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Silicon-carbon composite material, preparation method and application as well as lithium ion battery negative electrode material

A technology of silicon-carbon composite materials and lithium-ion batteries, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as battery performance degradation, and achieve the effect of improving cycle life and avoiding detachment

Active Publication Date: 2017-11-24
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first purpose of the present invention is to provide a silicon-carbon composite material to alleviate the technical problem of battery performance degradation caused by the silicon material being separated from the current collector due to the volume change of silicon when silicon is used as the negative electrode material in the prior art

Method used

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  • Silicon-carbon composite material, preparation method and application as well as lithium ion battery negative electrode material
  • Silicon-carbon composite material, preparation method and application as well as lithium ion battery negative electrode material
  • Silicon-carbon composite material, preparation method and application as well as lithium ion battery negative electrode material

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preparation example Construction

[0078] As a preferred embodiment of the present invention, the preparation method of the above-mentioned silicon-carbon composite material includes the following steps:

[0079] The three-dimensional carbon material is placed as a working electrode in an electroplating solution containing a silicon source, and a three-electrode system is used for electrodeposition in an environment of protective gas to obtain a silicon film on the surface of the three-dimensional carbon material.

[0080] As a preferred embodiment of the present invention, the protective gas in the above method for preparing the silicon-carbon composite material is argon or nitrogen. The use of inert gas protection such as protective argon or nitrogen can prevent the oxidation-reduction reaction of the electroplating solution during the electrodeposition process, avoid the reaction of the silicon source with water and oxygen, and reduce the utilization rate of the electroplating solution.

[0081] As a preferr...

Embodiment approach

[0092] As a preferred embodiment of the present invention, the electrodeposition method includes any one of constant current method, constant voltage method, square wave current method, square wave voltage method or cyclic voltammetry or a combination of at least two methods.

[0093] As a preferred embodiment of the present invention, in the electrodeposition process, the current density is -0.1~-10mA / cm 2 , The voltage range is -1.5~-3.5V, and different current and voltage values ​​are selected according to the concentration of the silicon source in the electroplating solution to improve the electrodeposition effect.

[0094] As a preferred embodiment of the present invention, the counter electrode in the three-electrode system includes a platinum sheet electrode or a titanium sheet electrode. Optionally, the reference electrode in the three-electrode system includes a platinum wire electrode, silver silver chloride electrode, calomel electrode, mercury oxide mercury electro...

Embodiment 1

[0099] This embodiment is a method for preparing a silicon-carbon composite material. The three-dimensional carbon material in this embodiment uses three-dimensional carbon nanotube paper, which includes the following steps:

[0100] Step a): Cut out 18×10mm 2 The three-dimensional carbon nanotube paper was ultrasonically cleaned with deionized water and absolute ethanol for 15 minutes, and then vacuum-dried at 60°C for 12 hours in a vacuum drying oven;

[0101] Step b): In order to further improve the conductivity of the three-dimensional carbon nanotube paper, a thin layer of gold is steamed on the surface of the three-dimensional carbon nanotube paper to form a gold layer. The specific operation includes the following steps: vacuum-drying the three-dimensional carbon nanotube paper Place the nanotube paper in a film steaming machine, steam gold at 200°C, the current is 210A, and the duration is 15min; then take out the carbon nanotube paper, replace one side and repeat the ab...

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Abstract

The invention provides a silicon-carbon composite material, a preparation method and application as well as a lithium ion battery negative electrode material, which relate to the technical field of negative materials for lithium ion batteries. The silicon-carbon composite material comprises a three-dimensional carbon material, wherein the surface of the three-dimensional carbon material is coated with a silicon thin film. The silicon-carbon composite material is used as a negative electrode of the lithium ion battery, so that the technical problem in the prior art that the decreasing of the battery performance is caused by the separation of a silicon material and a current collector due to the volume change of silicon when the silicon is used as a negative electrode material can be solved, and the service life of the lithium ion battery utilizing the silicon as the negative electrode material is prolonged.

Description

technical field [0001] The invention relates to the technical field of anode materials for lithium-ion batteries, in particular to a silicon-carbon composite material, a preparation method and application, and anode materials for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high energy density, high working voltage, low self-discharge, long cycle life, and no memory effect, and are widely used in various portable electronic products. Flexible / foldable optoelectronic devices / wearable devices are one of the most promising electronic devices in the next generation. Therefore, the development of flexible lithium-ion batteries with the characteristics of flexibility and bending stability has become one of the frontier hotspots in the field of energy storage. one. [0003] The current commercial lithium-ion battery anode materials mostly use graphite. Usually graphite is mixed with conductive agent and binder and t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 符金洲刘昊廖立兵范朋王振郝会颖邢杰董敬敬吕国诚梅乐夫
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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