Silicon material, preparation method and application thereof, and device using silicon material

A silicon material and silicon source technology, applied in the field of materials, can solve the problem of further improvement of charge-discharge specific capacity and cycle stability, achieve excellent cycle stability, achieve large-scale production, and improve self-stability.

Pending Publication Date: 2022-06-07
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the products obtained by this method still need to be further improved in terms of charge-discharge specific capacity and cycle stability.

Method used

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  • Silicon material, preparation method and application thereof, and device using silicon material
  • Silicon material, preparation method and application thereof, and device using silicon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of flower cluster structure silicon material:

[0057] The crystalline silicon particles (1-5 μm) and metal lithium mixed in a 1:1 weight ratio under an argon atmosphere were heated to 300 °C, kept for 1 h, and then heated to 650 °C under a low pressure (90 kPa) argon atmosphere. After keeping the temperature for 2 hours, the cooled product was washed with ethanol and water to remove lithium-containing by-products to obtain a flower cluster structure silicon material.

[0058] figure 1 The scanning electron microscope image of the silicon material prepared in this example shows that the flower-like silicon microparticles are composed of interconnected wavy two-dimensional silicon nanosheets, and have a flower-like structure.

[0059] The silicon material prepared in this example includes flower-like silicon microparticles composed of wavy silicon nanosheets connected to each other, the flower-like silicon microparticles have a particle size of 1-6 μm, and t...

Embodiment 2

[0065] Preparation of flower cluster structure silicon material:

[0066] In an argon atmosphere, the crystalline silicon particles (5-10 μm) and metal lithium mixed in a weight ratio of 3:2 were heated to 250 °C and kept for 2 h, and then heated to 700 °C under a low pressure (80 kPa) nitrogen atmosphere, and then kept for 1 h. , the cooled product is washed with ethylene glycol and water to remove lithium-containing by-products (such as lithium nitride) to obtain a flower cluster structure silicon material.

[0067] The silicon material prepared in this example includes flower-like silicon micro-particles formed by interconnecting wavy silicon nanosheets. The flower-like silicon micro-particles have a particle size of 8-15 μm, and the 10-20nm.

[0068] Prepare the negative electrode:

[0069] Using the flower cluster structure silicon material of this embodiment as the negative electrode active material, the negative electrode active material, the binder polyacrylic acid (...

Embodiment 3

[0073] Preparation of flower cluster structure silicon material:

[0074] In an argon atmosphere, the crystalline silicon particles (5-10 μm) and metal lithium mixed in a weight ratio of 6:5 were heated to 400 °C and kept for 30 min, and then heated to 600 °C under a low pressure (50 kPa) helium atmosphere, and then kept at a temperature of 600 °C. 4h, the cooled product was washed with isopropanol and water to remove lithium-containing by-products to obtain a flower cluster structure silicon material.

[0075] The silicon material prepared in this example includes flower-like silicon micro-particles formed by interconnecting wavy silicon nanosheets. The flower-like silicon micro-particles have a particle size of 8-15 μm, and the 20-30nm.

[0076] Prepare the negative electrode:

[0077] Using the flower cluster structure silicon material of this embodiment as the negative electrode active material, the negative electrode active material, the binder sodium alginate, and the ...

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Abstract

The invention provides a silicon material, a preparation method and application thereof, and a device using the silicon material. The silicon material comprises flower-cluster-shaped silicon micron particles formed by mutually connecting wavy silicon nanosheets. The method comprises the following steps: 1) melting and mixing a silicon source and a lithium source in an inert atmosphere to obtain a molten product; and 2) carrying out heat treatment on the molten product in a low-pressure and non-oxidizing atmosphere to obtain the silicon material. In the silicon material, the wavy two-dimensional silicon nanosheets have the stress self-release characteristic, so that the self-stability of the structure and the interface of silicon in the volume change process is improved, and the diffusion path of lithium ions is greatly shortened; the flower-cluster-shaped micron structure not only facilitates efficient transmission of electrons and low-tortuosity transmission of lithium ions, but also improves the tap density of the material.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a silicon material, its preparation method, application and device using the same. Background technique [0002] In order to meet the growing energy demands of portable electronic devices and electric vehicles, people have been pursuing higher energy density of lithium-ion rechargeable batteries. However, as the most commonly used anode material, graphite material has a low theoretical capacity and cannot meet these requirements. From the development history of lithium-ion batteries, every breakthrough in energy density is brought about by the development of new electrode materials. Therefore, new anode materials that can provide higher energy density, longer cycle life, and safe discharge / charge potential are urgently needed. [0003] Among all possible anode material candidates, silicon stands out due to its abundant natural resources, low cost, and large reversible capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/02H01M4/38H01M10/0525
CPCC01B33/02H01M4/386H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 李祥龙王邓辉王斌智林杰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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