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A kind of silicon carbon composite material and preparation method thereof

A technology of silicon-carbon composite materials and nano-silicon powder, applied in the preparation/purification of carbon, nanotechnology for materials and surface science, silicon, etc., can solve the problem of high safety risk factor, unfavorable scale production, and inability to guarantee Issues such as micron product consistency, batch-to-batch stability, etc.

Active Publication Date: 2022-07-12
GUANGDONG MORION NANOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the silicon carbon in the prepared silicon carbon composite material has a triple core structure of hard carbon-graphene-soft carbon, which has the characteristics of uniform coating of graphene, dense external structure and porous internal structure. Issues of volume expansion, low Coulombic efficiency for initial charge and discharge, and poor electronic conductivity
The use of organic solvents can achieve a good coating effect, but it is not conducive to large-scale production due to its toxicity, high safety risk factor, high recovery process and high cost; the solid phase mixing process can solve the problem of industrialization very well, but in The consistency of sub-micron products and the stability between batches cannot be guaranteed in the process

Method used

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  • A kind of silicon carbon composite material and preparation method thereof
  • A kind of silicon carbon composite material and preparation method thereof
  • A kind of silicon carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of a kind of silicon carbon composite material proposed by the present invention, the steps are as follows:

[0023] (1) At room temperature, add 200g of sweet potato starch to 10Kg of water solvent, stir to fully dissolve, and then add 500g of nano-silica powder, and its D50 particle size is 80nm. After the nano-silicon powder is uniformly dispersed, it is spray-dried and carbonized at high temperature to obtain the precursor A. The inlet temperature of the spray drying equipment was 195°C, the outlet temperature was 90°C, and the atomization frequency was 50Hz. The high-temperature carbonization equipment is a tube furnace with argon protection; the carbonization temperature is 600 °C, the carbonization time is 4 h, and the heating rate is 5 °C / min.

[0024] (2) At room temperature, in 4.95Kg pure water solvent, slowly add 50g graphene oxide to prepare a graphene oxide solution with a concentration of 1.0%; add 50g polydopamine and 250g precurs...

Embodiment 2

[0029] (1) At room temperature, add 300g of sweet potato starch to 10Kg of water solvent, stir to fully dissolve, and then add 500g of nano-silica fume. After the nano-silicon powder is uniformly dispersed, it is spray-dried and carbonized at high temperature to obtain the precursor A. The inlet temperature of the spray drying equipment was 200°C, the outlet temperature was 95°C, and the atomization frequency was 50 Hz. The high-temperature carbonization equipment is a tube furnace with argon protection; the carbonization temperature is 700 °C, the carbonization time is 3 h, and the heating rate is 8 °C / min.

[0030] (2) At room temperature, in 4.95Kg pure water solvent, slowly add 75g graphene oxide to prepare a graphene oxide solution with a concentration of 1.5%; add 56.25g polydopamine and 243.75g precursor to the solution respectively Body A, stir well and spray dry. The inlet temperature of the spray drying equipment was 200°C, the outlet temperature was 95°C, and the ...

Embodiment 3

[0035] (1) At room temperature, add 400g of sweet potato starch to 10Kg of water solvent, stir to fully dissolve, and then add 500g of nano-silica fume. After the nano-silicon powder is uniformly dispersed, it is spray-dried and carbonized at high temperature to obtain the precursor A. The temperature of the inlet of the spray drying equipment is 90 degrees, the temperature of the outlet is 60 degrees, and the atomization frequency is 50 Hz. The equipment used for high temperature carbonization is a tube furnace, protected by argon gas; the carbonization temperature is 800 degrees, the carbonization time is 2h, and the heating rate is 10℃ / min.

[0036] (2) At room temperature, in 9.9Kg pure water solvent, slowly add 100g graphene oxide to prepare a graphene oxide solution with a concentration of 1.0%; add 60g polydopamine and 220g precursor A to the solution respectively , Mix well and spray dry. The inlet temperature of the spray drying equipment was 205°C, the outlet tempe...

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Abstract

The purpose of the present invention is to disclose a silicon-carbon composite material and a preparation method. The silicon-carbon composite material is a triple core structure in which the surface of nano-silicon is covered with three layers of carbon shells; the inner core of the silicon-carbon negative electrode material is nano-sized Silicon particles, the surfaces of nano-silicon particles are sequentially coated with a hard carbon layer, a graphene layer and a soft carbon layer; the hard carbon layer is formed by the pyrolysis of sweet potato starch and has a loose porous structure on the surface; the soft carbon layer is made of pitch. It is formed by carbonization after mixing with artificial graphite. The silicon-carbon composite material prepared by this method has the characteristics of low specific surface area and high tap density in terms of physical and chemical indicators, and in terms of electrochemical performance indicators, it has high first charge and discharge Coulombic efficiency, high gram capacity, stable cycle performance and excellent rate performance, etc. Features.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon carbon composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, long cycle life, and environmental protection. In recent years, with the development of technology, the market space has become larger and larger. At the same time, the market has put forward higher requirements for the battery life of power supply products. At present, the anode materials for lithium-ion batteries are mainly graphite, and in actual use, it is very close to the theoretical capacity of graphite of 372mAh / g. In order to improve the energy density of lithium-ion batteries, it is necessary to urgently develop a new type of anode material with high specific capacity. The theoretical capacity of silicon is 4200mAh / g, and the lithium intercalation potential is about 0.4V higher than that of graphit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525C01B33/02C01B32/05C01B32/184B82Y30/00B82Y40/00
CPCH01M4/386H01M4/625H01M10/0525C01B33/02C01B32/05C01B32/184B82Y30/00B82Y40/00C01P2004/03C01P2004/61Y02E60/10
Inventor 蔡金明汤小辉梁惠明陈其赞彭杨城
Owner GUANGDONG MORION NANOTECHNOLOGY CO LTD
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