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Hollow carbon sphere as well as preparation method and application thereof

A technology of hollow carbon spheres and carbon sources, applied in chemical instruments and methods, carbon compounds, nanotechnology for materials and surface science, etc., can solve problems such as poor particle size uniformity, and achieve high degree of graphitization and excellent morphology uniform effect

Active Publication Date: 2021-07-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prepared nitrogen-doped hollow carbon spheres have good cycle stability and rate performance, but the disclosed carbon spheres are modified from the perspective of doping, and the method used does not form carbon spheres with smaller particle sizes. poor uniformity

Method used

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  • Hollow carbon sphere as well as preparation method and application thereof
  • Hollow carbon sphere as well as preparation method and application thereof
  • Hollow carbon sphere as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a hollow carbon sphere, and the raw materials for the preparation of the hollow carbon sphere include ferrocene and polytetrafluoroethylene.

[0045] The preparation method of above-mentioned hollow carbon sphere comprises the steps:

[0046] (1) Polytetrafluoroethylene (purchased from Aladdin, the trade mark is P110094) and ferrocene are uniformly mixed in a ratio of 20:1 according to the molar ratio of carbon atoms to iron atoms to obtain a mixed powder;

[0047] (2) The resulting mixed powder is transferred to a closed reaction kettle, and the reaction kettle is filled with argon;

[0048] (3) heat-treat the closed reaction vessel under an argon atmosphere, raise the temperature to 700°C for 4 hours at a rate of 10°C / min, and obtain hollow carbon spheres and residual mixture after cooling;

[0049](4) Disperse the above mixture in ethanol, centrifuge at low speed to separate the hollow carbon spheres from the residual mixture, take the super...

Embodiment 2

[0051] This embodiment provides a hollow carbon sphere, and the preparation raw materials of the hollow carbon sphere include ferrocene, polytetrafluoroethylene and sucrose.

[0052] The preparation method of above-mentioned hollow carbon sphere comprises the steps:

[0053] (1) The mixture of polytetrafluoroethylene (purchased from Aladdin, brand name P110094) and ferrocene and sucrose (molar ratio of carbon atom is 5:1) is 10:1 according to the molar ratio of carbon atom and iron atom The ratio is mixed evenly to obtain a mixed powder;

[0054] (2) The resulting mixed powder is transferred to a closed reactor, and the reactor is filled with nitrogen;

[0055] (3) heat-treat the closed reaction in a helium atmosphere, heat up to 900°C at a rate of 30°C / min for 0.5h, and obtain hollow carbon spheres and the residual mixture after cooling;

[0056] (4) Disperse the above mixture in ethanol, centrifuge at low speed to separate the hollow carbon spheres from the residual mixtur...

Embodiment 3

[0058] This embodiment provides a hollow carbon sphere, and the preparation raw materials of the hollow carbon sphere include ferrocene, polytetrafluoroethylene and glucose.

[0059] The preparation method of above-mentioned hollow carbon sphere comprises the steps:

[0060] (1) The mixture of polytetrafluoroethylene (purchased from Aladdin, brand name P110094) and glucose (the molar ratio of carbon atoms is 100:1) and ferrocene is 2:1 according to the molar ratio of carbon atoms and iron atoms. The ratio is mixed evenly to obtain a mixed powder;

[0061] (2) The resulting mixed powder is transferred to a closed reactor, and the reactor is filled with nitrogen;

[0062] (3) heat-treat the closed reaction in a helium atmosphere, heat up to 400°C at a rate of 1°C / min for 12 hours, and obtain hollow carbon spheres and residual mixture after cooling;

[0063] (4) Disperse the above mixture in ethanol, centrifuge at low speed to separate the hollow carbon spheres from the residua...

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Abstract

The invention relates to hollow carbon spheres as well as a preparation method and application thereof. The hollow carbon spheres are prepared from raw materials including a carbon source and a catalyst, the carbon source comprises polytetrafluoroethylene or a combination of polytetrafluoroethylene and other carbon sources. The hollow carbon spheres are high in dispersion degree, relatively small and uniform in particle size and high in graphitization degree, and have relatively high reversible specific capacity and excellent cycling stability when being used as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of carbon materials, in particular to a hollow carbon sphere and its preparation method and application. Background technique [0002] Carbon materials have been widely used in lithium-ion battery electrode materials due to their low price, low operating voltage, high conductivity, good cycle life, and small volume changes during lithium intercalation / extraction. , Carbon materials can also be used in energy fields such as sodium-ion batteries, potassium-ion batteries, and supercapacitors. [0003] CN110729480A discloses a nitrogen-doped porous hollow carbon sphere and its preparation method. The disclosed preparation method obtains melamine resin pellets through one-step condensation of melamine and formaldehyde. The pellets are used as a template, and pyrrole is used as a nitrogen source and a carbon source. , ammonium persulfate is used as a catalyst to achieve polypyrrole coating on melamine resin beads...

Claims

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Application Information

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IPC IPC(8): C01B32/205B82Y30/00B82Y40/00
CPCC01B32/205B82Y30/00B82Y40/00
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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