Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery

A lithium-ion battery and graphite material technology, applied in the field of coating agents, can solve the problems of uneven coating, poor rate performance and high impedance, and achieve the effects of uniform coating, reduced impedance and good rate performance.

Pending Publication Date: 2021-04-16
NINGBO SHANSHAN NEW MATERIAL TECH
5 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of uneven coating, poor rate performance and high impedance of the coated graph...
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Abstract

The invention discloses a coating agent, a modified graphite material, a preparation method and application of the modified graphite material, and a lithium ion battery. The coating agent comprises coumarone resin and wash oil, wherein a mass ratio of the coumarone resin to the wash oil is (1-3): 1. The coating agent and graphite are mixed according to a ratio of (7-15): 100 and carbonized to prepare the modified graphite material. The modified graphite material is uniform in coating and high in tap density. When the modified graphite material is used for preparing the lithium ion battery, the initial discharge efficiency of the prepared lithium ion battery is higher than or equal to 93.5%, the impedance of the lithium ion battery is significantly reduced, and the rate capability of the lithium ion battery is good.

Application Domain

GraphiteCell electrodes +1

Technology Topic

Lithium electrodeDischarge efficiency +5

Image

  • Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery
  • Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery
  • Coating agent, modified graphite material, preparation method and application of modified graphite material, and lithium ion battery

Examples

  • Experimental program(2)
  • Comparison scheme(1)
  • Effect test(1)

Example Embodiment

[0048] Example 1
[0049](1) Preparation of artificial graphite: set the particle size as D50 to be 9.5um. The petroleum coke is heat-treated in a horizontal coating kettle at a heating temperature of 630°C for 8 hours, and the protective gas used is high-purity nitrogen to obtain a heat-treated graphite intermediate product; Graphitization treatment is carried out at a temperature of 3000°C for 35 hours in a graphitization furnace, and artificial graphite can be obtained after natural cooling.
[0050] (2) Preparation of coating agent: put coumarone resin and industrial washing oil with a mass ratio of 2:1 in a 5000mL three-neck flask, heat to 110°C, and stir at a speed of 80r/min at the same time, stirring The time is 1 hour to ensure that the two components are evenly dispersed. After cooling in the air, pour it out, and the formed mixed solution is the coating agent.
[0051] (3) Preparation of coated graphite material: the artificial graphite prepared in step (1) and the coating agent in step (2) are mixed in a fusion machine according to a mass ratio of 12:100, and the mixing conditions are normal temperature 25°C and In the air atmosphere, the speed of the fusion machine is 280r/min, and the fusion time is 15min. The fusion process can realize the dispersion and uniform coating of the coating agent and aggregate.
[0052] (4) Carbonization treatment: heat the coated graphite material obtained in step (3) in a calcination furnace under an inert atmosphere; keep the temperature at 1150°C for 22 hours to obtain a modified graphite material, and its D50 is 10-13um .

Example Embodiment

[0053] Example 2
[0054] The difference from Example 1 is that the mass ratio of coumarone resin: washing oil is 3:1, and the remaining steps are all the same as in Example 1.
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PUM

PropertyMeasurementUnit
Particle size9.5µm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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