High-energy silicon-carbon composite negative electrode material for lithium ion battery and manufacturing process thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of high production cost, difficulty in large-scale commercial use, and unsatisfactory properties, and achieves improved coating uniformity and spherical integrity. The effect of improving cycle stability and long charge-discharge platform

Inactive Publication Date: 2010-05-19
DALIAN LICHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for creating a type of cathodic electrode (CE) material called SiC/graphene composites by applying certain materials onto small particles made from pure crystalline carbon. These specialized structures help increase their energy density compared to traditional batteries while maintaining good electrical properties like conductivity and durability over time. Additionally, they have improved cyclabilities due to strong magnets used during charging and discharges. Overall, this new design results in longer lifetimes and better overall performance of these types of cells

Problems solved by technology

This patents discusses different types of carbon composites that could potentially improve the properties of Li ion batteries (LIB). Silicone carboxylic acid coating was found effective at improving cycling behavior while also enhancing storage capacities without losing any significant amount of charge during charging cycles. Additionally, nanosized silica particles were discovered to increase conductivity when combined with graphene oxide layers, resulting in better cyclability compared to pure silane. These improvements resulted in increased overall efficiency and durable lifespan of LIB devices made from them.

Method used

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  • High-energy silicon-carbon composite negative electrode material for lithium ion battery and manufacturing process thereof
  • High-energy silicon-carbon composite negative electrode material for lithium ion battery and manufacturing process thereof
  • High-energy silicon-carbon composite negative electrode material for lithium ion battery and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The equipment composition of this example is as attached figure 1 shown. The whole set of equipment is connected through pipelines and is in a fully sealed state. Among them, the nano-grinding machine is DRAIS PML-H / V universal nano-grinding machine.

[0035] First, 20 kg of monocrystalline silicon powder is put into the high-temperature reactor 6, and the high-temperature reactor is filled with a mixed gas of helium, neon, and argon. rate, heated for 4 hours, and the temperature in the high-temperature reactor was raised to 400°C. Monocrystalline silicon powder is dried in a high-temperature reactor, and a very small amount of pollutants are also burned clean. After 4 hours of heating, cool the high-temperature reactor to 240°C, which is close to but not more than the softening point of the nano-scale mesophase pitch, so that the single crystal silicon powder can be mixed with the sprayed nano-scale mesophase pitch droplets. Better mix coverage.

[0036] Simultane...

Embodiment 2

[0042] The drying of silicon powder in this embodiment, the formation and semi-liquidization of nano-scale mesophase pitch, the mixing and coating of nano-scale mesophase pitch and silicon powder are the same as in Example 1, but when the coated silicon powder is carbonized , the carbonization temperature is 1300°C, and the graphitization temperature is 3000°C. The obtained coated silicon powder is used as a negative electrode material for secondary batteries, and its initial charge capacity (mAh / g) is 1180.77, and its initial discharge capacity (mAh / g) is 1126.38 , 500 cycle capacity retention was 81.7%.

Embodiment 3

[0044] The equipment composition of this example is as attached figure 2 shown.

[0045] First put 80 kg of spherical graphite with a purity of 99.999% and 10 kg of silicon powder with a purity of 99.9% into the mixer, mix thoroughly for 3 hours, then put the mixture into the high-temperature reactor 6, and fill the high-temperature reactor with helium, neon and argon. Gas, the stirring speed of the high-temperature reactor is 200 rpm, and the temperature in the high-temperature reactor is raised to 400°C by heating at a rate of 100°C per hour for 4 hours. The mixture is dried in a high-temperature reactor, and very small amounts of pollutants are burned clean. After 4 hours of heating, cool down the high-temperature reactor to 240°C, which is close to but not more than the softening point of the nano-scale mesophase pitch, so that the mixture substrate can be compared with the sprayed nano-scale mesophase pitch droplets. Good mixed coating.

[0046] Simultaneously with th...

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Abstract

The invention relates to a high-energy silicon-carbon composite negative electrode material for a lithium ion battery and a manufacturing process thereof. The negative electrode material takes silicon powder or a mixture of the silicon powder and graphite powder as a core material, takes pyrolytic carbon as a shell material, and uses the shell material to coat the core material. The process for manufacturing the negative electrode material provided by the invention is characterized by performing nanoscale processing on mesophase pitch, ensuring that the nanoscale mesophase pitch is in a semi-liquid state, spraying the semi-liquid nanoscale mesophase pitch to the surface of a substrate of the silicon powder or the surface of a substrate of the mixture of the silicon powder and the graphite powder through a nanometer spraying device to realize the uniform coating, and finally obtaining a negative electrode material for a secondary battery through conventional drying, carbonization and graphitization processes (a high-strength magnetic field is applied during the carbonization and the graphitization). The specific capacity of high-energy silicon-carbon battery powder manufactured by the process can reach more than 1,050mAh/g, and over 80 percent of capacity can still be maintained after the circulation for 500 times.

Description

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Claims

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Application Information

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Owner DALIAN LICHANG NEW MATERIAL CO LTD
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