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Composite carbon microspheres as well as preparation method and application thereof

A composite carbon and microsphere technology, applied in chemical instruments and methods, carbon preparation/purification, carbon compounds, etc., can solve the problems of unable to maintain the spherical structure of starch granules, not suitable for large-scale production, and existing safety problems, etc., to achieve Improve the first Coulombic efficiency and high-current charge-discharge performance, avoid fusion and foaming, and reduce cost

Pending Publication Date: 2022-08-09
SHANDONG ENERGY GRP +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The polymer materials used are sucrose, soluble starch, cellulose, etc., and the obtained composite carbon microsphere precursor is subjected to high-temperature carbonization. Graphene cannot be tightly combined with the polymer material, and softening and adhesion occur during the carbonization process. The original spherical granules have completely disappeared, forming lumps with a size of about 20 μm, unable to maintain the original spherical structure of starch granules
At the same time, the use of this technical solution seriously damages the equipment, there are safety problems, and it takes a long time and consumes a lot of energy, so it is not suitable for large-scale production

Method used

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  • Composite carbon microspheres as well as preparation method and application thereof
  • Composite carbon microspheres as well as preparation method and application thereof
  • Composite carbon microspheres as well as preparation method and application thereof

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preparation example Construction

[0032] The invention provides a preparation method of composite carbon microspheres, comprising the following steps:

[0033] A) graphene oxide dispersion is mixed with starch to obtain mixed solution;

[0034] B) spray-drying the mixed solution;

[0035] C) process the product after step B) at 200~260 ℃;

[0036] D) Under the condition of protective gas, the product processed in step C) is heated to 800-1500°C at a rate of 0.5-5°C / min, and carbonized at high temperature at 800-1500°C to obtain composite carbon microspheres.

[0037] In the present invention, the graphene oxide dispersion liquid and starch are first mixed to obtain a mixed liquid.

[0038] In some embodiments of the present invention, the number of layers of the graphene oxide is 1-5 layers, and the diameter of the lamellae is 5-20 μm.

[0039] In some embodiments of the present invention, the concentration of the graphene oxide dispersion is 1-10 mg / mL. In certain embodiments, the concentration of the gra...

Embodiment 1

[0068] 1) 500 mL of graphene oxide dispersion (concentration is 2 mg / mL, and the solvent is deionized water) and 100 g of potato starch are added to the mixer, stirred for 1 h, and fully mixed to obtain a mixed solution;

[0069] 2) setting the drying temperature of the spray dryer to be 250°C, atomization frequency 350Hz, and using the peristaltic pump to suck the obtained mixed solution into the spray dryer for drying at a feed rate of 60mL / min;

[0070] 3) The sample obtained in step 2) was treated in a muffle furnace at 230°C for 6h;

[0071] 4) Place the processed sample in step 3) in a high-temperature carbonization furnace, raise the temperature to 1400°C at a heating rate of 3°C / min in a nitrogen atmosphere, carbonize at high temperature for 2 hours, naturally cool to room temperature, and take it out to obtain graphene Graphene-coated starch-based carbon microspheres with a coating amount of 0.5 wt%.

[0072] figure 1 The SEM image of the graphene-coated starch-base...

Embodiment 2

[0079] 1) 500 mL of graphene oxide dispersion (concentration is 2 mg / mL, and the solvent is deionized water) and 20 g of potato starch are added to the mixer, stirred for 1 h, and fully mixed to obtain a mixed solution;

[0080] 2) setting the drying temperature of the spray dryer to be 250°C, atomization frequency 350Hz, and using the peristaltic pump to suck the obtained mixed solution into the spray dryer for drying at a feed rate of 60mL / min;

[0081] 3) The sample obtained in step 2) was treated in a muffle furnace at 230°C for 6h;

[0082] 4) Place the processed sample in step 3) in a high-temperature carbonization furnace, raise the temperature to 1400°C at a heating rate of 3°C / min in a nitrogen atmosphere, carbonize at high temperature for 2 hours, naturally cool to room temperature, and take it out to obtain graphene Graphene-coated starch-based carbon microspheres with a coating amount of 2.5 wt%.

[0083]The obtained graphene-coated starch-based carbon microsphere...

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Abstract

The invention relates to the technical field of sodium ion batteries, in particular to a composite carbon microsphere and a preparation method and application thereof. Graphene oxide is adopted as a coating material, the surface of starch is coated with graphene by using the flexible structure of graphene, and then the starch-based carbon microspheres are prepared through stabilization and carbonization process treatment. Compared with starch carbon microspheres prepared by an existing process, the graphene can tightly coat the surfaces of starch particles, so that the starch particles are separated from one another, the problems of fusion and foaming in high-temperature carbonization are avoided, meanwhile, a low-temperature stabilization process is added, most moisture in the starch is removed, and the starch carbon microspheres are prepared. The problems of safety and high energy consumption in the large-scale carbonization process are solved, and the prepared starch carbon microspheres can keep complete spherical morphology. Compared with a traditional starch carbon microsphere preparation process, the method has the advantage that the time of the stabilization process after graphene coating is greatly shortened. And meanwhile, the prepared composite carbon microspheres are relatively excellent in electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a composite carbon microsphere, a preparation method and application thereof. Background technique [0002] With the increasingly serious environmental problems and the reduction of non-renewable resources, the search for safe, non-polluting and resource-rich new energy has become a research hotspot. At present, lithium-ion batteries have been widely used in consumer electronic products such as mobile phones, notebook computers, digital cameras, and industrial fields such as electric vehicles due to their high output voltage, small size, light weight, long cycle life, and no pollution. With the popularization of electric vehicles and the explosive growth of large-scale energy storage equipment, lithium resources are constantly being consumed, and we are facing serious resource shortages. It is very urgent to find new alternative resources. Sodium and lithium are in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/184C01B32/194H01M4/36H01M4/62
CPCC01B32/05C01B32/184C01B32/194H01M4/364H01M4/625Y02E60/10
Inventor 刘海燕宋怀河刘学伟张志伟刘涛邢涛王长宇张奎同潘玉峰王雯雯苗阳
Owner SHANDONG ENERGY GRP
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