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A lithium ion battery silicon carbon composite material and its preparation method

A silicon-carbon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high preparation cost, increased side reactions, increased electrical conductivity, etc., and achieves simple operation process and reduced volume change. , the effect of high electrochemical capacity

Active Publication Date: 2021-03-05
TIANNENG BATTERY GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although these silicon-based negative electrode materials alleviate the volume expansion and contraction effects that occur when the silicon material itself intercalates and delithiates lithium to a certain extent, due to its large specific surface area, it will be exposed to the electrolyte during cycling and in contact with the electrolyte. Consumes a large amount of lithium ions, which leads to an increase in side reactions and a decrease in Coulombic efficiency, thereby reducing cycle performance and capacity retention; on the other hand, these single silicon-carbon, silicon-metal and other composite materials cannot completely solve the problem of silicon The problems existing in the material, either the volume expansion effect cannot be completely solved, or the electrical conductivity needs to be improved, or the preparation cost is high, which affects its practical application

Method used

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  • A lithium ion battery silicon carbon composite material and its preparation method
  • A lithium ion battery silicon carbon composite material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0040] First, the silicon dioxide raw material diatomite and magnesium powder are ball-milled on a ball mill at a molar ratio of 1:2, and then the ball-milled mixture is soaked in hydrochloric acid, then washed with deionized water, ethanol, etc., separated, and dried Then get nano-silicon.

[0041] Then add 0.2g of synthesized nano-silicon powder particles with a particle size of 50nm, 0.2g of graphite, and 0.1g of ferric nitrate into the aqueous solution of glucose with a concentration of 0.2M, and ultrasonically disperse for 30min to form a uniform suspension. or solution; then put the three solutions together and continue mixing evenly.

[0042] Secondly, the mixed solution obtained above is sprayed and cracked at 200° C. by spray drying method to obtain the primary product of Si-C-M composite material;

[0043] Then, 0.2g of the above Si-C composite material and 0.05g of asphalt were dispersed in tetrahydrofuran by ultrasonic for 90min to form a uniform suspension, and t...

Embodiment 2

[0046] First, the silicon dioxide raw material porous molecular sieve and the lithium block are ball-milled on a ball mill at a molar ratio of 1:2, and then the ball-milled mixture is soaked in sulfuric acid, then washed with deionized water, ethanol, etc., separated, and dried Get nano silicon.

[0047] Then add 0.2g of synthesized nano-silicon powder particles with a particle size of 100nm, 0.2g of graphite, and 0.1g of copper nitrate to the aqueous solution of citric acid with a concentration of 0.2M, and ultrasonically disperse for 30min to form a uniform suspension. liquid or solution; then put the three solutions together and continue mixing evenly.

[0048] Secondly, the mixed solution obtained above is sprayed and cracked at 500° C. by spray drying method to obtain the primary product of Si-C-M composite material;

[0049] Then, 0.2 g of the above-mentioned Si-C-M composite primary product and 0.05 g of polyacrylonitrile were dispersed in ethanol by ultrasonic for 90 ...

Embodiment 3

[0052] First, the silica raw material quartz stone and sodium block are ball-milled on a ball mill at a molar ratio of 1:2, and then the ball-milled mixture is soaked in hydrochloric acid, then washed with deionized water, ethanol, etc., separated, and dried Get nano silicon.

[0053] Then add 0.2g of synthesized nano-silicon powder particles with a particle size of 200nm, 0.2g of graphite, and 0.1g of manganese nitrate to the aqueous solution of 0.2M sucrose, and ultrasonically disperse for 30min to form a uniform suspension. or solution; then put the three solutions together and continue mixing evenly.

[0054] Secondly, the mixed solution obtained above is sprayed and cracked at 700° C. by spray drying method to obtain the primary product of Si-C-M composite material;

[0055] Then, 0.2g of the above-mentioned Si-C composite primary product and 0.05g of epoxy resin were dispersed in ethanol by ultrasonic for 90min to form a uniform suspension, and then vacuum-dried at 80°C...

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Abstract

The invention discloses a lithium-ion battery silicon-carbon composite material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. The composite material includes: composite particles containing nano-silicon, carbon material, nano-inert metal or metal silicide, and a carbon layer coated on the surface of the composite particle, and the composite material is a porous secondary structure with a micron size , prepared by mixing nano-silicon, carbon materials, metal salts and organic carbon source solution, spray pyrolysis and sintering carbonization. The composite material can give full play to the synergistic effect of silicon, carbon and metal materials. The electrochemical capacity of the silicon material is high, the carbon material increases the conductivity, and the inert metal or metal silicide can further increase the conductivity and reduce the volume change; the porous secondary The structure effectively increases the tap density and accommodates the volume expansion of silicon to relieve mechanical stress.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a silicon-carbon composite material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Due to their good charge-discharge cycle stability, graphitic carbon anode materials are still widely used in commercial lithium-ion batteries, but their theoretical capacity is very limited (372mAh / g). With the development of consumer electronics and electric vehicles, people have higher and higher requirements for the energy density of lithium-ion batteries, which urgently requires the development of new high-capacity lithium-ion battery anode materials. Among all kinds of new lithium storage anode materials, silicon has the highest theoretical capacity (4212mAh / g); at the same time, silicon-based anode materials also have the advantages of wide sources, low price, low lithium intercalation potential, and no toxicity. Therefore, silicon is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/626H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 毛建锋郭再萍孙伟赵海敏何文祥周翠芳
Owner TIANNENG BATTERY GROUP
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