Preparation method of silicon-based negative electrode material for lithium-ion batteries

A silicon-based negative electrode material and lithium-ion battery technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as low compaction density and decreased volumetric energy density of batteries, achieve low manufacturing costs, and improve electrochemical performance. Improvement in performance and electrical contact

Inactive Publication Date: 2019-08-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to buffer the expansion of nano-silicon and graphite, the compaction density of the material will be relatively low, which will lead to a decrease in the volumetric energy density of the cell

Method used

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  • Preparation method of silicon-based negative electrode material for lithium-ion batteries
  • Preparation method of silicon-based negative electrode material for lithium-ion batteries
  • Preparation method of silicon-based negative electrode material for lithium-ion batteries

Examples

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Embodiment 1

[0031] A method for preparing a silicon-based negative electrode material for a lithium-ion battery, specifically comprising the following steps:

[0032] (1) Add an appropriate amount of pore-forming agent to needle coke (the precursor of artificial graphite), and after high-temperature graphitization (the average particle size D50 of graphite is 15 microns), pores with a depth of about 1 micron are formed on the surface;

[0033] (2) Weigh 9.5 kg of graphite prepared in step (1), and place it in a roller mill jar with 0.5 kg of silicon with an average particle diameter D50 of 81 nanometers, add an appropriate amount of zirconium balls, and mill for 2 hours;

[0034] (3) Weigh 9.5kg of the material obtained in step (2), fully mix it with 1.0kg of low-temperature asphalt, and place it in a rotary tube furnace, inject nitrogen gas at high temperature, and fully decoke at 300-500°C , and then carbonized at 800-1000 ° C, after the reaction is completed, it is cooled to room tempe...

Embodiment 2

[0043] A method for preparing a silicon-based negative electrode material for a lithium-ion battery, specifically comprising the following steps:

[0044] (1) Use hydrogen-containing plasma to anisotropically etch the surface of natural graphite (average particle size D50 is 12 microns), forming multiple regular hexagonal holes on the graphite surface, with an etching depth of about 0.1 microns ;

[0045] (2) Weigh 4.95 g of the graphite prepared in step (1), put it in a planetary ball mill jar with 0.05 g of silicon with an average particle diameter D50 of 36 nanometers, add an appropriate amount of zirconium balls, and mill for 1 hour;

[0046] (3) Weigh the material obtained in step (2) and place it in a rotary tube furnace, raise the temperature to 950°C according to a certain program, keep it warm for 2 hours under an appropriate amount of acetylene / nitrogen (according to a certain ratio), and then pass in nitrogen After cooling down to room temperature, it is a silicon-...

Embodiment 3

[0048] A method for preparing a silicon-based negative electrode material for a lithium-ion battery, specifically comprising the following steps:

[0049] (1) Add an appropriate amount of pore-forming agent to the needle coke, and after high-temperature graphitization (the average particle size D50 of graphite is 17 microns), pores with a depth of about 3 microns will be formed on the surface;

[0050] (2) Weigh 4.75 g of the graphite prepared in step (1), put it in a planetary ball mill jar with 0.25 g of silicon with an average particle diameter D50 of 65 nanometers, add an appropriate amount of zirconium balls, and mill for 1 hour;

[0051] (3) Weigh the material obtained in step (2) and place it in a rotary tube furnace, raise the temperature to 950°C according to a certain program, keep it warm for 2 hours under an appropriate amount of acetylene / nitrogen (according to a certain ratio), and then pass in nitrogen After cooling down to room temperature, it is a silicon-base...

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Abstract

The invention discloses a preparation method of a silicon-based negative electrode material for lithium-ion batteries, which comprises the steps of firstly, etching the surface of a carbon material byadopting a physical or chemical method, and forming multiple nano-scale to micron-scale holes on the surface of the carbon material; then mixing and ball-milling the carbon material with holes with acertain proportion of nano-silicon, and embedding the nano-silicon into the holes of the carbon material; and finally, carrying out carbon coating on the mixed and ball-milled material to obtain thesilicon-based negative electrode material for the lithium-ion batteries. The volume expansion of silicon can be greatly buffered by graphite, and good electrical contact is kept between silicon and graphite, so that the silicon-based negative electrode material prepared according to the invention greatly improves the electrochemical performance; and meanwhile, the hole prepared on the surface of graphite can greatly improve the lithium intercalation reaction of lithium ions on the graphite substrate, so that the material greatly improves the rate and low temperature performance of the lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for preparing a silicon-based negative electrode material for a lithium-ion battery. Background technique [0002] With the development of lithium-ion battery technology, the application range of lithium-ion batteries is also expanding. Since Sony first commercialized lithium-ion batteries in 1991, lithium-ion batteries have gradually become the mainstream power source for consumer electronics. In recent years, the application range of lithium-ion batteries has expanded to high-power and high-energy applications such as electric tools, electric / hybrid vehicles, and energy storage power stations. As such expansion proceeds, existing graphite-based anode materials will not be able to meet the power density and energy density requirements of Li-ion batteries in the foreseeable future. Therefore, looking for next-generation anode materials for lithium-ion batteries tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395
CPCH01M4/1395Y02E60/10
Inventor 林少雄陆大班许家齐周勇岐王辉丁楚雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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