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Multi-layer coated inorganic particle, preparation method thereof, water-based functional coating slurry, lithium battery diaphragm and lithium battery

A multi-layer coating, inorganic particle technology, used in lithium batteries, non-aqueous electrolyte batteries, battery components and other directions, can solve problems such as unfavorable battery usage, low conductivity, etc., to improve battery hardness, reduce moisture content, The effect of reducing resistance

Active Publication Date: 2021-06-08
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]However, PVDF-HFP tends to swell in the electrolyte, and locks a part of the electrolyte to form a gel state, which causes it to be affected by temperature. When the temperature is low The conductivity of this substance is low, which is not conducive to the use of batteries in low-temperature environment areas

Method used

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  • Multi-layer coated inorganic particle, preparation method thereof, water-based functional coating slurry, lithium battery diaphragm and lithium battery
  • Multi-layer coated inorganic particle, preparation method thereof, water-based functional coating slurry, lithium battery diaphragm and lithium battery

Examples

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Effect test

Embodiment 1

[0039] This example introduces the preparation of several layers of coated inorganic particles.

[0040] The preparation method of No. 1 multi-layer coated inorganic particles comprises the following steps:

[0041] Step 1: Add alumina particles (particle size: 1.0 μm) into the reaction kettle, and add PVDF-HFP mixture under the reaction environment with temperature of 150°C and pressure of 2Mpa, and keep it under the reaction environment for 7h to obtain the molten mixture ; The mass ratio of the inorganic flame retardant particles and PVDF-HFP is 2:1;

[0042] Step 2: Spray-dry the molten mixture obtained in Step 1 to obtain PVDF-HFP-coated inorganic particles; the particle size of the obtained PVDF-HFP-coated inorganic particles is 1.8 μm.

[0043] Step 3: Mix the obtained PVDF-HFP-coated inorganic particles with polyvinyl alcohol, the mass ratio of PVDF-HFP-coated inorganic particles to polyvinyl alcohol is 1.5:1, and embed the polyvinyl alcohol into the PVDF-HFP package ...

Embodiment 2

[0053] A method for preparing a water-based functional coating slurry containing multi-layer coated inorganic particles, comprising the following steps:

[0054] Step a: Mix and stir the water and dispersant for 10 minutes, add multi-layer coated inorganic particles and stir, and then grind for 90 minutes through a sand mill to obtain a dispersion liquid, and the speed of the sand mill is 1200 rpm;

[0055] Step b: Add a thickener to the dispersion obtained in step a, and stir for 30 minutes at 800 rpm;

[0056] Step c: adding a wetting agent and a binder, and stirring at 800 rpm for 30 minutes to obtain a water-based functional coating slurry containing multi-layer coated inorganic particles.

[0057] Prepare the following water-based functional coating slurry according to the above-mentioned preparation method:

[0058] No. 1 water-based functional coating slurry, including the following components by weight: 40 parts of No. 1 multi-layer coated inorganic particles, 5 parts...

Embodiment 3

[0070] No. 1 lithium battery separator, including a 12 μm PE base film and the No. 1 water-based functional coating slurry prepared in Example 2 to coat the coating formed on one side of the base film, the coating method is gravure coating, and the coating thickness is 2μm, the coating effect is good, and the film surface is uniform and smooth.

[0071] No. 2 lithium battery separator, including a 12 μm PE base film and the No. 2 water-based functional coating slurry prepared in Example 2 to coat the coating formed on one side of the base film, the coating method is gravure coating, and the coating thickness is 2μm, the coating effect is good, and the film surface is uniform and smooth.

[0072] No. 1a lithium battery diaphragm, No. 1b lithium battery diaphragm, No. 1c lithium battery diaphragm and No. 1 lithium battery diaphragm are only different in that No. 1a coating slurry, No. 1b coating slurry, and No. 1c coating slurry are used respectively Replace No. 1 water-based f...

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Abstract

The invention discloses a multi-layer coated inorganic particle, a preparation method thereof, a water-based functional coating slurry formed by the multi-layer coated inorganic particle, a lithium battery diaphragm and a lithium battery. The multi-layer coated inorganic particles are divided into three layers, the inner layer is inorganic flame-retardant particles, the middle layer is viscous organic matter PVDF-HFP, and the outer layer is coated with polyvinyl alcohol organic matter. And the PVDF-HFP in the middle layer can provide good adhesion, prevents the staggered layers of the pole piece and the diaphragm, and has good ionic conductivity at high temperature. The polyvinyl alcohol on the outer layer has good low-temperature ionic conductivity and adhesion, and makes up for the deficiency of ionic conductivity of PVDF-HFP at low temperature.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a multilayer coated inorganic particle and a preparation method thereof, a water-based functional coating slurry formed therefrom, a lithium battery separator and a lithium battery. Background technique [0002] With the increasing demand for battery energy density, the addition of high-nickel, silicon-carbon and other emerging materials is increasing. While these materials provide high capacity, they have significant cyclic shrinkage and expansion during charge and discharge, resulting in electrode-diaphragm - The pole group system composed of electrodes twists and deforms and even forms gaps during peristalsis, which will affect the shape of the battery and cause the battery pack to bulge, or lead to lithium deposition on the surface of the negative electrode, causing safety hazards such as internal short, self-discharge, natural explosion, etc. ; [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L27/16C08L27/20C08L29/04C08K3/22H01M50/449H01M50/446H01M50/431H01M10/052
CPCC08J3/126C08J3/122H01M10/052C08J2327/16C08J2327/20C08J2429/04C08K3/22Y02E60/10
Inventor 张伟袁海朝徐锋苏碧海邢鹏李嘉辉杨振图杜全国
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD