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Low-crystallization-degree coating material and preparation method thereof, anode material and lithium battery anode

A technology of negative electrode material and crystallinity, applied in the field of materials, can solve problems such as affecting the first charge and discharge efficiency of graphite

Active Publication Date: 2020-10-16
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology is usually to coat a layer of amorphous carbon on the outside of artificial graphite. Although this method can effectively reduce the DCR (direct current resistance) of lithium-ion batteries and improve the dynamic performance of graphite, it is at the expense of the energy density of the negative electrode material. , will also affect the first charge and discharge efficiency of graphite

Method used

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  • Low-crystallization-degree coating material and preparation method thereof, anode material and lithium battery anode
  • Low-crystallization-degree coating material and preparation method thereof, anode material and lithium battery anode

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preparation example Construction

[0033] The application provides a method for preparing a coating material with low crystallinity, which mainly includes:

[0034] mixed Al 2 o 3 Nanoparticles and pitch, heat treatment to carbonize the pitch.

[0035] Will Al 2 o 3 Nanoparticles are mixed with pitch, and the pitch is carbonized by heat treatment to form a microcrystalline structure, Al 2 o 3 The nanoparticles can prevent the further fusion and expansion of the microcrystalline structure, and obtain a coating material with a lower crystallinity; the crystallinity of the coating material is lower than that of conventional soft carbon. Using the coating material to coat graphite can obtain more lithium intercalation sites, which is beneficial to improving the energy density of the material.

[0036] In some embodiments of the present application, Al with a particle size of 20nm-200nm is used 2 o 3 Nanoparticles; within this particle size range, a coating material with a lower degree of crystallization can...

Embodiment 1

[0062] This embodiment provides a negative electrode material, which is mainly prepared through the following steps:

[0063] Artificial graphite, pitch, Al with a particle size of 20-50nm 2 o 3 Mix according to the mass ratio of 92:8:0.7, put the mixed material in the reaction kettle, heat and stir under the protection of inert gas, raise the temperature to 500°C at 5°C per minute, keep warm for 6H, and discharge the material to obtain graphite-coated materials .

[0064] The graphite coating material and sodium alginate aqueous solution were put into the kneading pot, and the mass ratio of graphite coating material to sodium alginate was 97.5:2.5. The mixture was stirred at room temperature for 30 min, and then kneaded in an inert atmosphere at 100-120° C. to remove moisture to obtain a negative electrode material.

Embodiment 2

[0066] This embodiment provides a negative electrode material, which is mainly prepared through the following steps:

[0067] Artificial graphite, pitch and Al with a particle size of 50-80nm 2 o 3 Mix at high speed according to the mass ratio of 95:5:0.26, put the mixed material in the reaction kettle, heat and stir under the protection of inert gas, raise the temperature to 600°C at 5°C per minute, keep it warm for 4H, and discharge the material to obtain a graphite-coated material .

[0068] The graphite coating material and chitosan aqueous solution were put into the kneading pot, and the mass ratio of graphite coating material to chitosan was 98.5:1.5. The mixture was stirred at room temperature for 30 min, and then kneaded in an inert atmosphere at 100-120° C. to remove moisture to obtain a negative electrode material.

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Abstract

The invention relates to the field of materials, in particular to a low-crystallization-degree coating material and a preparation method thereof, an anode material and a lithium battery anode. The preparation method of the low-crystallization-degree coating material mainly comprises the following steps: mixing Al2O3 nanoparticles and asphalt, and carrying out heat treatment to carbonize the asphalt. Al2O3 nano particles are mixed with asphalt, carbonizing the asphalt to form a microcrystalline structure through heat treatment, so that the Al2O3 nano particles can prevent the microcrystalline structure from being further fused and expanded to obtain a coating material with a low crystallization degree, and the crystallization degree of the coating material is lower than that of conventionalsoft carbon. More lithium intercalation sites can be obtained by coating graphite with the coating material, and the energy density of the material can be improved.

Description

technical field [0001] The present application relates to the field of materials, in particular, to a coating material with low crystallinity and a preparation method thereof, negative electrode material and lithium battery negative electrode. Background technique [0002] Surface coating is a common method to improve the kinetic properties of graphite. The existing technology is usually to coat a layer of amorphous carbon on the outside of artificial graphite. Although this method can effectively reduce the DCR (direct current resistance) of lithium-ion batteries and improve the dynamic performance of graphite, it is at the expense of the energy density of the negative electrode material. , will also affect the first charge and discharge efficiency of graphite. Contents of the invention [0003] The purpose of the embodiments of the present application is to provide a coating material with low crystallinity and its preparation method, negative electrode material and lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/587H01M4/62H01M4/133H01M10/0525C01F7/02C01B32/05C01B32/21B82Y30/00
CPCH01M4/0471H01M4/587H01M4/62H01M4/628H01M4/133H01M10/0525C01F7/021C01B32/05C01B32/21B82Y30/00H01M2004/027C01P2004/80Y02E60/10
Inventor 佘英奇胡孔明王志勇任娜娜
Owner HUNAN SHINZOOM TECH
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