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Lithium ion battery silicon-carbon composite negative material and its preparation method

A lithium-ion battery and silicon-carbon composite technology, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of cumbersome preparation process, high raw material cost, and low production efficiency, shorten the diffusion path, reduce production cost, reduce Process effect

Active Publication Date: 2015-02-04
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the composite material is cumbersome, the raw material cost is high, and the production efficiency is low

Method used

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  • Lithium ion battery silicon-carbon composite negative material and its preparation method
  • Lithium ion battery silicon-carbon composite negative material and its preparation method
  • Lithium ion battery silicon-carbon composite negative material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Stirring and dispersing mixing:

[0050] Add 30 parts of graphene and 60 parts of nano-silica powder into the solvent, stir or ultrasonically disperse it evenly, mix and stir at room temperature for 4 minutes, and then use a sand mill to grind and disperse 3 times; wherein, the solvent for water.

[0051] (2) Coating granulation:

[0052] Add the mixture prepared in step (1) into the atomizer 11 of the self-made equipment 10, turn on the power supply of the high-temperature furnace 12 of the self-made equipment 10, and open the protective gas. The protective gas is argon, and the temperature is raised to 1000 in the protective gas. ℃, and high-temperature annealing treatment, the temperature of high-temperature annealing treatment is 900 ℃, then 10 parts of gaseous carbon sources are loaded by the protective gas, the gas flow rate is 500ml / min, and the atomizer 11 is turned on at the same time, and the protective gas will flow into the atomizer 11 The atomized fin...

Embodiment 2

[0054] (1) Stirring and dispersing mixing:

[0055] Add 14 parts of graphene and 62 parts of nano-silica powder into the solvent, stir or ultrasonically disperse it evenly, mix and stir at room temperature for 5 minutes, and then use a sand mill to grind and disperse 3 times; wherein, the solvent to methanol.

[0056] (2) Coating granulation:

[0057] Add the mixture prepared in step (1) into the atomizer 11 of the self-made equipment 10, turn on the power supply of the high-temperature furnace 12 of the self-made equipment 10, and turn on the protective gas. The protective gas is helium, and the temperature is raised to 900 in the protective gas. ℃, and high-temperature annealing treatment, the temperature of high-temperature annealing treatment is 800 ℃, and then 24 parts of liquid carbon sources are loaded by the protective gas, the gas flow rate is 400ml / min, and the atomizer 11 is turned on at the same time, and the protective gas will flow into the atomizer 11 The atom...

Embodiment 3

[0059] (1) Stirring and dispersing mixing:

[0060] Add 22 parts of graphene and 63 parts of nano-silica powder into the solvent, stir or ultrasonically disperse it evenly, mix and stir at room temperature for 3 minutes, and then use a sand mill to grind and disperse 2 times; wherein, the solvent for ethylene glycol.

[0061] (2) Coating granulation:

[0062] Add the mixture prepared in step (1) into the atomizer 11 of the self-made equipment 10, turn on the power supply of the high-temperature furnace 12 of the self-made equipment 10, and turn on the protective gas, which is a mixed gas of argon and hydrogen. The volume percentage of hydrogen in the mixed gas is 30%, and the temperature is raised to 900°C in the protective gas, and high-temperature annealing treatment is performed. The temperature of the high-temperature annealing treatment is 700°C, and then 15 parts of gaseous carbon sources are loaded into the protective gas. 300ml / min, turn on the atomizer 11 at the sam...

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Abstract

The invention discloses a lithium ion battery silicon-carbon composite negative material and its preparation method. A one-step coating granulation technology is adopted to disperse nanometer silicon powder in a three-dimensional conductive network formed by graphene in order to maintain close contact between the nanometer silicon powder and graphene, shorten the diffusion path of lithium ions and ensure no deprivation of electron conduction of the electrode material. Graphite with very high toughness can buffer the volume expansion of silicon in the charge and discharge process, and amorphous carbon formed through gas phase coating can maintain the stable structure of the material, so the lithium ion battery silicon-carbon composite negative material has excellent cycle performances and rate performances. The preparation method of the lithium ion battery silicon-carbon composite negative material has the advantages of simplicity, high efficiency, few steps and high yield, is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials and preparation methods thereof, and in particular relates to a lithium-ion battery silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] In the past ten years, with the wide application and rapid development of various portable electronic devices and electric vehicles, the demand and performance requirements for its power system: chemical power supply have increased sharply. Lithium-ion batteries have been successful and widely used due to their high power characteristics Applied in the field of mobile electronic terminal equipment. At present, commercial lithium-ion secondary batteries generally use various carbon materials as negative electrodes, mainly graphitized carbon and amorphous carbon, such as natural graphite, modified graphite, graphitized mesocarbon microspheres, soft carbon (such as coke) and some hard carbo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/134H01M4/62H01M4/04
CPCH01M4/134H01M4/362H01M4/62H01M4/628Y02E60/10
Inventor 宋宏芳赵东辉戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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