Porous silicon monoxide composite material and preparation and application thereof

A technology of silicon oxide and composite materials, applied in the preparation/purification of silicon oxide, silicon dioxide, carbon, etc., can solve the problems of complex preparation process and low first-time efficiency.

Active Publication Date: 2020-02-28
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art and improving the low efficiency and complex preparation process of the silicon oxide negative electrode material for the first time, the first purpose of the present invention is to

Method used

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  • Porous silicon monoxide composite material and preparation and application thereof
  • Porous silicon monoxide composite material and preparation and application thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0068] Example 1

[0069] Put silicon particles with a silicon content of 99.5% by weight and a particle size of 25mm into a drum ball mill with a filling factor of 25%; air at 115°C and 60% humidity is blown into the ball mill with a positive pressure of 750Pa and a negative pressure of the collection device of 600Pa; The ball milling reaction at the rotating speed produces silicon oxide-coated silicon fine particles with a particle size of 25μm and an oxygen content of 45wt%; the fine particles are carried out of the roller ball mill through a negative pressure airflow and enter the silicon powder collection device; the collected silicon oxide-coated silicon Fine particles, metallic magnesium powder, mixed salt particles (the molar ratio of lithium chloride: sodium chloride is 7:3, and the eutectic point is 570°C) and the medium temperature asphalt are made by extrusion granulation at the ratio of 1:0.2:10:1 Mix and granulate to obtain a composite precursor; put the composite p...

Example Embodiment

[0071] Example 2

[0072] Put silicon particles with a silicon content of 99.5wt% and a particle size of 45mm into a drum ball mill with a filling factor of 30%; blow into the air at 120°C and 68% humidity, the positive pressure of the ball mill is 760Pa, and the negative pressure of the collection device is 580Pa; The ball milling reaction at the rotating speed produces silicon oxide-coated silicon fine particles with a particle size of 32μm and an oxygen content of 65wt%; the fine particles are carried out of the roller ball mill through a negative pressure airflow and enter the silicon powder collection device; the collected silicon oxide-coated silicon Particles, metallic magnesium powder, mixed salt particles (the molar ratio of lithium chloride: sodium chloride is 7:3, and the eutectic point is 570°C) and the medium temperature asphalt are in the ratio of 1:0.3:10:1 by extrusion granulation. Mix and granulate to obtain a composite precursor; put the composite precursor into...

Example Embodiment

[0074] Example 3

[0075] Put silicon particles with a silicon content of 99.5% by weight and a particle size of 10mm into a drum ball mill with a filling factor of 18%; blow into air at 110°C and 55% humidity, the ball mill has a positive pressure of 730Pa, and the collection device has a negative pressure of 620Pa; at 70 rpm The ball milling reaction at rotating speed produces silicon oxide-coated silicon fine particles with a particle size of 22μm and an oxygen content of 39wt%; the fine particles are carried out of the roller ball mill through a negative pressure airflow and enter the silicon powder collection device; the collected silicon oxide is wrapped in silicon Microparticles, metallic magnesium powder, mixed salt particles (the molar ratio of lithium chloride: sodium chloride is 7:3, and the eutectic point is 570℃) and the medium temperature asphalt are in the ratio of 1:0.15:10:1 by extrusion granulation. Mix and granulate to obtain a composite precursor; put the comp...

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Abstract

The invention belongs to the field of lithium ion battery materials, and particularly discloses a porous silicon monoxide composite material. The composite material comprises an inner core, a middle layer compounded on the surface of the inner core and an outer layer compounded on the surface of the middle layer, wherein the inner core is silicon, the middle layer is silicon monoxide and silicateof metal M dispersed in the silicon monoxide, the outer layer is a carbon coating layer, and the metal M is a metal element capable of reducing silicon oxide. The invention also provides a preparationmethod of the composite material and an application of the composite material as a negative electrode active material of a lithium ion secondary battery. Research finds that the composite material has the characteristics of long cycle life, high initial efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrode materials, and in particular relates to a porous silicon oxide composite powder material and a preparation method thereof. Background technique [0002] With the continuous update of consumer electronics products and the rapid development of electric vehicles, the demand for a new generation of high-energy lithium-ion batteries is increasing, prompting its anode materials to shift from intercalated carbon-based materials (theoretical capacity 372mAh / g) to those with Lithiated metal materials, metal compounds and composite materials with high theoretical capacity are developed. Among them, silicon has become the mainstream of research on new anode materials at home and abroad due to its advantages such as high theoretical capacity (4211mAh / g), good safety performance and wide sources. However, the huge volume expansion and low intrinsic conductivity of silicon during the charge-d...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525C01B32/05C01B33/12C01B33/22C01B33/26C01B33/32
CPCH01M4/366H01M4/386H01M4/483H01M4/625H01M4/628H01M10/0525C01B33/12C01B33/32C01B33/22C01B33/26C01B32/05H01M2004/021H01M2004/027C01P2004/80C01P2002/72C01P2004/03C01P2004/61C01P2002/88C01P2006/40Y02E60/10
Inventor 杨娟唐晶晶周向阳刘晓剑周昊宸王鹏侯林
Owner CENT SOUTH UNIV
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