Hard carbon material and preparation method thereof

A technology of hard carbon and raw materials, applied in the field of hard carbon materials and their preparation, can solve the problems affecting the practical process of hard carbon materials, small lithium intercalation capacity and reversible capacity, and irregular layer structure, etc., and achieve large-scale application. Potential, improved electrochemical performance, good high-power discharge performance

Active Publication Date: 2018-12-07
北京英耐时新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, hard carbon is produced from petroleum raw materials, which requires a large amount of energy input, which is not conducive to environmental friendliness, has the disadvantages of high preparation cost, and the production process is not environmentally friendly.
In addition, due to the limitations of the preparation methods of existing hard carbon materials, their porosity is generally low, and the layer structure is not very regular, resulting in relatively small lithium intercalation capacity and reversible capacity of existing hard carbon materials, and poor low-temperature performance, which affects The practical progress of hard carbon materials in the field of lithium-ion batteries

Method used

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preparation example Construction

[0024] Its preparation method of hard carbon material of the present invention may further comprise the steps:

[0025] In the first step, the raw materials are initially fired, and the rice is heated in a steam heating furnace under an incomplete N2-protected reducing atmosphere at a temperature of 400-600°C and a heating time of 5-10 minutes to obtain a precursor.

[0026] The second step is coarse crushing, and the precursor is crushed to an average particle diameter of 5-50 μm.

[0027] The third step is carbonization. Under the protection of an inert atmosphere, the above pulverized material is coated with bincho carbon, and then reduced at a high temperature of 1000-1500 ° C for 1-20 hours.

[0028] The fourth step is fine pulverization, pulverizing the above-mentioned carbonized material, and the average particle diameter is about 10 μm. Through pulverization and micronization, the particle size of the material can be fine and uniform.

[0029] The fifth step is class...

Embodiment 1

[0034] The rice was heated in a steam heating furnace under a reducing atmosphere protected by incomplete nitrogen at a temperature of 500°C and a heating time of 7 minutes to obtain a precursor. The precursor is coarsely crushed to an average particle diameter of 5-50 μm. Under the protection of nitrogen in an inert atmosphere, use Bincho charcoal with a hardness between 20-22 degrees, a carbon content between 94-96%, and a carbon element content of 94-96% to cover the above pulverized material, and then reduce it at a high temperature of 1300 ° C. , high-temperature carbonization for 7h to obtain carbonized products. The above-mentioned carbonized material is finely pulverized, and the average particle diameter is about 10 μm. Further pass through an artificial ion-grade crusher and ball mill to a particle size of 4-10 μm.

Embodiment 2

[0036] The rice was heated in a steam heating furnace under a reducing atmosphere protected by incomplete nitrogen at a temperature of 550°C and a heating time of 5 minutes to obtain a precursor. The precursor is coarsely crushed to an average particle diameter of 5-50 μm. Under the protection of argon in an inert atmosphere, use Bincho charcoal with a hardness between 16-18 degrees, a carbon content between 93-95%, and a carbon content of 94-96% to coat the above-mentioned pulverized material, and heat it at 1100 ° C. Reduction, carbonization at high temperature for 15h, to obtain carbonized product. The above-mentioned carbonized material is finely pulverized, and the average particle diameter is about 10 μm. Further pass through an artificial ion-grade crusher and ball mill to a particle size of 4-10 μm.

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Abstract

The invention discloses a hard carbon material and a preparation method thereof. A natural component is used as a raw material, and through raw material primary calcination, coarse pulverization, special Binchotan coating carbonization, fine pulverization and classification, the best carbonization effect is obtained. The hard carbon is rich in amorphous microporous structures. Compared with the prior art, the preparation method has simple processes, a high yield, a low cost and a good large-scale application potential. The raw materials used in preparation are environmentally friendly. The electrochemical properties of the prepared hard carbon are obviously improved. The hard carbon material can be used in the preparation of lithium ion batteries, has good cycling and fast chargeability and excellent charge and discharge performances and is especially suitable for power batteries for electric vehicles with high power density and high energy density.

Description

technical field [0001] The invention relates to a hard carbon material and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] With the development of science and technology and the improvement of living standards, human beings have an increasing demand for multifunctional portable electronic devices and electric vehicles. Therefore, research on high energy density, good load characteristics, fast charging and discharging, high safety performance, long cycle life, Low-cost new lithium-ion batteries have become an important frontier field in the world. [0003] At present, carbon-based anode materials are selected as anode materials for lithium-ion batteries because of their low cost and electrochemical lithium intercalation hosts. Graphite material has the advantages of low electrode potential, long cycle life, good safety and low price, and has become the main negative electrode material for commercial lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/05
CPCC01B32/05H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李文迪石岩丁莹
Owner 北京英耐时新能源科技有限公司
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