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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 provide a new negative electrode active material with a special structure and special composition (porous silicon oxide composite materials), aiming to improve electrical properties such as first-time efficiency and cycle stability

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
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Effect test

Embodiment 1

[0069] Put silicon particles with a silicon content of 99.5wt% and a particle size of 25mm into a roller ball mill with a filling factor of 25%; blow in air at 115°C and a humidity of 60%, the positive pressure of the ball mill is 750Pa, and the negative pressure of the collection device is 600Pa; at 60 rpm The ball milling reaction under the rotating speed produces silicon fine particles wrapped in silicon oxide, the particle size is 25 μm, and the oxygen content is 45 wt%. Granules, metal magnesium powder, mixed salt particles (the molar ratio of lithium chloride: sodium chloride is 7:3, eutectic point 570°C) and medium-temperature asphalt according to the ratio of 1:0.2:10:1 are processed by extrusion granulation Mix and granulate to obtain a composite precursor; put the composite precursor into a sintering boat and place it in a muffle furnace, and carry out a sintering reaction under an argon atmosphere, and raise the temperature to 700°C at a rate of 5°C / min, and react fo...

Embodiment 2

[0072] Put silicon particles with a silicon content of 99.5wt% and a particle size of 45mm into a roller ball mill with a filling factor of 30%; blow in air at 120°C and a humidity of 68%, the positive pressure of the ball mill is 760Pa, and the negative pressure of the collection device is 580Pa; at 50 rpm The ball milling reaction under the rotating speed produces silicon fine particles wrapped in silicon oxide, with a particle size of 32 μm and an oxygen content of 65 wt%. Granules, metal magnesium powder, mixed salt particles (the molar ratio of lithium chloride: sodium chloride is 7:3, eutectic point 570°C) and medium-temperature asphalt in the ratio of 1:0.3:10:1 are processed by extrusion granulation Mix and granulate to obtain a composite precursor; put the composite precursor into a sintering boat and place it in a muffle furnace, and carry out a sintering reaction under an argon atmosphere, and raise the temperature to 700°C at a rate of 5°C / min, and react for 6 hours...

Embodiment 3

[0075] Put silicon particles with a silicon content of 99.5wt% and a particle size of 10mm into a roller ball mill with a filling factor of 18%; blow in air at 110°C and a humidity of 55%, the positive pressure of the ball mill is 730Pa, and the negative pressure of the collection device is 620Pa; The ball milling reaction under the rotating speed produces silicon fine particles wrapped in silicon oxide, the particle size is 22 μm, and the oxygen content is 39 wt%. Granules, metal magnesium powder, mixed salt particles (the molar ratio of lithium chloride: sodium chloride is 7:3, eutectic point 570°C) and medium-temperature asphalt in the ratio of 1:0.15:10:1 are processed by extrusion granulation Mix and granulate to obtain a composite precursor; put the composite precursor into a sintering boat and place it in a muffle furnace, and conduct a sintering reaction under an argon atmosphere. Raise the temperature to 700°C at a rate of 5°C / min, and react for 6 hours. After cooling...

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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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