Spherical low-expansion high-capacity graphite anode material, preparation method and lithium ion battery

A graphite negative electrode and low-expansion technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of adverse effects on processing performance, low specific capacity, poor economy, etc., and achieve easy control of material quality and minimum spheroidization orientation The effect of increasing the degree of isotropy and isotropy

Active Publication Date: 2022-05-06
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the former, the industry has been widely used at present, but the improvement effect is not obvious, and the controllability of the production process is poor, the economy is poor, and it also has an adverse effect on the capacity and processing performance of the material.
As for the latter, although secondary spherical particles have always been a research hotspot and direction in the industry, the large-scale preparation technology of spherical artificial graphite that can achieve high capacity has not yet been overcome.
[0005] Patent CN106495144A mixes the raw coke with the coating material, then thermally polymerizes and coats it, and then composites and granulates to obtain the surface-coated composite artificial graphite carbon negative electrode material. This method improves the fast charging performance of the material to a certain extent, but the granular structure It does not have the characteristics of ultra-low expansion, and the process is complicated, so it is difficult to achieve stable control
Patent CN105633408A mixes carbon materials, adhesives and conductive agents into a slurry, sprays dry granules or extrudes and kneads granules, and then sinters, disperses, impregnates, sinters, disperses and graphitizes to obtain high-magnification graphite Negative electrode material, although this material has a spherical shape and high rate characteristics, but the specific capacity is low, the preparation process is complicated, and the cost is high

Method used

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  • Spherical low-expansion high-capacity graphite anode material, preparation method and lithium ion battery
  • Spherical low-expansion high-capacity graphite anode material, preparation method and lithium ion battery
  • Spherical low-expansion high-capacity graphite anode material, preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Petroleum coke with a volatile content of 5% is processed by a mechanical grinding-shaping integrated machine to obtain a primary particle A with an average particle size D50 of 7.5 μm, which contains 25% medium-temperature emulsified pitch and 4.5% cetyl trimethyl bromide The aqueous solution of ammonium (both mass fractions) and the primary particle A are put into the high-speed mixer at a mass ratio of 30:100, and stirred for 20min at a speed of 600rpm (linear velocity greater than 3m / s); then add 6% cracking oil slurry, 1.5% Tween-80, 0.5% AlCl3 (both mass fractions, relative to primary particle A) continue to stir with 800rpm rotating speed for 20min to obtain precursor B; under nitrogen protection, the temperature of precursor B is raised to Heat preservation at 600°C for 4 hours, then graphitize at 3000°C for 24 hours, discharge and sieve to obtain spherical graphite negative electrode material.

Embodiment 2

[0029] The needle coke with a volatile content of 5% is processed by a mechanical grinding-shaping integrated machine to obtain a primary particle A with an average particle diameter D50 of 7.5 μm, which will contain 35% sucrose and 4.5% Tween-20 (both mass fractions) The aqueous solution and the primary particle A are put into the high-speed mixer at a mass ratio of 35:100, and stirred for 20min at a speed of 600rpm (the linear velocity is greater than 3m / s); then add 8% washing oil (mass fraction, relative to the primary particle A ) continue to stir at 800rpm for 20min to obtain precursor B; under the protection of nitrogen, raise the temperature of precursor B to 600℃ at 5℃ / min for 4 hours, and then graphitize at 3000℃ for 24 hours, and the material is sieved A similar spherical graphite anode material was obtained.

Embodiment 3

[0031] The needle coke with a volatile content of 0.5% is processed by a rolling mill-shaping integrated machine to obtain a primary particle A with an average particle diameter D50 of 8.5 μm, which will contain 35% sucrose and 4.5% Tween-20 (both mass fractions ) and the primary particle A are put into a high-speed mixer at a mass ratio of 30:100, and stirred for 20min at a speed of 600rpm (the linear velocity is greater than 3m / s); then add 8% vegetable oil (mass fraction, relative to the primary particle A ) continue to stir at 800rpm for 20min to obtain precursor B; under the protection of nitrogen, raise the temperature of precursor B to 600℃ at 5℃ / min for 4 hours, and then graphitize at 3000℃ for 24 hours, and the material is sieved A similar spherical graphite anode material was obtained.

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Abstract

The invention discloses a method for preparing a spherical low-expansion and high-capacity graphite negative electrode material. The steps of the preparation method are as follows: grinding carbon-rich material raw materials to obtain primary particles A with a volume average particle diameter D50 of 0.1-30um; combining the primary particles A with The first additive is added according to the mass ratio of 100:0.2-300 and mechanically dispersed and mixed, then the second additive is added for mechanical homogeneous polymerization, the mass ratio of the second additive to the primary particle is 0.1-300:100, and the precursor is obtained B: Precursor B is heat treated and reacted for 1 to 6 hours in an inert atmosphere and controlled at a temperature of 400 to 2000°C; then graphitized at a temperature of 2500 to 3200°C for 12 to 48 hours; finally sieved to obtain Spherical low-expansion high-capacity graphite anode material. The method prepares high-compression, high-capacity, and low-expansion graphite negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a spherical low-expansion and high-capacity graphite negative electrode material, a preparation method and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have excellent properties such as high energy density, high working voltage, small size, fast charging and discharging, and long cycle life. They have been widely used in digital, portable devices, electric vehicles, and energy storage power stations. 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....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 仰永军葛传长
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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