Silicon-based composite and preparation method thereof and lithium ion battery with silicon-based composite

A technology of silicon-based composite materials and lithium-ion batteries, applied in the field of electrochemistry, can solve problems such as unfavorable industrial production, affecting practical applications, and cumbersome preparation methods

Active Publication Date: 2016-11-23
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, all below 70%, and its preparation method is cumbersome, and it does not utilize industrial production, which seriously affects its practical application.

Method used

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  • Silicon-based composite and preparation method thereof and lithium ion battery with silicon-based composite
  • Silicon-based composite and preparation method thereof and lithium ion battery with silicon-based composite
  • Silicon-based composite and preparation method thereof and lithium ion battery with silicon-based composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A preparation method for a silicon-based composite negative electrode material for a lithium ion battery, comprising the steps of:

[0081] (1) Mix SiO with a median particle size of 50nm and metal magnesium powder of 5μm at a mass ratio of 1:1, put it into a VC machine, set the frequency to 20HZ, and set the time to 1h. Then put the mixed material in a heat treatment furnace, pass in argon, raise the temperature to 650°C, react for 3h, soak the reacted product in 1mol / L HCl solution for 2h, centrifuge, suction filter, and dry at 80°C Dendritic nano-silicon is obtained with an average particle size of 35 nm.

[0082] (2) Put the dendritic nano-silicon in the rotary furnace, feed methane gas, the flow rate is 0.3L / min, control the rotational speed of the rotary furnace to 0.8rpm, then raise the temperature to 800°C, keep it for 3h, and obtain the carbon-coated dendritic nano-silicon silicon.

[0083] (3) Disperse carbon-coated dendritic nano-silicon, mix it with phenol...

Embodiment 2

[0091] A preparation method for a lithium-ion battery nano-silicon-based composite negative electrode material, comprising the steps of:

[0092] (1) Mix SiO with a median particle size of 50nm and metal sodium powder of 10μm at a mass ratio of 1:1, put it into a VC machine, set the frequency to 20HZ, and set the time to 1h. Then put the mixed material in a heat treatment furnace, pass in argon, raise the temperature to 650°C, react for 3h, soak the reacted product in 1mol / L HCl solution for 2h, centrifuge, suction filter, and dry at 80°C Dendritic nano-silicon is obtained with an average particle size of 50 nm.

[0093] (2) Put the dendritic nano-silicon in the rotary furnace, feed methane gas, the flow rate is 0.3L / min, control the rotational speed of the rotary furnace to 0.8rpm, then raise the temperature to 800°C, keep it for 3h, and obtain the carbon-coated dendritic nano-silicon silicon.

[0094] (3) Disperse carbon-coated dendritic nano-silicon, mix it with pitch pow...

Embodiment 3

[0097] A preparation method for a lithium-ion battery nano-silicon-based composite negative electrode material, comprising the steps of:

[0098] (1) SiO with a median particle size of 20nm 2 Mix it with 20μm metal magnesium powder at a mass ratio of 1:1, put it into a VC machine, set the frequency to 20HZ, and set the time to 1h. Then put the mixed material in a heat treatment furnace, pass in argon, raise the temperature to 700°C, react for 3h, soak the reacted product in 0.5mol / L HCl solution for 2h, centrifuge, suction filter, and bake at 80°C Dry to obtain dendritic nano-silicon with an average particle size of 36nm.

[0099] (2) Place dendritic nano-silicon in a rotary furnace, feed acetylene gas at a flow rate of 0.3L / min, control the rotational speed of the rotary furnace at 0.8rpm, then raise the temperature to 800°C, and keep it for 3h to obtain carbon-coated dendritic nano-silicon silicon.

[0100] (3) Disperse the carbon-coated dendritic nano-silicon, mix it wit...

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Abstract

The invention relates to a silicon-based composite and a preparation method thereof and a lithium ion battery with the silicon-based composite. The silicon-based composite comprises a carbon matrix and carbon-coating dendritic nanometer silicon evenly distributed in the carbon matrix; the carbon-coating dendritic nanometer silicon includes dendritic nanometer silicon and a carbon coating layer coating the surface of the dendritic nanometer silicon. The preparation method includes: restoring silicon oxide through metal to prepare the dendritic nanometer silicon, coating a conductive carbon layer in situ in the silicon surface through a homogeneous coating technology, and dispersing the carbon-coating dendritic nanometer silicon in the carbon matrix through a fusion technology. The preparation method is simple in technology and good in processability, the obtained silicon-based composite, serving as a anode material to produce batteries, has the advantages of high specific capacity, long cycle life and high electrical conductivity; first reversible capacity is above 1480mAh / g, first coulomb efficiency is above 87.1%, and 450 times of circulation capacity retention is above 91.1%.

Description

technical field [0001] The invention belongs to the field of electrochemistry and the application field of lithium-ion battery negative electrode materials, and relates to a composite material, a preparation method thereof, and a lithium-ion battery containing the composite material, in particular to a silicon-based composite material, a preparation method thereof, and a silicon-based composite material containing the composite material. Composite materials as negative electrode materials for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long service life and no environmental pollution, and have been widely used in the 3C field. In recent years, it has been widely developed in the field of power vehicles. With the rapid development of the new energy vehicle market, the requirements for the energy density of the battery are getting higher and higher. The traditional graphite negative electrode is close ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 何鹏肖称茂岳敏任建国
Owner BTR NEW MATERIAL GRP CO LTD
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