Silicon-carbon composite material for lithium ion battery and preparation method thereof

A technology of silicon-carbon composite materials and lithium-ion batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of not fully reflecting the high capacity of silicon-based materials, achieve improved cycle performance, prevent pulverization, and improve cycle performance. performance effect

Active Publication Date: 2013-01-23
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing literature, the specific capacity of most reported composite materials drops below 450 mAh / g after cycling for dozens of weeks, which cannot fully reflect the high capacity characteristics of silicon-based materials.

Method used

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  • Silicon-carbon composite material for lithium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Pour 0.2kg sodium carboxymethyl cellulose and 20L water into a blender, and stir at high speed for 2 hours to obtain sodium carboxymethyl cellulose glue.

[0014] 2. Pour the glue solution into a mechanical high-energy ball mill, and at the same time put 8kg of spherical artificial graphite with a particle size of D50=11-13μm and a purity of 99.96%, and 2kg of silicon powder with a particle size of D50=4-5μm and a purity of 99.99%. The softening point of 0.1kg is The low-temperature asphalt at 80°C is poured into a mechanical high-energy ball mill, and ball milled for about 3 hours under the protection of an argon atmosphere, and the particle size of the material is detected to be below 100nm.

[0015] 3. Put the ball-milled slurry into a centrifugal spray dryer, spray dry and granulate by centrifugal spraying at 150°C, and test the particle size and specific surface area of ​​the particles. The particle size is D50=15-19μm, and the specific surface area is below 4m2 / ...

Embodiment 2

[0037] 1. Pour 0.2kg sodium carboxymethyl cellulose and 20L water into a blender, and stir at high speed for 2 hours to obtain sodium carboxymethyl cellulose glue.

[0038] 2. Pour the glue into a mechanical high-energy ball mill, and at the same time put 6kg of spherical artificial graphite with a particle size of D50=11-13μm and a purity of 99.95%, and 4kg of silicon powder with a particle size of D50=4-5μm and a purity of 99.99%. The softening point of 0.1kg is The low-temperature asphalt at 80°C is poured into a mechanical high-energy ball mill, and ball milled for about 3 hours under the protection of an argon atmosphere, and the particle size of the material is detected to be below 100nm.

[0039] 3. Put the ball-milled slurry into a centrifugal spray dryer, spray dry and granulate by centrifugal spraying at 150°C, and test the particle size and specific surface area of ​​the particles. The particle size is D50=15-19μm, and the specific surface area is below 4m2 / g That's...

Embodiment 3

[0053] 1. Pour 0.2kg sodium carboxymethyl cellulose and 20L water into a blender, and stir at high speed for 2 hours to obtain sodium carboxymethyl cellulose glue.

[0054] 2. Pour the glue solution into a mechanical high-energy ball mill, and at the same time, mix 8kg of microcrystalline graphite with a particle size of D50=11-13μm and a purity of 99.95%, and 2kg of silicon powder with a particle size of D50=4-5μm and a purity of 99.99%. The softening point of 0.1kg is The low-temperature asphalt at 80°C is poured into a mechanical high-energy ball mill, and ball milled for about 3 hours under the protection of an argon atmosphere, and the particle size of the material is detected to be below 100nm.

[0055] 3. Put the ball-milled slurry into a centrifugal spray dryer, spray dry and granulate by centrifugal spraying at 150°C, and test the particle size and specific surface area of ​​the particles. The particle size is D50=15-19μm, and the specific surface area is below 4m2 / g ...

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Abstract

The invention discloses a silicon-carbon composite material for a lithium ion battery and a preparation method for the silicon-carbon composite material, and belongs to the field of lithium ion batteries. The silicon-carbon composite material is characterized in that carboxymethylcellulose sodium is used as a bonding agent, a liquid phase coating technology is used for silicon-carbon compounding, and a spray drying technology is used for drying granulation to prepare the silicon-carbon composite material with uniform granularity and excellent performance for the lithium ion battery. The silicon-carbon composite material and the preparation method thereof have the advantages that 1, the composite material for the lithium ion battery is prepared through a silicon-carbon compounding technology, and the capacity of the composite material is higher than that of the conventional graphite cathode material, reaches over 500mAh / g, and can meet requirements on the growing of the market of lithium ion batteries; 2, carboxymethylcellulose is used as a bonding agent which can be effectively coated and bonded on the silicon-carbon material to prevent efflorescence caused by silicon during charging and discharging, so that the cycling performance of the silicon-carbon composite material is effectively improved; and 3, the liquid phase coating and spray drying granulation technologies are adopted, so that the silicon-carbon material can be uniformly coated and bonded, has uniform granules, and is small in specific area, and the cycling performance of the silicon-carbon composite material is further improved.

Description

[0001] technical field [0002] The invention relates to a negative electrode material for a lithium ion battery and a preparation method thereof, in particular to a silicon-carbon composite material for a lithium ion battery and a preparation method thereof. Background technique [0003] Lithium-ion batteries have become a research hotspot in the field of new energy due to their high operating voltage, high energy density, and low environmental pollution. The anode materials of current commercial lithium-ion batteries are generally carbon materials, which have low and stable working potential and good cycle performance, but the specific capacity of carbon materials is low (for example, the theoretical specific capacity of graphite is 372mAh / g), which limits Its application as a high-energy-density power source is highlighted. Silicon has attracted widespread attention due to its large theoretical specific capacity (4200mAh / g) and low lithium intercalation potential. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 罗建伟刘小虹黄雨生吴壮雄
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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