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Carbon-coated nano silicon/graphene/cracked carbon layer composition material, preparation method, and lithium ion battery including the composition material

A technology of composite materials and coated carbon layers, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of low Coulombic efficiency and affecting practical applications, etc.

Inactive Publication Date: 2016-11-02
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its first Coulombic efficiency is very low, below 70%, which seriously affects its practical application.

Method used

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  • Carbon-coated nano silicon/graphene/cracked carbon layer composition material, preparation method, and lithium ion battery including the composition material
  • Carbon-coated nano silicon/graphene/cracked carbon layer composition material, preparation method, and lithium ion battery including the composition material
  • Carbon-coated nano silicon/graphene/cracked carbon layer composition material, preparation method, and lithium ion battery including the composition material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (1) Put silicon powder with a median particle size of 40nm in a rotary furnace, pass it into methane for carbon coating, raise the temperature to 800 °C at a heating rate of 5 °C / min, keep it for 3 hours, and naturally cool to room temperature to obtain a carbon coating Covered with nano-silicon.

[0080] (2) Carbon-coated nano-silicon and graphene sheets (thickness is 50nm) are uniformly mixed by nano-silicon in carbon-coated nano-silicon: the mass ratio of graphene=80:20, then the mixed powder is added to anhydrous In ethanol, ultrasonically stir for 30 minutes to form a uniformly dispersed mixed slurry; then place the slurry in a high-speed disperser, disperse and stir for 1 hour, and obtain a homogeneous dispersion system of carbon-coated nano-silicon and graphene sheets. Then the homogeneous dispersion is processed by a mist dryer to obtain spherical particles.

[0081] (3) Proportion the spherical particles obtained in step (2) and the asphalt with a particle siz...

Embodiment 2

[0088] (1) Put silicon powder with a median particle size of 5nm in a rotary furnace, pass it into methane for carbon coating, raise the temperature to 800 °C at a heating rate of 5 °C / min, keep it for 3 hours, and naturally cool to room temperature to obtain a carbon coating Covered with nano-silicon.

[0089] (2) Carbon-coated nano-silicon and graphene sheets (thickness is 100nm) are uniformly mixed by nano-silicon in carbon-coated nano-silicon: the mass ratio of graphene=80:20, then the mixed powder is added to anhydrous In ethanol, ultrasonically stir for 30 minutes to form a uniformly dispersed mixed slurry; then place the slurry in a high-speed disperser, disperse and stir for 1 hour, and obtain a homogeneous dispersion system of carbon-coated nano-silicon and graphene sheets. Then the composite slurry is dried and granulated to obtain spherical particles.

[0090] (3) The spherical particles obtained in step (2) and the epoxy resin with a particle size of 3 μm are prop...

Embodiment 3

[0093] (1) Put silicon powder with a median particle size of 50nm in a rotary furnace, pass it into methane for carbon coating, raise the temperature to 800 °C at a heating rate of 5 °C / min, keep it for 3 hours, and naturally cool to room temperature to obtain a carbon coating Covered with nano-silicon.

[0094](2) carbon-coated nano-silicon and graphene sheets with a thickness of about 60nm are uniformly mixed by nano-silicon in carbon-coated nano-silicon: the mass ratio of graphene=80:20, then the mixed powder is added to anhydrous In ethanol, ultrasonically stir for 30 minutes to form a uniformly dispersed mixed slurry; then place the slurry in a high-speed disperser, disperse and stir for 1 hour, and obtain a homogeneous dispersion system of carbon-coated nano-silicon and graphene sheets. Then the composite slurry is dried and granulated to obtain spherical particles.

[0095] (3) The spherical particles obtained in step (2) and the epoxy resin with a particle size of 3 μ...

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Abstract

The invention relates to a carbon-coated nano silicon / graphene / cracked carbon layer composition material, a preparation method thereof, and a lithium ion battery including the composition material. The composite material comprises spherical particles formed by uniformly dispersing carbon-coated nano silicon in graphene sheets, and a cracked carbon layer which coats the surfaces of the spherical particles. The carbon-coated nano silicon comprises nano silicon and carbon coating layer which coats the surface of the nano silicon. The method is simple, has excellent process performance and is environment-friendly. The carbon-coated nano silicon / graphene / cracked carbon layer composition material has stable structure and high compact density, has excellent performance when being used as an anode material of the lithium ion battery, has high anode capacity, excellent rate capability and cyclic performance, is more than 1500 mAh / g in first-time reversible capacity, is more than 90% in first-time coulomb efficiency and is more than 90% in 500-time cyclic capacity retention ratio and has low expansion.

Description

technical field [0001] The invention belongs to the field of electrochemistry and lithium-ion battery negative electrode materials, and relates to a composite material, a preparation method thereof and a lithium-ion battery comprising the composite material, in particular to a carbon-coated nano-silicon-graphene-cracked carbon layer composite material , a preparation method thereof, and a lithium ion battery comprising the composite material as a negative electrode material. Background technique [0002] Compared with lead-acid, nickel-cadmium, nickel-metal hydride and other batteries, lithium-ion batteries have become one of the hotspots in the field of energy research due to their higher energy density, longer service life, smaller size, and no memory effect. one. At present, graphite and modified graphite are widely used as anode materials for commercial lithium-ion batteries, and their theoretical capacity is only 372mAh / g, which greatly restricts the development of hig...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 何鹏任建国胡亮
Owner BTR NEW MATERIAL GRP CO LTD
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