Graphite negative electrode material and preparation method and application thereof

A graphite negative electrode and graphite material technology, applied in the direction of graphite, negative electrodes, chemical instruments and methods, etc., can solve problems such as poor economy, adverse effects on processing performance, technical bottlenecks in improving effects, etc., and achieve enhanced stability and high initial viscosity and peel strength, good modification or coating effect

Pending Publication Date: 2022-05-03
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it has been widely used in the industry, but the improvement effect has reached the technical bottleneck, and the controllability of the production process is poor, the economy is poor, and it also has adverse effects on the capacity and processing performance of the material.

Method used

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  • Graphite negative electrode material and preparation method and application thereof
  • Graphite negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of a graphite negative electrode material, comprising the following preparation steps:

[0036] S1: Raw material micronization treatment; mechanically pulverize the artificial graphite material to obtain raw material powder with an average particle size of 8.0-11 μm;

[0037] S2: Modification heat treatment: Premix the raw material powder in step S1 with traditional asphaltene auxiliary materials (softening point 120-180°C), and viscosifying modified coating agent according to the weight ratio of 90:8:2 to make them uniformly dispersed, Then put the mixed material into a horizontal kettle for heat treatment, the treatment temperature is 750°C, the equipment rotation frequency is 50HZ, and the heat treatment material is obtained;

[0038] S3: Particle regularization treatment; the heat-treated material obtained in step S2 is subjected to particle shaping treatment, and the particle morphology is further controlled and modified by equipment mechanical...

Embodiment 2

[0043]A preparation method of a graphite negative electrode material, comprising the following preparation steps:

[0044] S1: Raw material micronization treatment; mechanically pulverize the artificial graphite material to obtain raw material powder with an average particle size of 8.0-11 μm;

[0045] S2: Modification heat treatment: pre-mix the raw material powder in step S1 with traditional asphaltene auxiliary materials (softening point 120-180°C) at a weight ratio of 90:10 to make them evenly dispersed, and then put the mixed materials into a horizontal kettle for heat treatment , the treatment temperature is 750°C, and the rotation frequency of the equipment is 50HZ to obtain heat-treated materials;

[0046] S3: Particle regularization treatment; the heat-treated material obtained in step S2 is subjected to particle shaping treatment, and the particle morphology is further controlled and modified by equipment mechanical impact or shear force to obtain a regularized mater...

Embodiment 3

[0051] A preparation method of a graphite negative electrode material, comprising the following preparation steps:

[0052] S1: Raw material micronization treatment; mechanically pulverize the artificial graphite material to obtain raw material powder with an average particle size of 8.0-11 μm;

[0053] S2: Modification heat treatment: Premix the raw material powder in step S1 with traditional asphaltene auxiliary materials (softening point 120-180°C), and viscosifying modified coating agent according to the weight ratio of 90:8:2 to make them uniformly dispersed, Then put the mixed material into a horizontal kettle for heat treatment, the treatment temperature is 750°C, the equipment rotation frequency is 50HZ, and the heat treatment material is obtained;

[0054] S3: Particle regularization treatment; the heat-treated material obtained in step S2 is subjected to particle shaping treatment, and the particle morphology is further controlled and modified by equipment mechanical...

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Abstract

The invention discloses a graphite negative electrode material as well as a preparation method and application thereof, and the graphite negative electrode material comprises a graphite material, a traditional asphaltene auxiliary material and a tackifying type modified coating agent, the tackifying modified coating agent is added as a modifier before graphitization of the graphite material and/or is added as a carbon-coated modifier after graphitization of the graphite material, and the tackifying modified coating agent is one or more than two of hydrogenated petroleum resin, terpene resin, coumarone resin and liquid tackifying resin. According to the graphite negative electrode material disclosed by the invention, secondary particles of the graphite negative electrode material are formed by adding the tackifying type modified coating agent, and the tackifying type modified coating agent is added on the basis of granulation of the graphite material or is independently used to replace a traditional asphaltene auxiliary material, so that the elasticity, modulus and cohesive strength of self-adhesive modified asphalt can be reduced; therefore, higher initial adhesion and peel strength are obtained, and the stability of the asphalt can be enhanced to a certain extent, so that a better modification or coating effect is achieved.

Description

technical field [0001] The invention relates to the technical field of new energy lithium-ion battery negative electrode materials, in particular to a graphite negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of relatively light weight, large storage capacity, and no memory effect, so they are widely used. Many electronic devices now use lithium-ion batteries as the host power supply. Especially in the field of digital electronics, due to the small size of equipment and limited battery space, strict requirements are placed on the energy density and expansion of lithium-ion batteries. [0003] At present, lithium-ion batteries mainly use artificial graphite as the negative electrode material. The common artificial graphite negative electrode materials on the market mainly include primary particles and secondary particles. Compared with the primary particles, the secondary par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/21H01M4/583H01M10/0525
CPCC01B32/205C01B32/21H01M4/583H01M10/0525H01M2004/027
Inventor 谢俊申玉良葛传长仰永军
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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