Water-based slurry for high-solid-content diaphragm as well as preparation method and application of water-based slurry

By using the secondary particles obtained by demulsifying and washing the PVDF emulsion as the base material, a high solid content aqueous slurry was prepared, which solved the problems of low solid content and complex process in the preparation of the aqueous slurry of lithium-ion battery separator, and achieved high Stability and low energy consumption industrial production.

CN119108756APending Publication Date: 2024-12-10ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH CO LTD +1
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Patent Information

Application Number
CN202310669334.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-06-07
Publication Date
2024-12-10

AI Technical Summary

Technical Problem

The existing lithium-ion battery separator aqueous PVDF slurry preparation process has problems such as low solid content, long process flow, dust pollution and high energy consumption.

Method used

The secondary particles obtained by demulsification and washing of PVDF emulsion were used as the base material to control the average particle diameter D50 of the secondary particles to be 1 to 30 μm, and a high solid content aqueous slurry with a rotation viscosity of 50 to 500 mPa.s was prepared to reduce spraying. Drying steps to reduce energy consumption and avoid dust pollution.

Benefits of technology

The obtained slurry particles have large particle sizes, will not clog the pores of the diaphragm, have high stability, convenient transportation and storage, simple process, and are suitable for industrial production.

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Abstract

The invention discloses water-based slurry for a high-solid-content diaphragm and a preparation method and application of the water-based slurry, the water-based slurry for the high-solid-content diaphragm comprises 10-30 wt% of polyvinylidene fluoride resin and 0.5-5 wt% of a water-based binder, the polyvinylidene fluoride resin is polyvinylidene fluoride secondary particles, the average particle size D50 of the polyvinylidene fluoride secondary particles is 1-30 [mu] m, and the average particle size D50 of the water-based binder is 1-30 [mu] m. The rotary viscosity of the water-based slurry for the high-solid-content diaphragm is 50 to 500mPa. S. According to the preparation method, the polyvinylidene fluoride secondary particles with specific average particle size are used, the water-based slurry for the diaphragm, which is high in solid content, long in stabilization time and good in adhesive property, can be obtained, the polyvinylidene fluoride secondary particles are used, the steps of dewatering, drying and the like of polyvinylidene fluoride are not needed, the technological process is shortened, and the cost is saved.
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Citation Information

Patent Citations

  • Post-treatment method for polyvinylidene fluoride emulsion

    CN110078846A

  • Water-based PVDF (Polyvinylidene Fluoride) slurry for lithium ion battery as well as preparation method and application thereof

    CN113140870A

  • Preparation method of water-based PVDF coated lithium ion battery diaphragm

    CN116207437A