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Surface-modified pyrolytic carbon material, battery and preparation method and application of surface-modified pyrolytic carbon material

A surface modification and pyrolysis carbon technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low initial charge and discharge efficiency, and achieve low cost, good adaptability and good safety. Effect

Pending Publication Date: 2021-04-16
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a surface-modified pyrolytic carbon material, battery and its preparation method and application in order to solve the defect of low initial charge and discharge efficiency of pyrolytic carbon materials in the prior art

Method used

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  • Surface-modified pyrolytic carbon material, battery and preparation method and application of surface-modified pyrolytic carbon material
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  • Surface-modified pyrolytic carbon material, battery and preparation method and application of surface-modified pyrolytic carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step (1): The coal tar pitch is heated up in the reactor to carry out the polymerization reaction. The temperature of the polymerization reaction is 100 ° C, the time of the polymerization reaction is 6 hours, and the material is discharged at room temperature; the material is transferred to the jet mill for jet pulverization and classification. Material A was obtained, and the particle size of material A was 15.6 μm;

[0045] Step (2): The material A and heavy oil coating agent prepared in step (1) are alternately added to the coating kettle under the condition of stirring, and the surface coating is carried out under the protection of nitrogen. Material A and heavy oil The mass ratio of oil to oil is 12:1; the surface coating temperature is 300°C, and the surface coating time is 3 hours to obtain material B;

[0046] Step (3): Under the protection of nitrogen, material B was carbonized at 1100°C for 4 hours; after that, the reaction product was cooled to room temperat...

Embodiment 2

[0048] Step (1): The coal tar pitch is heated up in the reactor to carry out the polymerization reaction, the temperature of the polymerization reaction is 150°C, the time of the polymerization reaction is 10h, and the material is discharged at room temperature; the material is transferred to the jet mill for jet pulverization and classification, Material A was prepared, and the particle size of material A was 20.8 μm;

[0049] Step (2): The material A and heavy oil coating agent prepared in step (1) are alternately added to the coating kettle under the condition of stirring, and the surface coating is carried out under the protection of nitrogen. Material A and heavy oil The mass ratio of oil to oil is 14:1; the surface coating temperature is 450°C, and the surface coating time is 5 hours to obtain material B;

[0050] Step (3): Under the protection of nitrogen, material B was carbonized at 1000°C for 3 hours; then the reaction product was cooled to room temperature, and then...

Embodiment 3

[0052] Step (1): Coal tar pitch is heated in the reaction kettle to carry out polymerization reaction. The temperature of the polymerization reaction is 200 ° C, the time of the polymerization reaction is 1 h, and the material is discharged at room temperature; the material is transferred to the jet mill for jet pulverization and classification, Material A is obtained, and the particle size of material A is 10.5 μm;

[0053] Step (2): The material A and the coal tar coating agent prepared in step (1) are alternately added to the coating kettle under the condition of stirring, and the surface coating is carried out under the protection of nitrogen, and the material A and the heavy The mass ratio of oil is 18:1; the surface coating temperature is 600°C, and the surface coating time is 5 hours to obtain material B;

[0054] Step (3): Under the protection of nitrogen, material B was carbonized at 1500°C for 2 hours; after that, the reaction product was cooled to room temperature, ...

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Abstract

The invention discloses a surface modified pyrolytic carbon material, a battery a preparation method and application of the surface modified pyrolytic carbon material. The preparation method of the surface-modified pyrolytic carbon material comprises the following steps: (1) carrying out polymerization reaction on asphalt, crushing and grading to obtain a material A, (2) performing surface coating on the material A and a coating material to obtain a material B, and (3) carrying out carbonization treatment and ball-milling screening on the material B to obtain a surface modified pyrolytic carbon material, wherein in the step (1), the particle size D50 of the material A is 6-30 microns, and in the step (2), the coating material is coal tar and / or heavy oil, the weight part ratio of the material A to the coating material is (10-18):1, and the surface coating temperature is 300-600 DEG C. The surface-modified pyrolytic carbon material prepared by the invention is high in initial charge-discharge efficiency and discharge capacity, good in cycle performance, relatively good in high-current charge-discharge performance, good in safety, relatively good in adaptability to electrolytic solution and other additives and small in batch difference.

Description

technical field [0001] The invention relates to a surface modified pyrolysis carbon material, a battery and a preparation method and application thereof. Background technique [0002] In recent years, with the depletion of oil reserves on the earth and the greenhouse effect caused by automobile exhaust emissions, lithium-ion batteries with the characteristics of small size, light weight and environmental protection have become a research hotspot. Pyrolytic carbon material, the raw material of lithium-ion batteries, has attracted much attention due to its firm and stable structure, which is more suitable for use under high-current charging and discharging. Its good safety performance is expected to be applied in electric vehicles. [0003] At present, the initial charge and discharge efficiency of existing pyrolytic carbon materials is low, and the capacity loss mainly comes from irreversible reactions on the surface of carbon materials. [0004] Therefore, there is an urgen...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/00
CPCY02E60/10
Inventor 薄维通谢秋生刘盼陈然
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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