batteries are widely used in electronic equipment, electric transportation, aerospace, military, medical and other fields. With the rapid development of portable electronic products, higher requirements are placed on the volumetric energy density and mass energy density of lithium-ion batteries (LIBs). At present, commercial lithium-ion batteries mainly use carbon materials as negative electrodes, and graphite is the most widely used due to its layered structure that facilitates ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 张聪马俊青苗力孝
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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