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High-porosity separator film with coating and shut down function

A technology of porosity and coating, applied in the field of film preparation, can solve the problems of unsatisfactory mechanical strength, poor penetration resistance and high tearing tendency

Inactive Publication Date: 2014-08-20
TREOFAN GERMANY GBMH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their mechanical strength in the transverse direction is still unsatisfactory here, so that their penetration resistance is poor and their tendency to tear in the longitudinal direction is high
Overall, this approach is cost-intensive

Method used

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  • High-porosity separator film with coating and shut down function
  • High-porosity separator film with coating and shut down function
  • High-porosity separator film with coating and shut down function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] A silicate coating having the composition of Coating 1 (Table 1) was manually applied onto a microporous BOPP membrane with a cut-off function (Film Example 1) using a wire knife coater (wire diameter: 0.4 mm). Wetting of the membrane with the ceramic suspension was uniform. The coated film was then dried in a drying oven at 90° C. for one hour. After drying, the coating showed good adhesion to the film. Next, the coating weight, the layer thickness of the coating and the air permeability are determined by means of the Gurley value. Only a small increase in the Gurley value was observed, from 360s to 380s.

Embodiment 2

[0174] A silicate coating with the composition of Coating 2 (Table 1 ) was manually applied onto a microporous BOPP film with cut-off function (film example 1 ) using a wire knife coater (wire diameter: 0.4 mm). After coating, the wetting of the membrane with the ceramic suspension was uniform. After drying, the coating, as in Example 2, showed better adhesion than in Example 5. The Gurley value also increased significantly. Observe that the Gurley value increases from 360s to 570s.

Embodiment 3

[0176] A titanium oxide coating having the composition of Coating 3 (Table 1 ) was manually applied onto a microporous BOPP film with cut-off function (film example 1 ) using a wire knife coater (wire diameter: 0.4 mm). After coating, the wetting of the membrane with the ceramic suspension was uniform. After drying, the coating showed good adhesion to the film. An increase in the Gurley value is observed, from 360s to 460s.

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Abstract

The invention relates to a biaxially oriented single-layer or multilayer porous film, which comprises at least one porous layer, wherein said layer contains at least one propylene polymer and polyethylene, (i) the porosity of the porous film is 30% to 80%, and (ii) the permeability of the porous film is < 1000 s (Gurley value), characterized in that (iii) the porous film has an inorganic, preferably ceramic, coating, (iv) the coated porous film has a Gurley value of < 1500 s, and (v) the coated porous film has a Gurley value of > 6000 s when said film is heated above 140 DEG C for 5 min. The coated, porous film has a double safeguard. The invention further relates to a method for producing such a film and to the use thereof in high-energy or high-power systems, in particular in lithium, lithium-ion, lithium-polymer and alkaline-earth batteries.

Description

technical field [0001] The present invention relates to coated porous membranes with double safety and their use as separators, as well as processes for the production of said membranes. Background technique [0002] Modern devices require energy sources that can be utilized spatially independently, such as batteries or accumulators. The disadvantage of batteries is that they must be disposed of. For this reason, accumulators (secondary batteries) are increasingly being used, which can be recharged repeatedly by means of charging devices connected to the power supply system. For example, a conventional nickel-cadmium battery (NiCd-battery) can achieve a service life of approximately 1000 charge cycles with proper use. [0003] Lithium, lithium-ion, lithium-polymer and alkaline-earth metal batteries are increasingly used as accumulators in high-energy or high-performance systems. [0004] Batteries and accumulators always consist of two electrodes immersed in an electrolyt...

Claims

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Application Information

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IPC IPC(8): B32B27/32B29C55/00B29C55/12C08J5/18C08K5/00C08K5/098H01M2/14H01M2/16H01M50/403H01M50/406H01M50/417H01M50/42H01M50/423H01M50/434H01M50/451H01M50/491
CPCB29C71/0009H01M10/4235C08K5/098H01M10/052B29C47/0021B29K2023/0641B29C55/143B29C47/0057B29K2023/14B29K2995/0053B29C55/023H01M2/145B32B2307/518B29K2105/04B29K2023/065B29C55/14H01M2/1686B29L2031/3468B29K2023/12C08J2323/10B32B27/32B29C55/005B32B2255/10H01M2/1646C08K5/0083B32B2255/20C08J5/18B32B2457/10H01M2/1653B29C48/08B29C48/0018Y02E60/10H01M50/403H01M50/417H01M50/406H01M50/451H01M50/491H01M50/434H01M50/423H01M50/42C08L23/10C08J5/22C08L23/04B29D7/01H01M50/449H01M50/411H01M50/431
Inventor B·施米茨D·布什D·克莱恩
Owner TREOFAN GERMANY GBMH & CO KG
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