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High-performance silicon-carbon negative electrode material and preparation method thereof

A negative electrode material and high-performance technology, applied in the field of high-performance silicon carbon negative electrode material and its preparation, can solve the problems of low specific capacity of graphite negative electrode, poor conductivity due to volume change, hindering large-scale use, etc. The effect of capacity, good lithium ion intercalation and deintercalation ability

Inactive Publication Date: 2021-08-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the current market’s admiration for high-endurance vehicles, graphite anodes cannot meet the demand due to their low specific capacity (372mAh / g).
Silicon-based materials emerged at the historic moment, and the excellent theoretical capacity of silicon (4200mAh / g) is considered to be the most powerful competitor for the next-generation anode material, but its inherent defects hinder its large-scale use: the volume of silicon during charge and discharge Changes and poor electrical conductivity also complicate the application of silicon-based materials. At present, in addition to reducing volume expansion through nanonization, a framework is also used to limit the volume expansion and agglomeration of silicon, and through this framework to improve the composite material itself electrochemical performance

Method used

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  • High-performance silicon-carbon negative electrode material and preparation method thereof
  • High-performance silicon-carbon negative electrode material and preparation method thereof
  • High-performance silicon-carbon negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of silicon carbon negative electrode materials:

[0030] 1) 1 g of spherical graphite is placed in a 7 mol / L of potassium hydroxide solution, stirred for 8 h; after drying at 80 ° C, the mixture is mixed at a temperature of 2 h at a nitrogen atmosphere of 800 ° C, washed with water and dry at 80 ° C to obtain etching graphite materials. ;

[0031] 2) The etchaven graphite was mixed in a 30 ml of ethanol solution, and 1.5 ml of ammonia was continuously stirred, then 2 g of orthosilicate was added and stirred for 3 h, after film finishing, dried, sollable gel product;

[0032] 3) Add a sol gel product and 10 g sodium chloride to 15 ml of deionized water, stirred and evaporated, mixed with 5 g of aluminum powder, heated at 700 ° C in argon, after 2 mol / L hydrochloride was washed filtrate, 80 ° C Drying, aluminum thermally reactive product;

[0033] 4) In the ethanol solution of the aluminum thermal reaction product, the graphite and the phenolic resin is 1: 0.5...

Embodiment 2

[0037] Preparation of a silicone carbon aperture material: Step 1) In the 4 mol / L of potassium hydroxide solution in step 1, 1 g of spherical graphite is used; other as in Example 1.

[0038] Assembly battery: in Example 1. Test electrochemical properties, the results are shown in Table 1.

Embodiment 3

[0040] Preparation of a silicone carbon aperture material: Step 1) In the 10 mol / L of potassium hydroxide solution in step 1);

[0041] Assembly battery: in Example 1. Test electrochemical properties, the results are shown in Table 1.

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Abstract

The invention discloses a high-performance silicon-carbon negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery negative electrode materials. The preparation method comprises the following steps: adding graphite into an alkali solution, stirring, drying, carrying out high-temperature etching in an inert atmosphere, washing with water, and drying; adding the etched graphite and a catalyst into an ethanol solution, adding tetraethyl orthosilicate, carrying out a stirring reaction, washing, and drying to obtain a sol-gel product; adding a sodium chloride solution into the sol-gel product, stirring, drying, carrying out thermit reaction in an inert atmosphere, carrying out acid pickling, and drying; and dispersing the carbon precursor into a solvent, adding the thermit reaction product, stirring, drying, and carrying out high-temperature carbonization treatment to obtain the product. According to the invention, the etched graphite material is firstly used as a matrix, then a small amount of silicon material is loaded on the matrix by a sol-gel method, and a framework is constructed by carbon coating, so that the obtained material has good lithium ion intercalation and deintercalation capability, high capacity and good rate capability, and the preparation method is simple and low in cost.

Description

Technical field [0001] The present invention relates to the field of lithium ion battery negative electrode material, and more particularly to a high performance silicon carbon aperture material and a preparation method thereof. Background technique [0002] Vigorously develops renewable energy, gradually get rid of reliance on fossil energy, and is the only way to promote social sustainable development. Chemical storage capacity is the most potential energy storage device due to flexible, efficient and unfielder restriction characteristics. The lithium-ion battery is used as a high-band energy battery system, which has the advantages of long circulating life, environmentally friendly, mature production process, and has been rapidly developed in portable electronic products, power tools and electric vehicles. [0003] At present, the negative electrode of commercialized lithium-ion battery is basically used in graphite materials. The lithium ions are transmitted between graphite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525B82Y40/00B82Y30/00Y02E60/10
Inventor 鲁鹏薛兵王宇楠
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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