Soft and hard composite carbon as well as preparation method and application thereof

A soft-hard composite, soft carbon technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of hard carbon and soft carbon difficult to achieve uniform mixing, amorphous carbon core difficult to function, difficult to accurately adjust the migration channel and other problems , to achieve the effect of reliable bonding, alleviating the effect of volume expansion and increasing the contact area

Pending Publication Date: 2022-04-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are also many disadvantages through simple mechanical mixing; for example: 1) the combination of hard carbon and soft carbon, which has a similar core-shell structure, makes it difficult for amorphous carbon cores to function; 2) the randomness of distribution makes it difficult for hard carbon and soft carbon Realize uniform mixing; 3) The combination of soft and hard carbon is poor, the structure stability of the soft carbon shell is poor, and it is difficult to exert a synergistic effect; 4) It is difficult to accurately adjust K + Migration channel, etc.

Method used

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  • Soft and hard composite carbon as well as preparation method and application thereof
  • Soft and hard composite carbon as well as preparation method and application thereof
  • Soft and hard composite carbon as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0058] Add 0.02mol sodium hydroxide and 200.0mL deionized water into a beaker to form a solution, add 3mmoL perylenetetracarboxylic dianhydride, stir for 6h to obtain a mixed solution A of fluorescent green, add 6mmoL melamine to solution A, and stir for 3h , to obtain the precursor solution B, titrate the solution B with hydrochloric acid to be acidic under the stirring state, stir for 2 hours, obtain an orange suspension, filter it with suction and dry it at 60°C; transfer the dried product into a powder and transfer it to a tube furnace for argon Atmosphere, 3°C min -1 Heat up to 600°C for 2 hours; then 4°C for min -1 Heat up to 800°C for 2 hours; last 5°C for min -1 Raise the temperature to 1200°C for 3 hours to obtain a black soft-hard composite carbon-potassium battery material; use an intelligent Fourier transform infrared spectrometer to test and analyze the soft-hard composite carbon precursor, and the results are as follows figure 1 As shown, it shows that the prep...

Embodiment 2

[0062] Embodiment 2 (comparative example):

[0063] Add 0.02mol of sodium hydroxide and 200.0mL of deionized water into a beaker to form a solution, add 3mmol of perylenetetracarboxylic dianhydride, and stir for 6 hours to obtain a mixed solution A of fluorescent green. Under stirring, use hydrochloric acid to titrate solution A to make it acidic , stirred for 2 hours, suction filtered and dried at 60°C; the dried and ground powder product was transferred to a tube furnace under argon atmosphere, 3°C min -1 Heat up to 600°C for 2 hours; then 4°C for min -1 Heat up to 800°C for 2 hours; last 5°C for min -1 Raise the temperature to 1200°C for 3 hours to obtain a black soft carbon potassium battery material; analyze the composition and structure of the product by X-ray powder diffraction; analyze and test the morphology of the product by scanning electron microscopy, the results are as follows Figure 12 , as shown in 13, the characteristic peak of carbon can be found around 25...

Embodiment 3

[0065] Add 0.02mol sodium hydroxide and 200.0mL deionized water into a beaker to form a solution, add 3mmoL perylenetetracarboxylic dianhydride, stir for 6h, and obtain a mixed solution A of fluorescent green, add 4mmoL melamine into solution A, and stir for 3h , to obtain the precursor solution B, titrate the solution B with hydrochloric acid to be acidic under the stirring state, stir for 2 hours, obtain an orange suspension, filter it with suction and dry it at 60°C; transfer the dried product into a powder and transfer it to a tube furnace for argon Atmosphere, 3°C min -1 Heat up to 600°C for 2 hours; then 4°C for min -1 Heat up to 800°C for 2 hours; last 5°C for min -1 Raise the temperature to 1200°C for 3 hours to obtain a black soft-hard composite carbon-potassium battery material; analyze the composition and structure of the product by X-ray powder diffraction; analyze and test the morphology of the product with a scanning electron microscope, and the results obtained...

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Abstract

The invention discloses soft and hard composite carbon and a preparation method and application thereof. The soft and hard composite carbon is a hollow granular material obtained by polymerizing a soft carbon precursor and a hard carbon precursor to form a peptide bond and then carbonizing the peptide bond; the hard carbon precursor is selected from a melamine analogue; the soft carbon precursor is selected from anhydride compounds. The hollow structure of the soft and hard composite carbon can effectively relieve the volume expansion effect of the electrode material in the charging and discharging process.

Description

technical field [0001] The application relates to a soft-hard composite carbon and its preparation method and application, belonging to the field of material chemical energy. Background technique [0002] Lithium-ion batteries have been hailed as the greatest invention in the past thirty years. However, the lack of lithium resources on the earth and the manufacturing cost of extravagant instruments make it face unprecedented challenges in wide commercialization. In contrast, potassium-ion batteries are approximately three times more earth-abundant than lithium and have relatively low manufacturing process costs; therefore, they are considered as promising energy storage systems. In recent years, amorphous carbon-based materials have been considered as a promising anode material for potassium ions due to their advantages such as low manufacturing cost, mature technology route, and controllable interlayer spacing. Moreover, soft carbon, which combines excellent conductivity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/133
CPCH01M4/587H01M4/133
Inventor 何海勇程博士尹波郭泽浩
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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