Coating method of lithium ion battery cathode material

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of uneven coating layer, difficult coating, and uncontrollable size of coating material, and achieve uniform particle size distribution. , Improve the coating efficiency, the effect of significant industrialization significance

Active Publication Date: 2018-11-06
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects in the coating of lithium-ion battery positive electrode materials in the prior art that coating is difficult, the coating layer is uneven, the coating material reacts with the solvent, and the size of the coating material is uncontrollable, the present invention provides a lithium-ion battery The method of positive electrode material coating

Method used

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  • Coating method of lithium ion battery cathode material
  • Coating method of lithium ion battery cathode material
  • Coating method of lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation of LiNi 0.6 co 0.2 mn 0.2 o 2 (NCM622) coated with 0.2wt% Al 2 o 3 sample. Dissolve 10% aluminum sol in deionized water to prepare a concentration of 2wt% Al 2 o 3 aluminum sol coating solution. Turn on the disc nest mill to preheat, so that the inlet temperature is 200°C, the outlet temperature is 100°C, the host speed is 2000 rpm, and the air flow rate is 4000 cubic meters / hour; then press LiNi 0.6 co 0.2 mn 0.2 o 2 The solid powder feed rate is 400 kg / hour, the liquid feed rate is 80 kg / hour, and the solid and liquid raw materials are input into the disc nest mill for reaction simultaneously; the reaction obtains a lithium-ion battery cathode material with a coating layer. The lithium-ion battery positive electrode material of the obtained coating layer is continuously transported to the collector under the action of fan suction, and finally the coated product is collected by the collector. The wind speed of the fan is 20 m / s.

[0058] from ...

Embodiment 2

[0060] Preparation of LiMn 2 o 4 Sample coated with 0.3% MgO. Magnesium acetate is dissolved in ethanol to prepare a magnesium acetate coating solution with a concentration of 5 wt%. Turn on the disc nest mill to preheat, so that the inlet temperature is 250°C, the outlet temperature is 80°C, the host speed is 1500 rpm, and the air flow rate is 3000 cubic meters / hour; then press LiMn 2 o 4 The solid powder feed rate is 200 kg / hour, the liquid feed rate is 20 kg / hour, and the solid and liquid raw materials are input into the disc nest mill for reaction simultaneously; the reaction obtains a lithium-ion battery cathode material with a coating layer. The lithium-ion battery positive electrode material of the obtained coating layer is continuously transported to the collector under the action of fan suction, and finally the coated product is collected by the collector. The wind speed of the fan is 10 m / s.

[0061] figure 2 LiMn coated with MgO 2 o 4 Transmission electron ...

Embodiment 3

[0063] Preparation of LiCoO 2 Coated with 0.8% TiO 2 sample. Using titanium sol as the coating source, add deionized water to dilute to form a titanium oxide coating solution with a concentration of 5%. Turn on the disc nest mill to preheat, so that the inlet temperature is 300°C, the outlet temperature is 120°C, the host speed is 2400 rpm, and the air flow rate is 4000 cubic meters / hour; then press LiCoO 2 The solid powder feed rate is 500 kg / hour, the liquid feed rate is 80 kg / hour, and the solid and liquid raw materials are input into the disc nest mill for reaction simultaneously; the lithium-ion battery cathode material with a coating layer is obtained. The lithium-ion battery positive electrode material of the obtained coating layer is continuously transported to the collector under the action of fan suction, and finally the coated product is collected by the collector. The wind speed of the fan is 10 m / s.

[0064] image 3 For coated TiO 2 LiCoO 2 The transmissio...

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Abstract

The invention discloses a coating method of a lithium ion battery cathode material. According to the method, disk-nest grinding equipment is utilized to continuously input a lithium ion battery cathode material to be covered into a disk-nest grinder in a form of solid powder, solid powder is dispersed by an impeller and a disk which rotate at a high speed in a cavity of the disk-nest grinder, multiple nest type rotational flows are formed between the disk and a special lining plate, and air flow impact force between the disk and the special lining plate can fully disperse the solid powder; meanwhile, the rotation speed can be controlled to make a powder material keep morphology or be smashed; furthermore, a coating material can enter the disk-nest grinder in a form of solution or slurry ina mist spray mode and can evenly contact certain-temperature solid powder particles to be covered to finish coating. By means of the lithium ion battery cathode material coating method, a traditionalcoating technology for an existing lithium ion battery cathode material is greatly simplified, productivity is remarkably improved, a product coating effect is greatly improved, and cost is obviouslyreduced.

Description

technical field [0001] The invention relates to a coating method for a positive electrode material of a lithium ion battery, belonging to the field of preparation of positive electrode materials of a lithium ion battery. Background technique [0002] Lithium-ion batteries have significant advantages such as high working voltage, high specific energy, good safety, and high energy density, and are currently the most competitive secondary batteries. Its electrochemical performance mainly depends on the degree and stability of the redox reaction of the electrode material used in the electrolyte. The former determines the energy output of the battery, and the latter determines the charge and discharge life of the battery. Since lithium-ion batteries need to work at higher voltages (generally 3-4.3V), the stability of the electrode / electrolyte interface is the key to cycle life. Since the currently used lithium-ion battery cathode materials are generally inorganic powder particle...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 胡国荣杜柯彭忠东
Owner CENT SOUTH UNIV
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