Preparation method for hollow porous carbon composite material

A technology of composite materials and porous carbon, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve problems such as limited applications, unsuitable for fast charging and discharging, limited capacity, etc., and achieve modification methods The effect of simplicity, environmental friendliness and convenient preparation method

Inactive Publication Date: 2016-07-20
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in these new chemical energy storage technologies that people have explored, the electrode materials used are mainly graphite, and its theoretical specific capacity is 372mAhg -1 , which limits the further improvement of its capacity; at the same time, because its lithium (sodium) intercalation method is generally cross-sectional intercalation, it is not suitable for fast charge and discharge, thus limiting its application in high-power fields

Method used

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  • Preparation method for hollow porous carbon composite material
  • Preparation method for hollow porous carbon composite material
  • Preparation method for hollow porous carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 7.5mmol of nickel acetate tetrahydrate and 15mmol of dimethylglyoxime, grind them separately in an agate mortar at room temperature, and then mix and grind them evenly. The mixture was transferred into a burning boat, which was then pushed into a tube furnace under N 2 Atmosphere, at 5°C min -1 The heating rate was increased to 60°C and kept at this temperature for 5h. Then at 3°C ​​min -1 The heating rate was increased to 650°C and kept at this temperature for 4h. After cooling down to room temperature with the furnace, a hollow porous nitrogen-doped carbon composite material uniformly inlaid with high-content Ni nanoparticles is obtained. This sample is denoted as H-NiN-CNetwork.

[0040] figure 1 It is the H-NiN-CNetwork X-ray diffraction pattern synthesized in this embodiment. The results show that the H-NiN-CNetwork material contains metal Ni (JCPDSNo.65-0380), and the size of Ni nanoparticles is about 20nm (calculated using the Scherrer formula, which i...

Embodiment 2

[0046] Ultrasonic dispersion of 0.3g of H-NiN-CNetwork obtained in Example 1 in 20mL, 1molL -1 hydrochloric acid solution, and then transferred to a 40mL reactor, at 80 ° C, kept for 10h. After natural cooling to room temperature, a hollow porous nitrogen-doped carbon composite material uniformly inlaid with low-content Ni nanoparticles was obtained, and the sample was denoted as L-NiN-CNetwork.

[0047] Figure 5 It is the X-ray diffraction pattern of the L-NiN-CNetwork synthesized in this example. The results show that the L-NiN-CNetwork material still contains metal Ni, but the particle size of Ni is smaller than that before acid etching, which is 8nm (calculated by Scherrer's formula, and this result is consistent with Figure 7-d The results measured in the transmission electron microscope images are consistent).

[0048] Image 6 It is the thermal analysis curve measured in the air atmosphere of the L-NiN-CNetwork synthesized in this embodiment. The results show tha...

Embodiment 3

[0054] Weigh 12.5mmol of zinc acetate dihydrate and 25mmol of dimethylglyoxime, grind them uniformly in an agate mortar at room temperature, then mix and grind them uniformly. The mixture was transferred into a burning boat, and then the burning boat was pushed into a tube furnace, under an Ar atmosphere, at 5 °C min -1 The heating rate was raised to 50°C and kept at this temperature for 7h. Then at 5°C min -1 The heating rate was raised to 500°C and kept at this temperature for 7h. After cooling down to room temperature with the furnace, a hollow porous carbon composite material evenly embedded with ZnO nanoparticles is obtained.

[0055] Similar to Examples 1 and 2, acid etching modification and characterization were carried out on the prepared hollow porous carbon composite material uniformly embedded with ZnO nanoparticles, and the conclusions obtained were basically similar to those of Examples 1 and 2.

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Abstract

The invention discloses a preparation method for a hollow porous carbon composite material. The preparation method comprises the following steps that 1, solid phases are self-assembled to synthesize a metal complex; 2, the metal complex is subjected to in-situ thermolysis and carbothermic reduction to synthesize the hollow porous carbon composite material with embedded metal or metal oxide nano-particles. Furthermore, the carbon composite material is modified and reacts with proper acid, the metal or metal oxide nano-particles in the carbon composite material are removed, and then a graded porous carbon composite material is further obtained. According to the preparation method, a simple one-pot solid-phase reaction method is adopted, step-by-step temperature control is carried out, and then the hollow porous carbon composite material with the evenly embedded metal or metal oxide nano-particles is obtained. Various carbon composite materials synthesized through the method have the advantages of being good in charge and discharge capacity stability, high in specific capacity, excellent in rate capability and the like, and can be applied to lithium ion batteries, electrochemical capacitors and new energy fields.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a preparation method of a hollow porous carbon composite material. The prepared composite material is a hollow porous carbon composite material uniformly embedded with metal or metal oxide nanoparticles, or its A carbon composite material with a hierarchical porous structure that partially or completely removes metals or metal oxides after modification. Background technique [0002] With the growth of the social population and the development of the economy, the global energy shortage is becoming more and more serious, and the environment is deteriorating day by day. People put forward urgent requirements for the development of new energy. As one of the effective measures to develop new energy recognized by people, energy storage technology has received unprecedented attention from governments of various countries, which has greatly promoted the development of ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82Y30/00H01M4/36H01M4/38H01M4/48H01M4/583
CPCB82Y30/00H01M4/362H01M4/38H01M4/48H01M4/583Y02E60/10
Inventor 周益明顾静和李期筠曾盼曹青丹吴平
Owner NANJING NORMAL UNIVERSITY
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