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Novel carbon spheres and preparation method and application thereof

A technology of carbon spheres and inner spheres, applied in the field of nanomaterials, can solve the problems of low active material content, low electrode specific capacity and energy density, etc., and achieve the effect of increasing capacity and broad application prospects

Active Publication Date: 2017-05-10
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the single-walled hollow carbon material has a low active material content due to the large hollow structure inside, so that the specific capacity and energy density of the entire electrode are still low.

Method used

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  • Novel carbon spheres and preparation method and application thereof
  • Novel carbon spheres and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Follow the steps below to prepare carbon spheres:

[0031] 1. Mix 1mol phenol, 1.5mol formaldehyde, 2mmol sodium carbonate and 500mL deionized water evenly, the concentration of phenol is 2mol / L, the concentration of formaldehyde is 3mol / L, and the concentration of catalyst sodium carbonate is 4mmol / L; at a speed of 15r / min Stir at low temperature for 20 minutes to obtain a precursor solution, then place the obtained solution in an oil bath, stir at a rate of 20 r / min, and simultaneously raise the temperature to 150° C. and keep for 5 hours to obtain a suspension of phenolic resin microspheres. The obtained microsphere solution was suction-filtered, rinsed with deionized water, and placed in an oven at 60° C. for 12 hours to obtain dry phenolic resin microspheres.

[0032] 2. Add the above-mentioned microspheres into 2mol / L hydrochloric acid for 12 hours, take out the sample, and centrifuge 7-8 times with deionized water to make the supernatant of the centrifugation liq...

Embodiment 2

[0036] Follow the steps below to prepare carbon spheres:

[0037] 1. Add 0.03mol resorcinol to a flask protected by nitrogen gas, then add 50mL ethanol and 200mL deionized water to the flask, stir the reactants evenly, then add 2mL ammonia water and 0.03mol formaldehyde to it, The resorcinol concentration is 0.12mol / L, the formaldehyde concentration is 0.12mol / L; the stirring rate is 5000r / min, and the reaction is at room temperature for 12h. Suction filtration, rinse with deionized water, and freeze-dry to obtain resorcinol-formaldehyde resin microspheres.

[0038] 2. Add the above-mentioned microspheres into 1mol / L hydrochloric acid for 15 hours, take out the sample, centrifuge 7~8 times with deionized water to make the supernatant of the centrifugation solution pH=7, then put it in a drying oven, at 60℃ Drying for 6 hours under the hood to obtain cured phenolic resin microspheres.

[0039] 3. Add the obtained cured phenolic resin microspheres into a porcelain boat and pla...

Embodiment 3

[0042] Follow the steps below to prepare carbon spheres:

[0043] 1. Take 0.1mol formaldehyde, 0.16mol urea, 0.4mol formic acid, and 200mL deionized water, and stir to mix the above substances evenly. The concentration of urea is 0.8mol / L, the concentration of formaldehyde is 0.5mol / L, and the concentration of catalyst formic acid is 2mol / L. , standing at room temperature for 48h, a white precipitate was obtained. Centrifuge and wash with water for 5 times, put into an oven at 80°C and dry to obtain a white powder, that is, urea-formaldehyde resin microspheres.

[0044] 2. Take 5g of concentrated hydrochloric acid with a mass fraction of 37% and dissolve it in 25g of deionized water to make a curing agent. Pour the obtained urea-formaldehyde resin powder into the above-mentioned hydrochloric acid solution and let it stand for 12 hours. Centrifuge and wash 8 times with water until the supernatant has a pH of 7, put it in an oven at 80°C and dry it to obtain cured urea-formald...

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Abstract

The invention belongs to the technical field of a nanomaterial, and discloses novel carbon spheres. Each carbon sphere comprises an external sphere and an internal sphere, wherein the internal sphere is a solid carbon sphere; the external sphere adopts a porous carbon shell with a mesoporous structure; and a hollow cavity is formed between the external sphere and the internal sphere. The invention also discloses a preparation method for the carbon spheres; the preparation method comprises the steps of S1, taking formaldehyde and a poly-condensation monomer as raw materials, mixing the raw materials in deionized water and preparing formaldehyde poly-condensation resin microspheres under the effect of a catalyst; S2, adding the obtained formaldehyde resin microspheres into hydrochloric acid to be cured; S3, performing pre-oxidization treatment on the cured formaldehyde resin microspheres through heating; and S4, performing carbonization on the pre-oxidized formaldehyde resin microspheres to obtain the carbon spheres. The carbon spheres are creative in structure; the internal carbon spheres and the hollow cavities can be used for storing active material particles, so that battery capacity can be greatly increased; and the carbon spheres can be applied to the fields of catalysis, adsorption, pharmaceuticals and the like and has high application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a novel carbon sphere and its preparation method and application. Background technique [0002] Due to its special structure, carbon spheres are more and more widely used in catalysis, pharmaceuticals, batteries and other fields. In order to adapt to different conditions of use, various carbon nanospheres with different shapes were designed and synthesized. In the process of preparing high-performance lithium / sodium electrodes, solid or hollow carbon spheres with a porous structure are usually used as a support for lithium / sodium atoms to improve the capacity, cycle performance, and rate characteristics of the electrode. Ordinary carbon spheres can use the pores on the surface and the amorphous graphite layer on the surface to store active material particles. Studies have found that carbon spheres have good lithium storage capacity and good rate performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01G11/36
CPCH01G11/36H01M4/625Y02E60/10
Inventor 卢周广熊伟张剑桥
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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