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Pyrolysis hard carbon material and preparation method and use thereof

A technology for pyrolyzing hard carbon and hard carbon, which is applied in the direction of electrolytic capacitors, electrical components, battery electrodes, etc., to achieve the effects of easy control, simple process and wide application

Active Publication Date: 2015-09-16
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this kind of spherical hard carbon material has the advantages of uniform particle size distribution and high packing density, there is limited space for further increasing the specific surface area to increase the loading of nanomaterials.

Method used

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  • Pyrolysis hard carbon material and preparation method and use thereof
  • Pyrolysis hard carbon material and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] After washing, drying, and ball milling, 10 g of glucose was placed in a pyrolysis reactor, and Ar-8%H 2 (H 2 accounted for Ar-H 2 The volume percentage of the mixed gas is 8%), and the temperature in the reactor is raised to 750°C at a rate of 2°C / min, and after maintaining a constant temperature for 15 hours, it is naturally cooled to room temperature to obtain an average thickness of about 3nm and a geometric surface area of ​​about 623m 2 / g, the smallest pore diameter is about 0.7nm, and the ratio of the smallest radial dimension to the average thickness is about 5200:1.

[0056] The SEM photos of the flake-like material at magnifications of 5K and 10K are shown in Figure 1(a) and Figure 1(b), from which it can be clearly seen that the pyrolytic hardening The morphology of the carbon material is mainly flake.

[0057] X-ray diffraction pattern as Figure 8 shown, d 002 =3.72; Raman spectrum such as Figure 9 Shown, L a =23nm.

[0058] Electron diffraction s...

Embodiment 2

[0061] Except for Ar-1%H 2 (H 2 accounted for Ar-H 2 The volume percentage of the mixed gas is 1%) to replace Ar-8%H 2 Except, all the other obtain flake-shaped pyrolytic hard carbon materials according to the same method as in Example 1, with an average thickness of about 5nm and a geometric surface area of ​​about 405m 2 / g, the smallest pore diameter is about 0.7nm, and the obtained flake material has a ratio of the smallest radial dimension to the average thickness of about 3200:1.

[0062] The SEM photo of the flake-like material at a magnification of 2K is as follows figure 2 As shown, it can be clearly seen from the SEM image that the pyrolysis hard carbon material produced by the above preparation method is in the form of a large number of flakes, and the hard carbon material that is mainly thin flakes can be obtained after proper separation.

[0063] According to the X-ray diffraction pattern, d 002 =3.72; Raman spectrum, L a =20nm.

Embodiment 3

[0065] Except for Ar-0.5%H 2 (H 2 accounted for Ar-H 2 The volume percentage of the mixed gas is 0.5%) to replace Ar-8%H 2 Except, all the other obtain the pyrolytic hard carbon material according to the same method as in Example 1, and get the flake product therein to detect, and its average thickness is about 8nm, and the geometrical surface area is about 280m 2 / g, the smallest pore diameter is about 0.7nm, and the ratio of the smallest radial dimension to the average thickness is about 1000:1.

[0066] The SEM photo of the flake-like material at a magnification of 1K is as follows image 3 As shown, it can be clearly seen from the SEM image that the pyrolytic hard carbon material produced by the above preparation method presents a certain amount of thin flakes, which are difficult to separate and collect.

[0067] According to the X-ray diffraction pattern, d 002 =3.72; Raman spectrum, L a =20nm.

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Abstract

The invention provides a pyrolytic hard charcoal material and a preparation method and a use thereof. The pyrolytic hard charcoal material is a two dimensional plane-similar sheeting material which is formed by pyrolysing a precursor of the hard charcoal, wherein the average thickness is 1-200nm and the geometric surface area is 10-2000 square meter / g. Micropores or mesopores exist in the pyrolytic hard charcoal material. The invention further provides a method of the pyrolytic hard charcoal material. The sheet pyrolytic hard charcoal material similar to graphene in shape is extremely wide in application and can be applied to preparing a cathode material of a lithium ion battery or a sodium ion battery, an electrode material of an electrochemical capacitor, a carrier for a fuel cell and a metal air battery electrode catalyst, a composite material with great toughness effect, a toxic material absorbent, an absorbent for special use, and a decolorising agent and a gas sensitive element in food production.

Description

technical field [0001] The invention relates to a carbon material and a preparation method thereof, in particular to a pyrolytic hard carbon material and a preparation method and application thereof. Background technique [0002] Hard carbon refers to non-graphitizable carbon, which is pyrolytic carbon of high molecular polymer. For a long time, hard carbon materials have been widely concerned as anode materials for lithium-ion batteries due to their high specific capacity, long cycle life, good power performance, and low cost. It can also be used as anode materials for sodium-ion batteries, electrochemical Electrode materials for capacitors, carriers for chemical and electrochemical reaction catalysts, used in gas sensors, etc. [0003] The application of hard carbon materials and the influence of the structure and morphology of hard carbon materials on the application effect are always important contents of the material research. Many studies have found that the internal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01G9/042H01M4/133
CPCY02E60/122Y02E60/10
Inventor 董金平黄学杰闫勇
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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