A kind of ceramic slurry for lithium battery diaphragm and its preparation and application method

A technology of lithium battery diaphragm and ceramic slurry, which is applied in the field of electrochemistry to achieve the effects of strong piercing ability, good resistance to electrolyte corrosion, and good stability

Active Publication Date: 2020-08-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are few preparation methods for ceramic slurry at present, especially for the convenience of industrial production. The slurry has good stability, small sedimentation, and adjustable viscosity. The ceramic coating after coating has good adhesion, no powder falling, and There are fewer methods with strong impact, extrusion, puncture ability, and good resistance to electrolyte corrosion

Method used

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  • A kind of ceramic slurry for lithium battery diaphragm and its preparation and application method
  • A kind of ceramic slurry for lithium battery diaphragm and its preparation and application method
  • A kind of ceramic slurry for lithium battery diaphragm and its preparation and application method

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Experimental program
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Effect test

Embodiment 1

[0023] First, disperse the dispersant into the solvent, then add the ceramic powder, and fully stir and mix in the double planetary mixer; at the same time, mix the binder and solvent in the double planetary mixer; after the two slurries are mixed evenly, The mixed slurry of the ceramic powder is added to the mixed slurry of the binder. Then turn on the double planetary mixer, firstly stir at a low speed, shear at a low speed, and scrape the wall at intervals for 2-6 hours. After all the large particles in the slurry are dispersed, start rapid stirring and high-speed shearing for 1-4 hours until the slurry is evenly mixed. Finally, take a little slurry and test the viscosity, solid content and settlement.

[0024] The preparation method is: firstly weigh 1wt% PEG (polyethylene glycol) and dissolve it in the aqueous solution, stir and dissolve it fully, then add 90wt% boehmite powder, the particle size is D50=0.5μm, double planetary stirring The speed is 5rpm, the dispersion ...

Embodiment 2

[0029] First weigh 5wt% PVP and dissolve it in NMP, stir and dissolve it fully, then add 80wt% alumina powder, the particle size is D50=0.2μm, the double planetary stirring speed is 3rpm, the dispersion speed is 600rpm, after 8min Scrape the wall; then adjust the stirring rate to 12rpm, the dispersion rate to 1000rpm, scrape the wall after 15min, then adjust the stirring rate to 30rpm, the dispersion rate to 1600rpm, and continue stirring for 1.5h. At the same time, 15wt% of PVDF was dispersed into NMP at a stirring rate of 15rpm and a dispersion rate of 900rpm. After 10min, the wall was scraped, then vacuum stirred at a stirring rate of 40rpm and a dispersion rate of 1400rpm, and stirred for 2h. Finally, add the dispersed ceramic slurry to the glue, turn on the agitator, the stirring rate is 10rpm, the dispersion rate is 500rpm, scrape the wall after 20min, turn on the vacuum, adjust the stirring rate to 30rpm, and the dispersion rate is 1300rpm. The viscosity of the material...

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Abstract

The invention belongs to the field of electrochemistry, and in particular relates to a preparation and application method of a ceramic slurry for a lithium battery. Ceramic slurry is composed of ceramic powder, binder, solvent, and dispersant. The main component of ceramic powder is one or two of alumina and boehmite powder. The binder is mainly organic, inorganic or Combination of the two, the solvent is water, NMP, acetone or a combination of each other. The method disclosed by the invention is simple and suitable for industrialized production. The prepared slurry has the characteristics of small settlement and adjustable viscosity. The coated ceramic separator has good adhesion, no powder falling, strong impact resistance, extrusion, puncture ability, good resistance to electrolyte corrosion, and can effectively improve the safety performance of the battery.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a slurry for lithium battery separators. Background technique [0002] A lithium-ion battery consists of a positive electrode, a negative electrode, an electrolyte, a separator, and packaging. The diaphragm is located between the positive and negative electrodes of the lithium-ion battery, separating the positive and negative electrodes, avoiding direct contact between the positive and negative electrodes to cause local short circuits, and reducing battery defects and reliability and safety issues caused by self-discharge. The commonly used lithium-ion battery separator material is polyolefin separator. The closed cell temperature of the wet PE film is generally 120-130°C, and the membrane rupture temperature is generally 140-150°C; the closed cell temperature of the dry PP diaphragm is generally 150-160°C, and the membrane rupture temperature is generally 170-180°C. W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/409
CPCH01M50/409Y02E60/10
Inventor 刘强许志浩白宝生
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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