Carbon/silicon/carbon nano composite structure cathode material and preparation method thereof

A carbon nanocomposite, negative electrode material technology, applied in the field of electrochemical power supply, can solve the problems of large polarization, poor cycle stability, limited practical application, etc., and achieve the effects of stable material, good repeatability, and controllable geometric structure

Inactive Publication Date: 2011-10-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these materials do not contain highly conductive carriers, and silicon is often in direct contact with the electrolyte, the material is highly polarized under high-current charge-discharge conditions, and the cycle stability at high rates is poor, which limits its practical application. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The porous carbon particle that weighs 1g is placed in a quartz boat, packs into the horizontal tube furnace, and the quartz boat is placed in the middle of the tube furnace, then feeds the mixed gas of argon and hydrogen (9 / 1, v / v), the total flow rate is 100sccm, after the program temperature rises to 1000°C, start to feed SiCl 4 , the flow rate is 20 sccm, and a vacuum is drawn at one end of the gas outlet, and after constant temperature for 60 minutes, it is naturally cooled to room temperature. Then feed argon in the tube furnace, the flow rate is 20 sccm, the temperature is programmed to 950 ° C, the gas is converted into a mixed gas of benzene and argon, the ratio is 1 / 20 (v / v), and the total flow rate is 300 sccm, After 20 minutes at constant temperature, the gas was converted into argon, and naturally cooled to room temperature, the resulting product was a nano-carbon / nano-silicon / porous carbon composite material, wherein the weight percentage of silicon in th...

Embodiment 2

[0024] The multi-walled carbon nanotube particle that takes 1g is packed in the vertical tubular furnace, feeds the mixed gas (95 / 5, v / v) of argon and hydrogen, and total flow is 200sccm, makes the multi-walled carbon in the furnace Nanotube particle fluidization. After the temperature was programmed to 900°C, SiH was introduced into the 4 , the flow rate is 40sccm, and one end of the gas outlet is vacuumized, and after constant temperature for 60 minutes, it is naturally cooled to room temperature. Then, argon gas is introduced into the tube furnace with a flow rate of 200 sccm to fluidize the particles in the furnace, and the temperature is programmed to 1000 ° C to convert the gas into acetylene with a flow rate of 100 sccm. After 10 minutes at constant temperature, the gas is converted into argon gas , naturally cooled to room temperature, the resulting product is nano-carbon / nano-silicon / multi-walled carbon nanotube composite material, wherein the weight percentage of si...

Embodiment 3

[0026] The graphene particle that takes 1g is placed in the quartz boat, packs into the horizontal tube furnace, and the quartz boat is placed in the middle of the tube furnace, then feeds the mixed gas of argon and hydrogen (9 / 1, v / v), the total flow rate is 150sccm, after the temperature is programmed to 900°C, HSiCl is started to be introduced 3 , with a flow rate of 50 sccm, and vacuumize at one end of the gas outlet, keep the temperature constant for 2 hours, and cool down to room temperature naturally. Then feed argon in the tube furnace, the flow rate is 20 sccm, the temperature is programmed to 950 ° C, the gas is converted into a mixed gas of benzene and argon, the ratio is 1 / 10 (v / v), and the total flow rate is 300 sccm, After 20 minutes at constant temperature, the gas is converted into argon, and naturally cooled to room temperature, the resulting product is a nano-carbon / nano-silicon / graphene composite material, wherein the weight percentage of silicon in the com...

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Abstract

The invention discloses a carbon/silicon/carbon nano composite structure cathode material and a preparation method thereof, belonging to the technical field of electrochemical power supply technologies. The cathode material consists of a carbon-based conductive substrate, nano silicon and a nano carbon coating layer, wherein the nano silicon is uniformly distributed on the carbon-based conductive substrate; the nano carbon coating layer is arranged on the surface of the nano silicon; the carbon-based conductive substrate is porous carbon, a carbon nanotube or graphene; the nano silicon exists in the state of nanoparticles or nano films; the weight percentage of the nano silicon in the cathode material is 10-90 percent; and the thickness of the nano carbon coating layer is 0.1-10 nanometers. The preparation method comprises the following steps of: depositing nano silicon on the carbon substrate in a reaction space in oxygen-free atmosphere by adopting a chemical vapor deposition process; and coating nano carbon on the surface of the nano silicon by adopting the chemical vapor deposition process. In the obtained carbon/silicon/carbon composite cathode material, the volume change of a silicon electrode material is controlled effectively in the charging and discharging processes, the electrode structure is kept complete, the circulation volume is large, the circulation service life is long, and the electrochemical performance is high.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power sources, and in particular relates to a carbon / silicon / carbon nanocomposite negative electrode material and a preparation method thereof. Background technique [0002] As a green high-energy battery, lithium-ion batteries are ideal power sources for portable electronic devices and electric vehicles. Exploring new materials with high specific energy, good safety, and low cost and easy availability is the core content of the current lithium-ion battery research field. Research on new negative electrode materials It is of great significance to the development of a new generation of lithium-ion batteries. [0003] Silicon has a very high theoretical specific capacity (4200mAh / g), and a lower lithium storage reaction voltage platform (0.1V vs. Li / Li + ), and silicon is widely distributed in nature, and its content in the earth's crust is second only to oxygen, so silicon anode is a new t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395
CPCY02E60/10
Inventor 任建国蒲薇华何向明李建军高剑
Owner TSINGHUA UNIV
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