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Continuous microsphere gas phase carbon coating production process

A production process and carbon coating technology, applied in the field of continuous microsphere gas-phase carbon coating production process, can solve the problems of high labor intensity, difficulty in expanding production scale, and failure to consider comprehensive utilization of energy, etc., to achieve good coating quality, The effect of covering quality and stability

Pending Publication Date: 2022-04-15
中昊黑元化工研究设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] According to the current gas-phase coating process, they are all batch-type, labor-intensive, energy-consuming, and difficult to expand the production scale.
In the patent publication number CN109873135A, the patent name is: melodic chemical vapor deposition carbon coating method, the patent does not consider the comprehensive utilization of energy, and the annual output is only 3 to 5 tons

Method used

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  • Continuous microsphere gas phase carbon coating production process
  • Continuous microsphere gas phase carbon coating production process
  • Continuous microsphere gas phase carbon coating production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Carbon-coated microspheres are required to be lithium battery anode materials (Si, SiO / C) without disproportionation reactions. The diameter of microspheres is 0.8-1.2 microns, and the processing capacity is 10kg / h.

[0045] Step 1. System preheating and oxygen replacement

[0046] After decompression (from pressure tank) or pressurization (from gas cabinet) 25 ~ 35Nm 3 / h nitrogen passes through heat exchanger 2, heater 3, Venturi mixer 4, coating generator 5, coating tower 6, bag filter 8, fan 12 and other equipment and pipelines to preheat the system and replace the system Internal oxygen, the power of the heater 3 is adjusted at 10kw to 20kw. After 30 to 60 minutes, the oxygen content in the system is less than 3%, the outlet temperature of the heater 3 reaches about 950°C, and the inlet temperature of the bag filter 8 is less than 150°C.

[0047] Step 2. Perform microsphere carbon coating operation

[0048] After the above process parameters are stabilized, the ...

Embodiment 2

[0056]Carbon-coated microspheres are required to be lithium battery anode materials [SiO, SiO2] for disproportionation reaction. The diameter of microspheres is 0.8-1.2 microns, and the processing capacity is 10kg / h.

[0057] Step 1. System preheating and oxygen replacement

[0058] Depressurized (from nitrogen tank) or pressurized (from nitrogen tank) 25 to 35Nm 3 / h Nitrogen passes through heat exchanger 2, heater 3, coating tower 6, bag filter 8, fan 12 and other equipment and pipelines to preheat the system and replace oxygen in the system. The power of heater 3 is adjusted from 10kW to 20kW After 30 to 60 minutes, the oxygen content in the system is less than 3%, the outlet temperature of the electric heater reaches about 950°C, and the inlet temperature of the bag filter is less than 150°C.

[0059] Step 2. Perform microsphere carbon coating operation

[0060] After the above process parameters are stabilized, the acetylene gas valve is slowly opened to allow the acet...

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Abstract

The invention relates to the technical field of lithium / sodium battery negative electrode material production, in particular to a continuous microsphere gas phase carbon coating production process which comprises the following steps: S1, heating stable gas to 900-960 DEG C; s2, feeding the stable gas into a Venturi mixer, and adding the microspheres, so that the stable gas heats the microspheres; s3, the microspheres are subjected to gas-phase carbon coating through carbon source gas through a coating generator and a coating tower, and the thickness of a coating layer is larger than 4 nm; and S4, after the gas-solid mixture from the coating tower passes through a heat exchanger and a water cooler, the temperature is reduced to 150-200 DEG C, the gas-solid mixture enters a bag filter to be subjected to gas-solid separation, gas is conveyed to a gas-gas separation system through a fan, and the solid enters a product tank through an airtight valve to be further cooled and then is packaged in a packaging system. The method has the advantages that the energy consumption is low, and large-scale continuous production can be realized.

Description

technical field [0001] The invention relates to the technical field of production of lithium / sodium battery negative electrode materials, in particular to a continuous microsphere gas-phase carbon coating production process. Background technique [0002] With the development of the electric vehicle industry, there is an urgent need to develop new high-performance lithium / sodium-ion batteries, and battery performance is closely related to electrode materials. At present, graphite anode materials for industrial production can no longer meet the requirements of long life and high capacity of power batteries. And Si, SiOx, SiOx / C will become a new generation of lithium / sodium ion battery anode materials with good prospects. [0003] In order to improve Coulombic efficiency and electrical conductivity, Si, SiOx, and SiOx / C microspheres are required for carbon coating. There are three carbon coating processes: solid phase coating, liquid phase coating and gas phase coating, among...

Claims

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Application Information

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IPC IPC(8): C01G39/02C01B33/02C01B33/12C01B32/05H01M4/62C01G23/047
CPCC01G39/02C01B33/02C01B33/12C01B32/05H01M4/625C01G23/08C01P2004/32C01P2004/62C01P2004/61Y02E60/10
Inventor 赵宽明王家贵何平昌广金
Owner 中昊黑元化工研究设计院有限公司