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A kind of silicon carbon-graphite negative electrode material and its preparation method and application

A graphite negative electrode and silicon carbon technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of easy aggregation of silicon particles, capacity attenuation, and inability to use graphite composites

Active Publication Date: 2022-05-27
湖南金阳烯碳新材料股份有限公司
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  • 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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  • A kind of silicon carbon-graphite negative electrode material and its preparation method and application

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Embodiment 1

[0094] The present embodiment is a preparation method of a silicon carbon-graphite negative electrode material, comprising the following steps:

[0095] S1: Add 1g carbon fiber (Beijing Deke Island Gold Technology Co., Ltd., VGCF150nm-200nm nano carbon fiber) to 100g 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 The reaction was stirred at °C for 1 h. After the reaction was completed, it was filtered and washed with deionized water for 5 times to obtain carbon oxide fibers.

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

[0097] Nitrogen-doped graphite particles and oxidized carbon fibers were added to water (the mass rati...

Embodiment 2

[0119] This embodiment is a preparation method of a silicon carbon-graphite negative electrode material. The difference from Embodiment 1 is that the deposition time of titanium nitride in this embodiment is 80s.

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

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

Embodiment 3

[0123] This embodiment is a preparation method of a silicon carbon-graphite negative electrode material. The difference from Embodiment 1 is that the deposition time of titanium nitride in this embodiment is 60s.

[0124] The difference between the carbon silicon-graphite negative electrode material prepared in this example 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 its preparation method and application. The preparation method of the negative electrode material includes the following steps: S1. After oxidizing the carbon fiber, mix it with nitrogen-doped graphite particles, a surfactant and Silicic acid ester mixed hydrothermal reaction, solid-liquid separation, and solid phase collection; S2, under a protective atmosphere, the solid phase obtained in step S1 is mixed with metal powder to undergo a reduction reaction; S3, the product obtained in step S2 is sequentially carbon-coated and zirconia coating; the nitrogen content of the nitrogen-doped graphite particles is 0.5%-1.0%. The negative electrode material of the present invention uses carbon fiber as a matrix; the carbon fiber connects silicon particles and nitrogen-doped graphite particles, and the carbon fiber serves as the matrix and conductive network of silicon particles to fix the silicon particles and nitrogen-doped graphite particles in the negative electrode conductive network. Then through carbon coating and zirconium nitride coating, the final 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 main negative electrode active material 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, silicon-based anode materials have also been developed, wherein the theoretical specific capacity of silicon-based anode materials is as high as 4200mAh / g, but its application prospects are still not optimistic due to its large volu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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