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Silicon-carbon negative electrode material and preparation method thereof

A technology of silicon-based negative electrode materials and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor electrical conductivity, poor electrical conductivity, and high cost of polymers, and achieve enhanced bonding, enhanced electrical conductivity, and strong The effect of mechanical properties

Inactive Publication Date: 2020-04-24
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problems of silicon anode materials are poor conductivity, large volume change, continuous SEI film, and low cycle life. Usually, it needs to be used in combination with carbon materials to form a new type of silicon-carbon anode material to solve the above problems.
[0005] Publication number is: the patent of CN105470459B provides a kind of preparation method of silicon-carbon negative electrode material, and its coating material used is macromolecule material, but macromolecule conductivity is relatively poor, and the expansion bundle intensity for silicon-carbon negative electrode is not enough, in addition The whole process is relatively complicated, more impurities are introduced, and the preparation cost is relatively high
[0006] Publication number is: the patent of CN106159215A also discloses a kind of preparation method of silicon carbon negative electrode material, and it through multi-step polymerization, in situ coating on silicon surface, forms the silicon carbon negative electrode material of carbon material coating, but whole process involves relatively Many polymerization reactions, difficult to control, high cost, not convenient for industrial production

Method used

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  • Silicon-carbon negative electrode material and preparation method thereof
  • Silicon-carbon negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] S1. Add silicon nanoparticles with D50 of 30nm to the aqueous dispersion of graphene oxide, and then obtain a dispersion of silicon-based material-graphene oxide under high-speed shear force, wherein the mass percentage of silicon:graphene oxide=50 %: 50%, the initial concentration of the graphene oxide solution is 0.1g / ml, the solid content of the mixed solution is 20%, and then the mixed solution is dispersed at a speed of 2000rpm for 24h to obtain a uniform graphene oxide-silicon nanoparticle dispersion;

[0033] S2. Spray-dry the mixed solution obtained in step S1 at 120°C for the first time, wherein the diameter of the obtained graphene oxide-coated silicon nanoparticles after drying is 1um; carbonize for the first time under the condition of 600°C in an argon atmosphere to obtain particles Graphene-coated nano-silicon particles with a diameter of about 800nm, wherein the mass percentage of graphene:silicon in the composite material is 40%:60%;

[0034] S3 Add appr...

Embodiment 2

[0037] S1 Add silicon nanoparticles with a D50 of 150nm to the aqueous dispersion of graphene oxide, and then obtain a silicon-based material-graphene oxide dispersion under high-speed shear force, wherein the mass percentage of silicon: graphene oxide = 50% : 50%, the initial concentration of the graphene oxide solution is 0.1g / ml, the solid content of the mixed solution is 20%, and then the mixed solution is dispersed at a speed of 2000rpm for 24h to obtain a uniform graphene oxide-silicon nanoparticle dispersion;

[0038] S2 Spray-dry the mixed solution obtained in step S1 at 120°C for the first time, and the diameter of the obtained graphene oxide-coated silicon nanoparticles after drying is 1um; carbonize for the first time under the condition of 600°C in an argon atmosphere, and obtain a particle size of Graphene-coated nano-silicon particles with a thickness of about 800nm, the mass percentage of graphene:silicon in the composite material is 40%:60%;

[0039] S3 Add app...

Embodiment 3

[0042] S1 Add silicon nanoparticles with a D50 of 100nm to the aqueous dispersion of graphene oxide, and then obtain a dispersion of silicon-graphene oxide under high-speed shear force, wherein the mass percentage of silicon:graphene oxide=50%:50 %, the initial concentration of the graphene oxide solution is 0.1g / ml, and the solid content of the mixed solution is 50%, then the mixed solution is dispersed for 24h at a speed of 2000rpm to obtain a uniform graphene oxide-silicon nanoparticle dispersion;

[0043] S2 Spray-dry the mixture obtained in step S1 at 120°C for the first time, and the diameter of the obtained graphene oxide-coated silicon nanoparticles after drying is 1.5um; carbonize for the first time under the condition of 800°C in an argon atmosphere to obtain the particle size It is about 1.2um graphene-coated nano-silicon particles, and the mass percentage of graphene:silicon in the composite material is 40%:60%;

[0044] S3 Add appropriate amount of water to the gr...

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Abstract

The invention relates to a silicon-carbon negative electrode material and a preparation method thereof, which belong to the technical field of lithium ion batteries. The preparation method comprises the steps of (1) adding silicon-based nanoparticles into an aqueous dispersion of graphene oxide, then stirring and mixing, carrying out spray drying on the mixed solution, and then carrying out high-temperature carbonization in an inert atmosphere to obtain a graphene-coated nano-silicon composite material; and (2) carrying out high-solid-content kneading and stirring on the graphene-coated silicon nano material, graphite and an adhesive, carrying out spray drying on the mixture of the graphene-coated silicon nano material, graphite and the adhesive again, and further carrying out carbonization treatment in a high-temperature inert atmosphere to obtain the graphite and graphene-coated silicon-carbon secondary particles. According to the invention, the surface of the nano silicon-based material is coated with a layer of graphene, so that the conductivity of the silicon-based material is improved, and the volume expansion of the silicon negative electrode in the charging and dischargingprocess is inhibited; and in-situ compounding is carried out on the graphene-coated silicon-carbon negative electrode, graphite and the adhesive to form silicon-carbon-graphite secondary particles, sothat the volume expansion is further reduced while the dynamic property of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a silicon-carbon composite negative electrode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Due to its excellent performance, lithium-ion batteries will have broad application prospects in the fields of portable consumer electronics, power tools, and energy storage. At present, commercial lithium-ion batteries mainly use graphite as the negative electrode material. However, due to the rapid increase in the energy density requirements of batteries in the above-mentioned fields, there is an urgent need to develop lithium-ion batteries with higher energy density. [0003] The specific capacity of the silicon negative electrode material can reach up to 4200mAh / g, which is much higher than the 372mAh / g of the carbon material. It is currently known to be the material with the highest theoretical specific ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/364H01M4/366H01M4/386H01M4/483H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈成猛王振兵苏方远耿文俊孔庆强
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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