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Improved coated separators for lithium batteries and related methods

A lithium battery, separator technology, applied in the manufacture and use of such separators, membranes, films with aqueous or water-based polymer coatings, the manufacture or use of such coated separators, the manufacture and use of such In the field of separators with ceramic coatings, it can solve the problems of difficult disposal, undesired emissions, and solvents that are not environmentally friendly, and achieve the effect of improving energy density

Inactive Publication Date: 2017-09-26
CELGARD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-aqueous solvents used to dissolve PVDF are often volatile and may require careful use, disposal and / or recycling as these solvents may not be environmentally friendly and may produce unwanted emissions if not disposed of properly
Coating processes based on non-aqueous systems can be costly, may have an unfavorable environmental footprint, and, due to safety concerns related to their flammability, may be difficult to dispose of

Method used

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  • Improved coated separators for lithium batteries and related methods
  • Improved coated separators for lithium batteries and related methods
  • Improved coated separators for lithium batteries and related methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A water-based PVDF / ceramic coating slurry was prepared by uniformly dispersing 25 g of high-purity alumina particles with 18.7 g of Formulation #1; wherein the alumina particles had a D50 average particle size of 0.65 μm, 0.8 g / cm 3 bulk density (bulktapped density), 4.6m 2 BET surface area per gram; Formulation #1 is a 50:50 blend of Formulation #2 and Formulation #3, which are two aqueous solutions or suspensions of PVDF:HFP (from Pennsylvania, USA) Arkema Inc. of King of Prussia, belonging to Latex product line), the difference between the two lies in the content of HFP, which will be explained in more detail below. Mixing was made more intensive by first pre-wetting the alumina particles with the solution or suspension of Formulation #1. Dispersion was accomplished using a Silverson high shear L4M-5 mixer at 5000 rpm for 12 minutes at room temperature. Spread the slurry by hand with a spatula on the On the surface of 2400PP microporous membrane (by dry process...

Embodiment 2

[0084] An aqueous based PVDF / ceramic coating slurry was prepared by uniformly dispersing 39 g of high purity alumina particles with 16.8 g of the PVDF blend of Formulation #1 described in Example 1; wherein the alumina particles had a D50 average particle size of 0.65 μm Diameter, 0.8g / cm 3 bulk density, 4.6m 2 / g of BET surface area. Mixing was made more intensive by first pre-wetting the alumina particles with the solution or suspension of Formulation #1. Dispersion was accomplished by first mixing with a Silverson high shear L4M-5 mixer at 5000 rpm at room temperature for 12 minutes, followed by mixing with a ball mill mixer (MTI Shimmy ball mill mixer) for 20 minutes. The ceramic / PVDF slurry was manually spread on the On the surface of the 2400PP microporous membrane (example 1 above describes the characteristics of the membrane), moisture was removed by drying in an oven at 79°C. figure 2A SEM of the surface of this coated separator membrane is shown at 10,000X magn...

Embodiment 3

[0086] A water-based PVDF / ceramic coating slurry was prepared by mixing and uniformly dispersing 66 g of high-purity alumina particles with 23.5 g of Formulation #2; wherein the alumina particles had a D50 average particle size of 0.65 μm, 0.8 g / cm 3 bulk density, 4.6m 2 / g of BET surface area, recipe #2 is from Arkema Latex preparations are generally described as an aqueous suspension of water and PVDF:HFP, wherein water constitutes 55-65%, PVDF:HFP has a melting point in the range of about 114°C-120°C. Mixing was made more intensive by first pre-wetting the alumina particles with the solution or suspension of formulation #2. Dispersion was accomplished by first mixing with a Silverson high shear L4M-5 mixer at 3000 rpm at room temperature for 5 minutes, followed by mixing with a ball mill mixer (MTIShimmy ball mill mixer) for 20 minutes. Spread the slurry by hand with a spatula on the On the surface of EK0940 polyethylene microporous membrane (film prepared by wet proce...

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Abstract

In accordance with at least selected embodiments, new or improved ceramic coated separators, membranes, films, or the like for use in lithium batteries, new or improved batteries including such ceramic coated separators, membranes, films, or the like, and methods of making or using such ceramic coated separators, membranes, films or the like are disclosed. In accordance with at least certain embodiments, new or improved aqueous or water-based polymeric coated separators, membranes, films, or the like are disclosed. In accordance with at least particular embodiments, new or improved aqueous or water-based polyvinylidene fluoride (PVDF) or polyvinylidene difluoride (PVDF) homopolymer or co-polymers of PVDF with hexafluoropropylene (HFP or [-CF(CF3)-CF2-]), chlorotrifluoroethylene (CTFE), vinylidene fluoride (VF2-HFP), tetrafluoroethylene (TFE), and / or the like, blends and / or mixtures thereof, coated separators, membranes, films or the like, new or improved porous separators for use in lithium batteries, new or improved coating or application methods for applying a coating or ceramic coating to a separator for use in a lithium battery, new or improved PVDF or PVDF:HFP films or membranes, and / or the like are disclosed.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to and benefit of co-pending US Provisional Patent Application No. 62 / 087,953, filed December 5, 2014, which is hereby incorporated by reference in its entirety. technical field [0003] This application discloses a variety of new, optimized or improved coated separators, membranes, thin films, etc. for use in lithium batteries (such as lithium ion batteries or lithium ion polymer batteries), the new or improved include Batteries of such coated separators, membranes, thin films, etc., and methods of making or using such coated separators, membranes, thin films, etc. According to at least selected embodiments, aspects or objects, the present application discloses new, optimized and / or improved separators with ceramic coatings for use in lithium batteries, such as lithium-ion batteries or lithium-ion polymer batteries. Plates, membranes, films, etc., new or improved batteries comprising such ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/414H01M50/434H01M50/449H01M50/457H01M50/489
CPCH01M10/0525H01M2220/20H01M50/44H01M50/403H01M50/449H01M50/489H01M50/414H01M50/434H01M50/457Y02E60/10Y02P70/50H01M50/417H01M50/426H01M50/446H01M50/409H01M50/4295H01M10/052H01M50/451H01M50/454H01M50/443
Inventor 张正铭何金波李学法全寅植石烈吉尔·V·沃森
Owner CELGARD LLC
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