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Coal-based carbon negative electrode material, preparation method and application thereof, and battery containing coal-based carbon negative electrode material

A negative electrode material, coal-based technology, applied in the field of coal-based carbon negative electrode materials and its preparation, can solve the problems of unfavorable industrial production and commercial development, unsatisfactory fast charging performance, low initial Coulombic efficiency, etc., and achieve excellent sodium ion intercalation , low price, and the effect of reducing environmental pollution

Pending Publication Date: 2022-04-12
上海杉杉新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of low initial coulombic efficiency, unsatisfactory fast charging performance, complex production process, and unfavorable industrial production and commercial development of the negative electrode materials of sodium ion batteries existing in the prior art, and provide A coal-based carbon negative electrode material, its preparation method and application, and a battery containing it are disclosed

Method used

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  • Coal-based carbon negative electrode material, preparation method and application thereof, and battery containing coal-based carbon negative electrode material
  • Coal-based carbon negative electrode material, preparation method and application thereof, and battery containing coal-based carbon negative electrode material
  • Coal-based carbon negative electrode material, preparation method and application thereof, and battery containing coal-based carbon negative electrode material

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Experimental program
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Embodiment 1

[0083] ①Pretreatment of coal-based raw materials

[0084] Firstly, the cleaned coal is crushed until the D50 is 50 μm, and then it is put into an electric heating ribbon mixer and continuously fed with air for oxidation operation. The volume of the pulverized coal-based raw material is equal to the effective volume of the electric heating ribbon mixer 50%, the temperature is raised to 200°C, and the ventilation frequency is 0.2 times / min. After continuing to heat up to 250°C, the temperature was raised to 350°C at a rate of 20°C / hour, and the oxidation time was 6 hours. After the reaction, the material was cooled to room temperature and then pulverized and sieved by air flow to obtain coal powder with a D50 of 8 μm and a volatile content of 8%.

[0085] ②Low temperature heat treatment

[0086]Add coal tar pitch with a mass percentage of 5%, a softening point of 180°C, a residual carbon value of 38%, and a D50 of 5 μm to the pretreated coal powder, mix evenly in a fusion mach...

Embodiment 2

[0090] 1. the pretreatment of coal-based raw material: with embodiment 1

[0091] 2. low temperature heat treatment: with embodiment 1

[0092] ③High temperature heat treatment

[0093] The low-temperature heat-treated material was put into an argon-protected ceramic tube furnace. Under normal pressure, the air exchange frequency was 0.3 times / min. The material was maintained at 1500°C for 3 hours to obtain a coal-based carbon negative electrode material. The argon gas is 0.05 times / minute according to the ventilation frequency.

Embodiment 3

[0095] 1. the pretreatment of coal-based raw material: with embodiment 1

[0096] ②Low temperature heat treatment

[0097] Add anthracene with a mass percentage of 15% to the pretreated coal powder, mix evenly in the fusion machine, put it into the rotary furnace, and perform low-temperature heat treatment. Air is first introduced, and the air exchange frequency is 0.2 times / min, 3°C / min Raise the temperature to 360°C and keep it for 3 hours, switch to nitrogen protection, the ventilation frequency is 0.05 times / min, and raise the temperature to 600°C at 3°C / min and keep it for 3 hours, and the specific surface area is 3m 2 / g, the modified coal powder with a volatile content of 5%.

[0098] 3. high temperature heat treatment: with embodiment 2

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Abstract

The invention discloses a coal-based carbon negative electrode material, a preparation method and application thereof, and a battery containing the coal-based carbon negative electrode material. The preparation method comprises the following steps: S1, pretreating a coal-based raw material to obtain pulverized coal; the D50 of the pulverized coal is 1-35 [mu] m; the pretreatment sequentially comprises crushing, oxidation and re-crushing; s2, volatile organic compounds and the pulverized coal are evenly mixed, then low-temperature heat treatment is conducted, and modified pulverized coal is obtained; and S3, carrying out high-temperature heat treatment on the modified coal powder to obtain the coal-based carbon negative electrode material. The lithium battery and the sodium battery taking the coal-based carbon as the negative electrode material have relatively good electrical properties, and meet the commercial performance requirements of the lithium ion battery and the sodium ion battery with high energy density and high first coulombic efficiency; the method is especially suitable for the lithium battery field, the sodium ion battery field and the super capacitor field in the fields of consumer electronics, large-scale energy storage, low-cost batteries, low temperature and the like.

Description

technical field [0001] The invention relates to a coal-based carbon negative electrode material, a preparation method and application thereof, and a battery containing the same. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronics and energy because of their advantages such as high energy density, long cycle life, stable operation, environmental protection and no pollution. Graphite material, as a traditional raw material for preparing lithium-ion battery anode materials, has the advantages of definite crystalline form, stable performance, low potential platform, and mature processing technology. However, artificial graphite materials require a graphitization process above 2500 °C. It needs to consume a lot of energy and auxiliary materials, lose insulation materials, and release environmentally harmful substances such as dust, nitrogen oxides, and sulfides. [0003] For lithium batteries, the distribution of lithium as a raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054
CPCY02E60/10
Inventor 潘福森张秀云聂顺军朱从连王旭峰李虹
Owner 上海杉杉新材料有限公司
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