Preparation method of porous long-circulation silicon carbon negative electrode material

A negative electrode material, long-cycle technology, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve the problems of difficult commercialization and poor long-term cycle performance of materials, and is conducive to large-scale production, improving Electrically conductive, environmentally friendly effect

Inactive Publication Date: 2018-01-23
赣州市瑞富特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the silicon-carbon anode material can relieve the pulverization and shedding of the active material during the charging and discharging process to a certain extent, and the volume expansion effect has been improved, the coatin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a porous long-cycle silicon-carbon negative electrode material in this example includes the following steps.

[0025] (1) Put silicon monoxide and methylpyrrolidone in a planetary ball mill, in which the solid content of silicon monoxide is 60wt%, and perform wet ball milling at a speed of 400r / min for 18 hours. o C and dried for 10 hours to obtain nano-scale silicon monoxide powder.

[0026] (2) Put the nano silicon monoxide powder, methylpyrrolidone and modified asphalt treated in step (1) in a high-speed mixer at a mass ratio of 5:5:1 for liquid phase coating, and stir at a speed of 1000r / min 5h, then at 130 o C and dried for 8 hours and made into powder.

[0027] (3) Put the powder obtained in step (2) into an argon atmosphere furnace for carbonization treatment, with 10 o C / min heating rate up to 1000 o C and keep it warm for 8h to obtain the precursor powder.

[0028] (4) Put the precursor powder obtained in step (3) and modified pitch,...

Embodiment 2

[0032] A method for preparing a porous long-cycle silicon-carbon negative electrode material in this example includes the following steps.

[0033] (1) Put silicon monoxide and absolute ethanol in a planetary ball mill, in which the solid content of silicon monoxide is 30wt%, and perform wet ball milling at a speed of 300r / min for 16h, after ball milling at 100 o C and dried for 9 hours to obtain nano-scale silicon monoxide powder.

[0034] (2) Put the nano silicon monoxide powder, absolute ethanol and sucrose treated in step (1) in a high-speed mixer at a mass ratio of 3:8:1 for liquid phase coating, and stir for 4 hours at a speed of 900r / min. then at 100 o C and dried for 8 hours and made into powder.

[0035] (3) The powder obtained in step (2) was placed in a nitrogen atmosphere furnace for carbonization treatment, with 10 o C / min heating rate increased to 800 o C and keep it warm for 4h to obtain the precursor powder.

[0036] (4) Place the precursor powder obtained...

Embodiment 3

[0040] A method for preparing a porous long-cycle silicon-carbon negative electrode material in this example includes the following steps.

[0041] (1) Put silicon monoxide and distilled water in a planetary ball mill, in which the solid content of silicon monoxide is 50wt%, and perform wet ball milling at a speed of 300r / min for 18h, and after ball milling, grind at 110 o C and dried for 4 hours to obtain nano-scale silicon monoxide powder.

[0042] (2) Put the nano-silicon monoxide powder, distilled water and glucose treated in step (1) in a high-speed mixer at a mass ratio of 8:10:1 for liquid phase coating, stir at a speed of 800r / min for 6h, and then 110 o C conditions for 10h and made into powder.

[0043] (3) The powder obtained in step (2) was placed in a nitrogen atmosphere furnace for carbonization treatment, with 10 o C / min heating rate up to 900 o C and keep it warm for 5h to obtain the precursor powder.

[0044] (4) Put the precursor powder obtained in step (...

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Abstract

The invention discloses a preparation method of a porous long-circulation silicon carbon negative electrode material. The preparation method comprises the following steps of (1) performing ball milling on silicon monoxide until the obtained material is in nano scale; (2) coating the nanometer silicon monoxide with a carbon source in a liquid phase coating manner, and next, drying into powder; (3)putting the powder obtained in the step (2) into an atmosphere furnace to be subjected to carbonization treatment to obtain precursor powder; (4) performing secondary liquid phase coating on the precursor powder obtained in the step (3) and the carbon source and a conductive agent, and then drying into powder; (5) putting the powder obtained in the step (4) into an atmosphere furnace to be subjected to carbonization treatment again; and (6) putting the powder obtained in the step (5) into hydrofluoric acid to be soaked, and then performing filtering and washing by distilling water until the solution is neutral, and performing drying at a temperature of 90-150 DEG C to obtain powder to obtain the porous long-circulation silicon carbon negative electrode material. By virtue of the preparation method, the initial Coulomb effect and the cycle performance of the negative electrode material can be improved effectively, and meanwhile, simple process, environmental protection property, and facilitation of scale production can be realized.

Description

technical field [0001] The invention relates to the technology in the field of lithium batteries, and in particular provides a method for preparing a porous and long-cycle silicon-carbon negative electrode material. Background technique [0002] The development history of lithium-ion batteries since 1990, lithium-ion batteries have become the main choice of power supply for portable electronic devices (such as mobile phones, digital cameras and portable notebooks), and are more and more widely used in electric vehicles, hybrid electric vehicles, In many fields such as large-scale energy storage, space technology, and national defense industry, the capacity and energy density of batteries need to be greatly improved to meet the needs of various fields. At present, commercial lithium-ion batteries mainly use modified natural graphite and artificial graphite as anode materials, but their theoretical specific capacity is 372mA / g. Therefore, people have high expectations for new ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/052
CPCY02E60/10
Inventor 胡美萍韩峰韩少峰孙玉治杨栋梁彭渊敏
Owner 赣州市瑞富特科技有限公司
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