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Ferrosilicon composite negative electrode material and preparation method thereof

A negative electrode material, a technology of ferrosilicon alloy, applied in the field of ferrosilicon composite negative electrode material and its preparation, can solve the problems of low effective specific capacity, high cost of nanometerization, poor cycle performance, etc., to reduce the average particle size, improve the preparation efficiency, The effect of improving electrical conductivity

Pending Publication Date: 2022-07-05
HUI ZHOU BTR NEW MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the cycle performance of the silicon negative electrode is poor due to the large volume expansion during the charging and discharging process. At present, the silicon-carbon negative electrode material is mainly prepared by nanonization and carbon coating and composited with graphite, and has been applied industrially. However, the cost of nanonization of silicon High, the amount of silicon added is currently low
Ferrosilicon alloy can reduce volume expansion during charge and discharge, but due to poor conductivity, the effective specific capacity is low

Method used

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  • Ferrosilicon composite negative electrode material and preparation method thereof
  • Ferrosilicon composite negative electrode material and preparation method thereof
  • Ferrosilicon composite negative electrode material and preparation method thereof

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preparation example Construction

[0033] The present application provides a preparation method of ferrosilicon composite negative electrode material, comprising the following steps: adding ferrosilicon alloy to a solvent, and performing grinding and mixing operations to obtain ferrosilicon alloy slurry; adding conductive agent slurry and carbon source to the The ferrosilicon alloy slurry is dispersed and stirred to obtain a nano-mixed slurry; the nano-mixed slurry is spray-dried to obtain a spherical particle precursor; the carbon coating material is added to the spherical particle precursor , and a stirring and mixing operation is performed to obtain a carbon-coated ferrosilicon alloy; the carbon-coated ferrosilicon alloy is subjected to a carbonization operation to obtain the ferrosilicon composite negative electrode material.

[0034] In the preparation method of the above-mentioned ferrosilicon composite negative electrode material, ferrosilicon alloy is used as the negative electrode material, and the seco...

Embodiment 1

[0062] The ferrosilicon alloy was added to an ethanol solution with a liquid-solid ratio of 3:1, and ground in a sand mill for 2 hours to obtain a ferrosilicon alloy slurry. The average particle size of the particles in the slurry was 0.8 microns. 1% of carbon nanotube slurry and 5% of SBR are added to the slurry, and the mixture is uniformly dispersed for 1 hour with a vacuum high-speed dispersing mixer to obtain a uniformly dispersed nanometer mixed slurry. The nano-mixed slurry is spray-dried, and the inlet temperature of the spray-drying is adjusted to 220° C. and the outlet temperature is 80° C. to obtain spherical particle precursors. A mixture of coal tar pitch and N-methylpyrrolidone in a ratio of 20%: 80% is added to the ferrosilicon alloy precursor powder prepared in the above step, the weight ratio of the mixture to the alloy powder is 1:1, and the mixture is uniformly stirred and placed in an atmosphere furnace , dried at 200°C under argon protection, and then carb...

Embodiment 2

[0064] The ferrosilicon alloy was added to an ethanol solution with a liquid-solid ratio of 3:1, and ground in a sand mill for 2 hours to obtain a ferrosilicon alloy slurry. The average particle size of the particles in the slurry was 0.6 microns. 1.5% of carbon nanotube slurry and 10% of PVP are added to the slurry, and the mixture is uniformly mixed and dispersed for 1 hour with a vacuum high-speed dispersing mixer to obtain a uniformly dispersed nanometer mixed slurry. The nano-mixed slurry is spray-dried, and the inlet temperature of the spray-drying is adjusted to be 250° C. and the outlet temperature is 100° C. to obtain spherical particle precursors. A mixture of coal tar pitch and N-methylpyrrolidone in a ratio of 20%: 80% is added to the ferrosilicon alloy precursor powder prepared in the above step, the weight ratio of the mixture to the alloy powder is 1:1, and the mixture is uniformly stirred and placed in an atmosphere furnace , dried under argon protection at 200...

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Abstract

The invention provides a silicon iron composite negative electrode material and a preparation method thereof. The preparation method of the ferrosilicon composite negative electrode material comprises the following steps: adding ferrosilicon alloy into a solvent, and grinding and mixing to obtain ferrosilicon alloy slurry; adding the conductive agent slurry and a carbon source into the ferrosilicon alloy slurry, and dispersing and stirring to obtain nano mixed slurry; carrying out spray drying operation on the nano mixed slurry to obtain a spherical particle precursor; adding the carbon-coated material into the spherical particle precursor, and stirring and mixing to obtain a carbon-coated ferrosilicon alloy; and carrying out carbonization operation on the carbon-coated ferrosilicon alloy to obtain the ferrosilicon composite negative electrode material. According to the preparation method of the silicon iron composite negative electrode material, the specific capacity and the first charge-discharge efficiency of the silicon iron composite negative electrode material can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a silicon-iron composite negative electrode material and a preparation method thereof. Background technique [0002] As lithium-ion batteries become more widely used, the requirements for comparing energy and cost are getting higher and higher. At present, graphite anode materials are mainly used in commercialization. After nearly 30 years of development, its energy density is close to the theoretical level (theoretical specific capacity is 372mAh / g), which limits the further improvement of lithium-ion battery energy density. In recent years, high-capacity anode materials have received extensive attention, among which silicon anode materials have good development prospects due to their high specific capacity (theoretical specific capacity reaches 4200mAh / g). [0003] However, due to the large volume expansion of the silicon anode during the charging and discharging process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/386H01M4/38H01M4/583H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/027
Inventor 王培初邓明华任建国田立斌黄浩
Owner HUI ZHOU BTR NEW MATERIAL TECH
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