Material surface electrostatic self-assembling cladding method

An electrostatic self-assembly and coating technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of equipment, high energy consumption requirements, and the uniformity of the coating layer is not too high, and achieve the effect of uniform coating

Inactive Publication Date: 2014-05-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of machinery industry technology, physical coating between two different substances can be realized under specific equipment conditions, but this coating method has high requirements for equipment and energy consumption, and the uniformity of the coating layer not too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ultrasonic dispersion of lithium iron phosphate with a D50 of 1.5 μm in a solution of critical gelatin concentration of triethanolamine, after filtration, washing with absolute ethanol, centrifugation, and vacuum drying at 80°C for 5 hours, the surface-modified cation daughter particle material was prepared ; The D50 is 10 μ m nickel cobalt lithium manganese oxide dispersed in the solution of the critical gelatin concentration of isooctyl phosphate, after filtration, centrifugation after washing with absolute ethanol, and vacuum drying at 120 ℃ for 2 hours, the surface modified Anionic parent particle material. In the absolute ethanol solution while ultrasonically adding, respectively configure a daughter particle solution with a mass concentration of 1% and a 20% mother particle solution, and in the state of stirring the mother particle solution, the equal mass of the daughter particle solution was added at a rate of 10mL / min. Add it to the mother particle solution at ...

Embodiment 2

[0023] Ultrasonic dispersion of lithium iron phosphate with a D50 of 0.5 μm in the critical gel concentration solution of polyacrylamide, after filtration, washing with absolute ethanol, centrifugation, and vacuum drying at 120°C for 10 hours, the daughter particles with surface-modified cations were prepared. Materials: Nickel cobalt lithium manganese oxide with a D50 of 5 μm is ultrasonically dispersed in a solution of critical gelatin concentration of fatty alcohol polyoxyethylene ether carboxylate, filtered, washed with absolute ethanol, centrifuged, and vacuum-dried at 50°C for 5 hours. The parent particle material with the anion modified on the surface is prepared. In the absolute ethanol solution, ultrasonically added, the mass concentration of 5% of the daughter particle solution and 10% of the mother particle solution were respectively prepared, and in the state of stirring the mother particle solution, the equal mass of the daughter particle solution was added at a ra...

Embodiment 3

[0025] Conductive graphite with a D50 of 0.3 μm was ultrasonically dispersed in a polyacrylamide solution with a critical gelatin concentration, filtered, washed with absolute ethanol, centrifuged, and vacuum-dried at 100°C for 2 hours to prepare a surface-modified cationic sub-particle material ; The lithium manganate with a D50 of 2.5 μm was ultrasonically dispersed in the critical gelatin concentration solution of isooctyl ether phosphate, filtered, washed with absolute ethanol, centrifuged, and vacuum-dried at 80°C for 5 hours to prepare a surface-modified Anionic parent particle material. In the absolute ethanol solution, ultrasonically added, the mass concentration of 0.5% sub-particle solution and 25% mother particle solution were respectively prepared, and in the state of stirring the mother particle solution, the sub-particle solution of equal mass was added at a rate of 5mL / min. Add it to the mother particle solution at a speed of 1000°C, stir for 20 minutes after th...

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PUM

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Abstract

The invention discloses a material surface electrostatic self-assembling cladding method. The method comprises the following steps: carrying out surface modification on primary particles and secondary particles by adopting ionic surfactants having different charge states to obtain primary particles and secondary particles having different surface charge properties, controlling the concentrations of the surface modified primary particles and the surface modified secondary particles in a dispersion solvent to effectively clad the primary particles, and carrying out centrifugation, drying, heat treatment and the like to obtain a primary particle modified material with a uniform cladding layer. The electrostatic action between different ionic surfactants promotes the uniform and tight distribution of the secondary particles in the periphery of the primary materials in order to realize a uniform cladding effect, so a non-uniform cladding phenomenon caused by chemical cladding, mechanical cladding and the like adopted in general cladding technologies is avoided.

Description

technical field [0001] The invention relates to a material surface electrostatic self-assembly coating method. Background technique [0002] In recent years, lithium battery materials have been widely used in portable electronic devices, mainly because lithium-ion batteries have the advantages of high energy density, no memory effect, environmental protection and pollution-free, and long life. However, as the new energy industry's requirements for lithium batteries in terms of capacity and power continue to increase, lithium battery materials need to be continuously improved in performance, which mainly focuses on the surface coating modification of materials, such as lithium iron phosphate materials. Coating the carbon layer to improve the conductivity of the material itself has become one of the main methods for modifying lithium iron phosphate materials. Patents CN102306791A, CN101269808A, CN101901903A and CN102097619A all disclose different carbon sources as raw material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/62H01M4/625Y02E60/10
Inventor 刘大军王启岁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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