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Preparation method of boron-doped silicon-carbon composite material

A technology of silicon-carbon composite materials and boron doping, which is applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, can solve problems such as poor cycle stability, achieve low cost, and improve surface activity , The effect of simple process

Inactive Publication Date: 2021-05-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for preparing a boron-doped silicon-carbon composite material to overcome the problem of poor cycle stability existing in existing silicon-based negative electrode materials

Method used

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  • Preparation method of boron-doped silicon-carbon composite material
  • Preparation method of boron-doped silicon-carbon composite material
  • Preparation method of boron-doped silicon-carbon composite material

Examples

Experimental program
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Embodiment 1

[0038] This embodiment provides a method for preparing a boron-doped silicon-carbon composite material, specifically:

[0039] To prepare silicon-carbon composite nanostructures, 300 mg of Si nanoparticles and 920 mg of cetyltrimethylammonium bromide were added to a mixed solution of 28.16 mL of deionized water and 11.28 mL of ethanol, and sonicated for 30 min to form a homogeneous mixed solution . Next, 120 mg of resorcinol and 0.1 mL of ammonia water were added to the mixed solution, and stirred at 35° C. for 30 minutes. After that, 4 mL of formaldehyde was added dropwise to the mixed solution, and reacted at 35° C. for 6 hours. Then aged for 12 hours at room temperature. Core-shell nanoparticles were obtained after centrifugation and drying at 60 °C.

[0040] The obtained powder was placed in a tube furnace for carbonization in an Ar atmosphere at 900 °C for 3 hours with a heating rate of 2 °C / min. The obtained carbonized product is a black powder, and the carbon skelet...

Embodiment 2

[0049] This embodiment provides a method for preparing a boron-doped silicon-carbon composite material:

[0050] Referring to Example 1, a boron-doped silicon-carbon composite material was prepared, wherein the mass of boric acid was 50 mg, the heat treatment temperature was lowered to 800° C., and the rest were the same as in Example 1 to obtain a boron-doped silicon-carbon composite material.

[0051] Electrode preparation and battery assembly were carried out in the same manner as in Example 1, which will not be repeated here.

Embodiment 3

[0053] This embodiment provides a method for preparing a boron-doped silicon-carbon composite material, specifically:

[0054] Referring to Example 1, a boron-doped silicon-carbon composite material was prepared, wherein the mass of boric acid was 70 mg, and the rest were the same as in Example 1 to obtain a boron-doped silicon-carbon composite material.

[0055] Electrode preparation and battery assembly were carried out in the same manner as in Example 1, which will not be repeated here.

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Abstract

The invention relates to a preparation method of a boron-doped silicon-carbon composite material. The method comprises the steps of uniformly coating monatomic silicon with a layer of phenolic resin, carrying out heat treatment to obtain a mesoporous carbon shell, mixing the mesoporous carbon shell with a boric acid aqueous solution, and carrying out freeze drying and thermal reduction. The method is simple in process and relatively low in cost, the silicon-carbon composite negative electrode material with different boron doping amounts can be obtained by changing the content of boric acid, and the cycling stability of the silicon-based negative electrode material can be effectively improved.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion battery electrode materials, in particular to a preparation method of a boron-doped silicon-carbon composite material. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, portable devices, etc. due to their advantages such as high energy density, high Coulombic efficiency, and low self-discharge characteristics. In recent years, with society's increasing demand for electric vehicles, hybrid electric vehicles, aerospace applications, and mobile electronic devices, researchers have focused on developing next-generation lithium-ion batteries with high charging capacity and power density. [0003] The anode materials of traditional lithium-ion batteries are mainly graphite materials. Graphite has excellent electrical conductivity, good reversibility, and relatively low cost, but because every six carbon atoms in the graphite material can only accommodate...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 杨建平张方舟姜苗苗马元元
Owner DONGHUA UNIV
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