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Double-coated silicon-based composite material si@c@tio2 and its preparation method

A silicon-based composite material and composite material technology, which is applied in nanotechnology, nanotechnology, structural parts and other directions for materials and surface science, can solve the problems of low mechanical strength of carbon shells, affecting the electrochemical stability of composite materials, etc. Achieve excellent electrochemical performance, improve electrochemical performance, and improve cycle stability.

Active Publication Date: 2018-09-25
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 mechanical strength of the carbon shell prepared by this method is low, which affects the electrochemical stability of the composite material.

Method used

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  • Double-coated silicon-based composite material si@c@tio2 and its preparation method
  • Double-coated silicon-based composite material si@c@tio2 and its preparation method
  • Double-coated silicon-based composite material si@c@tio2 and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1. Preparation of silicon-carbon core-shell structure: Add 3.0 g of polyvinylpyrrolidone (K90) to 200 mL of absolute ethanol at room temperature, and stir until the polyvinylpyrrolidone is completely dissolved. Weigh 0.3g of silicon nanoparticles (30 nm) into 50mL of absolute ethanol, and sonicate for 1.5h. All the dispersion of silicon nanoparticles was slowly poured into the above-mentioned polyvinylpyrrolidone solution, and stirred until the silicon nanoparticles were uniformly dispersed again. Heat to 45°C, stir to evaporate the solvent, and dry in a vacuum oven at 80°C. The obtained solid was carbonized at a high temperature of 650°C for 2 hours under an argon atmosphere (the heating rate was 3°C / min).

[0033] 2. Preparation of double-coated core-shell silicon matrix composite Si@C@TiO 2 : Weigh 150mg of the silicon-carbon core-shell material prepared in step 1 and add it to 60mL of absolute ethanol, and sonicate for 0.5h. Add 0.18mL concentrated ammonia water ...

Embodiment 2

[0039] 1. Preparation of silicon-carbon core-shell structure: Add 2.5 g of polyvinylpyrrolidone (K60) to 200 mL of absolute ethanol at room temperature, and stir until the polyvinylpyrrolidone is completely dissolved. Weigh 0.3g of silicon nanoparticles (50 nm) into 100mL of absolute ethanol, and sonicate for 1h. All the dispersion of silicon nanoparticles was slowly poured into the above-mentioned polyvinylpyrrolidone solution, and stirred until the silicon nanoparticles were uniformly dispersed again. Heat to 40°C, stir to evaporate the solvent, and dry in a vacuum oven at 80°C. The obtained solid was carbonized at a high temperature of 800°C for 1 h under an argon atmosphere (the heating rate was 5°C / min).

[0040] 2. Preparation of double-coated core-shell silicon matrix composite Si@C@TiO 2 : Weigh 150mg of the silicon-carbon core-shell material prepared in step 1 and add it to 60mL of absolute ethanol, and sonicate for 0.5h. Add 0.075mL of concentrated ammonia water (...

Embodiment 3

[0045] 1. Preparation of silicon-carbon core-shell structure: Add 2.0 g of polyvinylpyrrolidone (K30) to 200 mL of absolute ethanol at room temperature, and stir until the polyvinylpyrrolidone is completely dissolved. Weigh 0.3g of silicon nanoparticles (30 nm) into 25mL of absolute ethanol, and sonicate for 0.5h. Slowly pour all the dispersion of silicon nanoparticles into the above-mentioned polyvinylpyrrolidone solution, and continue stirring until the silicon nanoparticles are uniformly dispersed again. Heat to 65°C, stir to evaporate the solvent, and dry in a vacuum oven at 80°C. The obtained solid was carbonized at a high temperature of 600° C. for 3 h under an argon atmosphere (the heating rate was 3° C. / min).

[0046] 2. Preparation of double-coated core-shell silicon matrix composite Si@C@TiO 2 : Weigh 150mg of the silicon-carbon core-shell material prepared in step 1 and add it to 70mL of absolute ethanol, and sonicate for 1h. Add 0.18mL of concentrated ammonia wa...

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Abstract

The invention relates to a double covered silicon-based composite materialSi@C@TiO2, and belongs to a double covered composite material which uses silicon (Si) nanoparticles as cores and carbon (C) and titanium dioxide (TiO2) as cases and is of a porous structure, wherein the Si, C and TiO2 contents are controlled as follows that the mass ratio of the Si to the C is (1.9:1) to (2.1:1); the mass ratio of the C to the TiO2 is (1.6:1) to (4.5:1). The composite material has the advantages that the cost is low; the circulation stability is good; the mass production is realized.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a carbon and titanium dioxide double-coated silicon-based composite material Si@C@TiO 2 and its preparation method. Background technique [0002] Lithium-ion batteries have been widely used in electronic devices due to their excellent characteristics such as high energy density, good cycle performance, environmental friendliness and low cost. At present, the anode material of commercial lithium-ion batteries is mainly graphite carbon, and its theoretical specific capacity is only 372 mAh / g, which cannot meet people's demand for high-energy portable mobile power. When silicon is used as the negative electrode material, the theoretical specific capacity is as high as 4200 mAh / g, and the discharge potential is about 0.4 V vs .Li / Li + , has unique advantages and potential in many graphitic carbon alternative anode materials. However, silicon as an anode material int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 宋燕杨桃刘占军
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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