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Gas atomization method and device for preparing mesocarbon microbeads

A technology of mesophase carbon microspheres and gas atomization, applied in chemical instruments and methods, inorganic chemistry, electrical components, etc., can solve the problems of low production efficiency, high cost, and unfriendly preparation process of MCMB, and achieve easy industrialization Production, good sphericity, environment-friendly effect

Active Publication Date: 2014-03-26
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a gas atomization method and device for preparing mesophase carbon microspheres, which solves the problems of low production efficiency, high cost and unfriendly preparation process of the negative electrode material MCMB used in lithium ion batteries.

Method used

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  • Gas atomization method and device for preparing mesocarbon microbeads
  • Gas atomization method and device for preparing mesocarbon microbeads
  • Gas atomization method and device for preparing mesocarbon microbeads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Put the naphthalene-based mesophase pitch in a heating electric furnace, heat it to 360°C, and keep it warm for 0.5h to obtain molten mesophase pitch; transport the mesophase pitch to the jet nozzle, and the output of the nozzle is 1.0kg / min; the pressure N with a temperature of 9.0Mpa and a temperature of 60°C 2 Or non-oxidizing gas such as Ar enters the gas atomization head; the gas nozzle of the gas atomization head sprays the mesophase pitch, and the mesophase pitch droplets are cooled into balls in the atomization chamber. At this time, the temperature of the atomization chamber is 50°C and the pressure At 0.6 atm, the small spheres fell into the powder collector; the collected mesophase pitch spheres were placed in a vertical oxidation furnace, and the temperature was raised freely from room temperature to 220°C, and then the temperature was raised to 280°C at 0.1°C / min, and Keep warm for 4 hours to complete the non-melting treatment of the mesophase pitch spheres...

Embodiment 2

[0048] Put the naphthalene-based mesophase pitch in a heating electric furnace, heat it to 400°C, and keep it warm for 4 hours to obtain molten mesophase pitch; transport the mesophase pitch to the jet nozzle, and the output of the nozzle is 2.5kg / min; the pressure is Mixed oxidizing gas containing 15% oxygen and nitrogen or argon at 3.0Mpa and temperature of 60°C enters the gas atomizing head; the gas nozzle of the gas atomizing head sprays the mesophase pitch, and the mesophase pitch droplets are cooled in the atomizing chamber At this time, the temperature of the atomization chamber is 15°C, the pressure is 1.6atm, and the small balls fall into the powder collector; the collected mesophase pitch small balls are placed in a vertical oxidation furnace, and the temperature is freely raised from room temperature to 260°C, then raise the temperature to 350°C at 0.5°C / min, and keep it warm for 0.5h to complete the non-melting treatment of the mesophase pitch spheres; place the non...

Embodiment 3

[0050] Put the purified coal tar mesophase pitch in a heating electric furnace, heat it to 280°C, and keep it warm for 12 hours to obtain molten mesophase pitch; transport the mesophase pitch to the jet nozzle, and the output of the nozzle is 1.5kg / min; the pressure N with a temperature of 6.0Mpa and a temperature of 25°C 2 Or non-oxidizing gas such as Ar enters the gas atomization head; the gas nozzle of the gas atomization head sprays the mesophase pitch, and the mesophase pitch droplets are cooled into balls in the atomization chamber. At this time, the temperature of the atomization chamber is 60°C and the pressure 0.9atm, the small spheres fell into the powder collector; the collected mesophase spheres were placed in a vertical oxidation furnace, and the temperature was raised freely from room temperature to 160°C, and then the temperature was raised to 220°C at 0.1°C / min, and kept warm 5h, complete the non-melting treatment of the mesophase pitch spheres; place the spher...

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Abstract

The invention discloses a gas atomization method and device for preparing mesocarbon microbeads. A technological process comprises preparation of mesophase pitch, extruding and drawing, gas atomization, cooling, powder collection and screening, oxidization and carbonization, graphitization and the like. The device comprises an electric mesophase pitch smelting furnace, a screw extruding and conveying machine, an atomization chamber and a gas atomization head, wherein one end of the screw extruding and conveying machine is connected with the electric mesophase pitch smelting furnace, and the other end extends into the atomization chamber and is connected with the gas atomization head; the gas atomization head is fixed at the top of the atomization chamber through an atomization head fixing device; a gas channel of the gas atomization head is connected with an atmospheric pressure control system; a powder collector is arranged at the bottom of the atomization chamber; and a temperature control pipeline is arranged on the inner wall of the atomization chamber and connected with a temperature control system.

Description

technical field [0001] The invention belongs to the field of graphite negative electrode materials for lithium ion batteries, and relates to a manufacturing technology of mesophase carbon microspheres for power lithium batteries, in particular to a gas atomization method and device for preparing mesophase carbon microspheres. Background technique [0002] Mesocarbon microbead (MCMB) has a unique spherical layered structure, excellent chemical stability and thermal stability, excellent thermal conductivity and electrical conductivity, and outstanding intercalation characteristics; in 1992, Yamamura, Japan first applied MCMB to lithium ion In batteries, with the advancement of technology and the use of clean energy, the demand for power lithium-ion batteries will gradually increase; the high-quality specific capacity, low irreversible mass-specific capacity and low capacity decay rate of MCMB make it a very competitive Potential excellent anode material. [0003] In terms of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/583C01B32/205
CPCY02E60/10
Inventor 王小宪郑化安付东升杨阳张云党颂王文婧
Owner SHAANXI COAL & CHEM TECH INST
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