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Micronano-structure carbon silicon composite microsphere and preparation method and application thereof

A technology of structured carbon and composite microspheres, applied in structural parts, nanotechnology, nanotechnology, etc., can solve problems such as environmental pollution, cumbersome process, and harsh conditions

Inactive Publication Date: 2017-10-10
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation method is cumbersome, the conditions are harsh, and HF needs to be used for etching. HF will pollute the environment and is not conducive to industrialization.

Method used

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  • Micronano-structure carbon silicon composite microsphere and preparation method and application thereof
  • Micronano-structure carbon silicon composite microsphere and preparation method and application thereof
  • Micronano-structure carbon silicon composite microsphere and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0067]20nm silicon dioxide (such as figure 1 Shown) and glucose aqueous solution are mixed, as the precursor solution of spray drying; In this precursor solution, solute concentration is 15wt%; During spray drying, feed rate is 10mL / min, and air inlet temperature is 150 ℃, and air outlet The temperature was 80°C, and the carrier gas was air; the obtained powder was heat-treated under hydrogen at 500°C for 2 hours to obtain micronano structured carbon-silicon dioxide composite microspheres; magnesium was used as the reducing agent (the mass ratio of the obtained powder to the mass of the reducing agent Ratio 1:1), the prepared micronanostructured carbon-silica composite microspheres were reduced in a mixed atmosphere of hydrogen and argon at 650°C for 2h, and treated with 3 mol / L HCl to obtain micronanostructured carbon silicon Composite microspheres, the particle size of the prepared micro-nano structured carbon-silicon composite microspheres is 1-5 μm, the results are as foll...

Embodiment 2

[0070] A solution of 5nm silicon dioxide and polystyrene in dichloroethane was mixed as a spray-dried precursor solution; the solute concentration in the precursor solution was 0.1 wt%. During spray drying, the feed rate is 0.5mL / min, the inlet air temperature is 100°C, the outlet air temperature is 70°C, and the carrier gas is air. The obtained powder was heat-treated under argon at 900°C for 30 minutes to obtain micronano structured carbon-silicon dioxide composite microspheres; magnesium was used as a reducing agent (the mass ratio of the obtained powder to the reducing agent was 1:0.6), and the obtained Micronanostructured carbon-silicon dioxide composite microspheres were reduced in a mixed atmosphere of hydrogen and argon at 800°C for 0.5h, and treated with 4 mol / L sulfuric acid to obtain micronanostructured carbon silicon Composite microspheres; the particle size of the prepared micro-nano structured carbon-silicon composite microspheres is 0.5-2 μm; wherein, the weight...

Embodiment 3

[0073] An aqueous solution of 100 nm silicon dioxide particles, carbon nanotubes and starch was mixed as a spray-dried precursor solution; in the precursor solution, the solute concentration was 60 wt%. During spray drying, the feed rate was 95mL / min, the inlet air temperature was 220°C, the outlet air temperature was 100°C, and the carrier gas was argon. The obtained powder was heat-treated at 700°C for 6 h under nitrogen to obtain micronano structured carbon-silicon dioxide composite microspheres; using potassium as the reducing agent (the mass ratio of the obtained powder to the reducing agent was 1:3), the obtained micronanostructured carbon-silica composite microspheres were Nanostructured carbon-silicon dioxide composite microspheres were reduced in a mixed atmosphere of hydrogen and argon at 100°C for 48 hours, and the obtained composite microspheres were treated with 3 mol / L HCl to obtain micro-nano structured carbon-silicon composite microspheres; The particle size of...

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Abstract

The invention relates to a micronano-structure carbon silicon composite microsphere and a preparation method and application thereof. According to the preparation method, a silicon dioxide nanoparticle, a protection agent and a carbon nanometer material are combined and micronano-structurized by a spray drying method, a carbon / silicon dioxide composite microsphere is obtained by thermal processing under non-oxidization atmosphere, and the micronano-structure carbon silicon composite microsphere is further obtained by a metallothermic reduction method. The preparation method is low in cost, simple in process and low in energy consumption and can be promoted on a large scale; moreover, the carbon silicon nanoparticle in the obtained micronano-structure carbon silicon composite microsphere is provided with a core-hollow shell structure, and the micronano-structure carbon silicon composite microsphere is high in charge-discharge volume specific capacity and has cycle stability when used as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium-ion batteries, in particular to a micro-nano structured carbon-silicon composite microsphere and its preparation method and application, especially to a micro-nano structured carbon-silicon composite microsphere with a core-hollow shell structure. Balls and methods for their preparation and use. Background technique [0002] Silicon can be used as a negative electrode active material to replace graphite in secondary batteries, especially lithium-ion batteries, which has better capacity. However, the silicon material is accompanied by a huge volume change during charge and discharge, and the mechanical stress generated leads to the pulverization and structural collapse of the active material and the detachment between the material and the current collector, resulting in rapid capacity fading and reduced battery cycle performance. In addition, due to this volume exp...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 李祥龙张兴豪智林杰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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