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Silicon carbon-graphite negative electrode material and preparation method and application thereof

A graphite negative electrode and silicon carbon technology, which is applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of easy agglomeration of silicon particles, capacity attenuation, and inability to use graphite composites.

Active Publication Date: 2022-04-12
湖南金阳烯碳新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, it is also found in related technologies that silicon particles are easy to agglomerate and cannot be directly used in combination with graphite, so there is capacity fading and cycle performance deterioration due to volume changes.

Method used

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

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Embodiment 1

[0094] This embodiment is a method for preparing a silicon carbon-graphite negative electrode material, comprising the following steps:

[0095] S1: Add 1g of carbon fiber (Beijing Deke Daojin Technology Co., Ltd., VGCF150nm-200nm carbon nanofiber) to 100g of potassium chlorate and sulfuric acid mixed solution (the mass fraction of potassium chlorate is 5%, the mass fraction of sulfuric acid is 15%), at 65 Stir and react at ℃ for 1 h. After the reaction is completed, filter and rinse with deionized water for 5 times to obtain carbon oxide fibers.

[0096] Graphite particles (G810738, Shanghai Macklin Biochemical Technology Co., Ltd., about 11 μm) were calcined for 1.5 h in an ammonia atmosphere at a temperature of 800 ° C to obtain nitrogen-doped graphite particles (the nitrogen doping content was measured by an elemental analyzer to be 0.8%).

[0097] Add nitrogen-doped graphite particles and carbon oxide fibers to water (mass ratio of nitrogen-doped graphite particles, surf...

Embodiment 2

[0119] This example is a method for preparing a silicon carbon-graphite negative electrode material, and the difference from Example 1 is that the deposition time of titanium nitride in this example is 80s.

[0120] The difference between the carbon silicon-graphite negative electrode material prepared in this embodiment and Example 1 is:

[0121] The thickness of the zirconium nitride layer is 15 nm to 20 nm.

Embodiment 3

[0123] This example is a method for preparing a silicon carbon-graphite negative electrode material, and the difference from Example 1 is that the deposition time of titanium nitride in this example is 60s.

[0124] The difference between the carbon silicon-graphite negative electrode material prepared in this embodiment and Example 1 is:

[0125] The thickness of the zirconium nitride layer is 10 nm to 15 nm.

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Abstract

The invention discloses a silicon carbon-graphite negative electrode material and a preparation method and application thereof, and the preparation method of the negative electrode material comprises the following steps: S1, oxidizing carbon fibers, mixing the oxidized carbon fibers with nitrogen-doped graphite particles, a surfactant and silicate ester, carrying out a hydrothermal reaction, carrying out solid-liquid separation, and collecting a solid phase; s2, under the protective atmosphere, the solid phase obtained in the step S1 and metal powder are mixed and then subjected to a reduction reaction; s3, sequentially carrying out carbon coating and zirconium oxide coating on a product obtained in the step S2; the nitrogen content of the nitrogen-doped graphite particles is 0.5%-1.0%. According to the negative electrode material, carbon fibers are used as a matrix; the silicon particles and the nitrogen-doped graphite particles are connected through the carbon fibers, and the carbon fibers serve as a substrate of the silicon particles and a conductive network to fix the silicon particles and the nitrogen-doped graphite particles in the negative electrode conductive network. And then through carbon coating and zirconium nitride coating, the finally prepared negative electrode material has excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a silicon carbon-graphite negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode materials (lithium-intercalated transition metal oxides), negative electrode materials (highly graphitized carbon), separators (polyolefin microporous membranes), and electrolyte materials. [0003] The negative electrode active material mainly used in lithium-ion batteries is graphite material, and the theoretical specific capacity of graphite material is only 372mAh / g, which limits the improvement of battery energy density. In the related art, a silicon-based negative electrode material has also been developed. The theoretical specific capacity of the silicon-based negative electrode material is as high as 4200mAh / g, but its application prospect is still not optimistic ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M10/0525
CPCY02E60/10
Inventor 刘建忠邹武王恒刘思柳家富段元兴
Owner 湖南金阳烯碳新材料股份有限公司
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