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A kind of preparation method of negative electrode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity, volume expansion and crushing, and poor rate performance of carbon materials, and achieves increased capacity, improved electronic conductivity, The effect of improving structural stability

Inactive Publication Date: 2019-11-19
宁夏西墨新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the further application of carbon materials is restricted by the poor rate performance and low capacity of carbon materials. At the same time, its poor electrical conductivity, volume expansion and pulverization in the cycle process, and reduced electrical contact seriously restrict the commercialization of silicon-based negative electrode materials. Application problem, a preparation method of lithium-ion battery negative electrode material is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Take the discarded silicate glass, wash it with clean water, dry it naturally and place it in a ball mill jar, add a 0.8mol / L sodium chloride solution of 10% silicate glass mass, and ball mill it at a speed of 450r / min for 2h. Pass through a 100-mesh sieve to obtain ball-milled silicate glass powder; take the same quality of gum arabic and gum tragacanth, put them in a ball mill jar, and mill them at a speed of 500r / min for 3 hours. 100-mesh sieve to get tragacanth and gum arabic mixture powder; according to the mass ratio of 1:2, mix the waste silicate glass ball mill powder and gum arabic and gum tragacanth powder, and add 250 zinc of 5% silicate glass quality powder, using a mixer at a speed of 150r / min to continuously stir for 30 minutes to obtain a uniformly mixed colloidal powder mixture; fill the prepared colloidal powder mixture into a tablet mold, press at room temperature at 5MPa, and hold the pressure for 2 minutes , demolded and placed in an oven at 80°C. Af...

example 2

[0025] Take the discarded silicate glass, wash it with clean water, dry it naturally and place it in a ball mill jar, add a 0.8mol / L sodium chloride solution of 10% silicate glass mass, and ball mill it at a speed of 470r / min for 2.5h , passed through a 100-mesh sieve to obtain ball-milled silicate glass powder; take the same quality of gum arabic and tragacanth, put them in a ball mill jar, and mill them for 3 hours at a speed of 525r / min. After the ball milling is over, take out the ball mill powder and Pass through a 100-mesh sieve to obtain the mixture powder of gum tragacanth and gum arabic; mix waste silicate glass ball mill powder with gum arabic and gum tragacanth powder in a mass ratio of 1:2, add 270% silicate glass mass Use a mixer to continuously stir the zinc powder at a speed of 165r / min for 30 min to obtain a uniformly mixed colloidal powder mixture; fill the colloidal powder mixture prepared by z into a sheet mold, and press it with 7MPa at room temperature to k...

example 3

[0027] Take the discarded silicate glass, wash it with clean water, dry it naturally and place it in a ball mill jar, add a 0.8mol / L sodium chloride solution of 10% silicate glass mass, and ball mill it at a speed of 500r / min for 3h. Pass through a 100-mesh sieve to obtain ball-milled silicate glass powder; take the same quality of gum arabic and tragacanth, put them in a ball mill jar, and mill them at a speed of 550r / min for 4 hours. 100-mesh sieve to get tragacanth and gum arabic mixture powder; according to the mass ratio of 1:2, mix the waste silicate glass ball mill powder with gum arabic and gum tragacanth powder, and add 300 mesh of 5% silicate glass quality For zinc powder, use a mixer to continuously stir for 30 minutes at a speed of 180r / min to obtain a uniformly mixed colloidal powder mixture; fill the prepared colloidal powder mixture into a sheet mold, press at 10MPa at room temperature, and hold the pressure for 3min Finally, demold and place in an oven at 100°C...

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Abstract

The invention relates to a preparation method for a lithium ion battery negative electrode material, and belongs to the technical field of a lithium ion battery. The preparation method comprises the steps of taking and placing silicate glass in a ball-milling tank, adding a sodium chloride solution for ball-milling, and sieving to obtain silicate glass powder; taking and placing Arabic gum and tragacanth gum in the ball-milling tank for ball-milling, and sieving to obtain tragacanth gum and Arabic gun mixture power; mixing the silicate glass ball-milling powder, the Arabic gum and the tragacanth gum, adding zinc powder, and performing stirring to obtain a colloid powder mixture; filling the colloid powder mixture in a die, performing pressing and pressure preservation, placing the die in abaking box, and performing standing and cooling to a room temperature after thermal curing to obtain a cured material; and placing the cured material in a tubular atmosphere furnace, introducing nitrogen to remove air, controlling a temperature, performing heat preservation and carbonization, and performing standing and cooling to the room temperature, thereby obtaining a silicon carbon compositenegative electrode material. The obtained negative electrode material has good rate performance, high capacity and good conductivity, and the application of the silicon negative electrode material isexpanded by electrical contact.

Description

[0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] In the 21st century, with the development of economy and society, people's demand for energy continues to increase. But the pollution generated by the increase of energy demand has become the main source of environmental pollution. At the same time, more and more countries in the world realize that in order to establish a society that can meet the needs of the current society without endangering the survival and development of future generations, it is necessary to vigorously develop green energy such as new energy and renewable energy to reduce environmental pollution. Green power is one of the important directions of green energy. Therefore, green and safe lithium-ion batteries have attracted widespread attention. [0003] At present, lithium-ion batteries have superior perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 刘滨赵宝史玉兰
Owner 宁夏西墨新材料科技有限公司
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