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High-capacity and high-compaction artificial graphite negative electrode material, preparation method thereof and lithium ion battery

An artificial graphite negative electrode, high-pressure compaction technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow liquid absorption, easy overpressure, etc., achieve fast infiltration, high compaction density, and improve electrochemical performance Effect

Inactive Publication Date: 2018-09-18
CHINA AVIATION LITHIUM BATTERY LUOYANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a high-capacity and high-compression artificial graphite negative electrode material, so as to solve the problems of easy overpressure and slow liquid absorption in the existing artificial graphite negative electrode material under high pressure

Method used

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  • High-capacity and high-compaction artificial graphite negative electrode material, preparation method thereof and lithium ion battery
  • High-capacity and high-compaction artificial graphite negative electrode material, preparation method thereof and lithium ion battery
  • High-capacity and high-compaction artificial graphite negative electrode material, preparation method thereof and lithium ion battery

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Effect test

Embodiment 1

[0024] The high-capacity and high-pressure compacted artificial graphite negative electrode material of this embodiment is prepared by the following steps:

[0025] 1) Grinding calcined petroleum coke and calcined coal-based needle coke into D 50 Particle size is 10μm, tap density is 0.60g / cm 3 raw material powder;

[0026] 2) Add calcined petroleum coke raw material powder and calcined coal-series needle coke raw material powder to the mixer according to the mass ratio of 60:40, and mix them evenly with auxiliary material pitch to obtain a mixture. The mass ratio of raw material powder to auxiliary material pitch is 100:5;

[0027] 3) Put the mixture in N 2 Under protection, heat treatment at 600°C for 10h in a vertical kettle, and then raise the temperature to 3200°C for graphitization treatment for 40h, and the graphitized products are mixed and sieved to obtain the artificial graphite negative electrode material.

[0028] The lithium ion battery of the present embodime...

Embodiment 2

[0030] The high-capacity and high-pressure compacted artificial graphite negative electrode material of this embodiment is prepared by the following steps:

[0031] 1) Grinding calcined petroleum coke and calcined coal-based needle coke into D 50 Particle size is 10μm, tap density is 0.60g / cm 3 raw material powder;

[0032] 2) Add calcined petroleum coke raw material powder and calcined coal-based needle coke raw material powder to the mixer at a mass ratio of 70:30, and mix them with auxiliary material asphalt to obtain a mixture. The mass ratio of raw material powder to auxiliary material asphalt is 100:5;

[0033] 3) Put the mixture in N 2 Under protection, heat treatment at 560°C for 12 hours in a vertical kettle, and then raise the temperature to 3100°C for graphitization treatment for 45 hours, and the graphitized products are mixed and sieved to obtain the artificial graphite negative electrode material.

[0034] The lithium-ion battery of this example is prepared b...

Embodiment 3

[0036] The high-capacity and high-pressure compacted artificial graphite negative electrode material of this embodiment is prepared by the following steps:

[0037] 1) Grinding calcined pitch coke and calcined coal-based needle coke into D 50 Particle size is 10μm, tap density is 0.60g / cm 3 raw material powder;

[0038] 2) Put calcined pitch coke raw material powder and calcined coal-based needle coke raw material powder into the mixer at a mass ratio of 80:20, and mix them with auxiliary material pitch to obtain a mixture. The mass ratio of raw material powder to auxiliary material pitch is 100:10;

[0039] 3) put the mixture in N 2 Under protection, heat treatment at 700°C for 8 hours in a vertical kettle, and then raise the temperature to 3300°C for graphitization treatment for 40 hours, and the graphitized products are mixed and sieved to obtain the artificial graphite negative electrode material.

[0040] The lithium-ion battery of this example is prepared by using th...

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Abstract

The invention relates to a high-capacity and high-compaction artificial graphite negative electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the steps of selecting at least two of pitch coke, petroleum coke and needle coke as graphite raw materials, and uniformly mixing with a coating agent to obtain a mixed material; and performing graphitization on the mixed material at 3,000-3,300 DEG C under a protection atmosphere to obtain the high-capacity and high-compaction artificial graphite negative electrode material. According to the preparation method of the high-capacity and high-compaction artificial graphite negative electrode material, the problem that the material is easy to press excessively due to inappropriate selection of theraw material cokes is solved by selection and matching of raw material cokes with different hardness, and the prepared graphite negative electrode material has appropriate hardness and rebound rate.A pole plate prepared from the artificial graphite negative electrode material is high in compaction density, an electrolyte is rapidly immersed, and the electrochemical performance of the lithium ionbattery is prolonged.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and in particular relates to a high-capacity and high-pressure compacted artificial graphite negative electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] As a high-performance rechargeable battery, lithium-ion battery has broad application prospects in portable electronic equipment, electric vehicles, space technology, defense industry, etc., and has become a research hotspot that has attracted widespread attention in recent years. Lithium-ion batteries have performance advantages such as high energy density, wide operating voltage window, no pollution, fast charge and discharge, and long cycle life. With the development of lithium-ion battery technology, various industries have higher and higher requirements for their performance, including long Cycle, high rate and high energy density, etc., especially improving energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/1393H01M10/0525
CPCH01M4/1393H01M4/583H01M10/0525Y02E60/10
Inventor 高娇阳万爽李利淼
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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