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High Porosity Separator Membranes with Coating and Cutting Functions

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

Inactive Publication Date: 2017-05-24
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 Membranes with Coating and Cutting Functions
  • High Porosity Separator Membranes with Coating and Cutting Functions
  • High Porosity Separator Membranes with Coating and Cutting Functions

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 present invention relates to a biaxially oriented single or multilayer porous film comprising at least one porous layer and this layer contains at least one propylene polymer and polyethylene, (i) said porous film having a porosity of 30%-80 %; and (ii) said porous membrane has a permeability<1000s (Gurley value); it is characterized in that (iii) said porous membrane comprises an inorganic, preferably ceramic coating; and (iv) said coated The porous membrane of has a Gurley value of <1500s; and (v) said coated porous membrane has a Gurley value of >6000s when it is heated to over 140°C for 5 minutes. The coated porous membrane has double security. Furthermore, the invention relates to a method for the production of membranes of this type and their use in high-energy or high-performance systems, in particular lithium batteries, lithium-ion batteries, lithium-polymer batteries and alkaline earth metal 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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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B29C55/00B29C55/12C08J5/18C08K5/00C08K5/098H01M2/14H01M2/16H01M50/403H01M50/406H01M50/417H01M50/42H01M50/423H01M50/434H01M50/451H01M50/491
CPCB32B27/32B29C55/005C08J5/18C08K5/0083C08K5/098B29K2023/0641B29K2023/065B29K2023/12B29K2023/14B29K2105/04B29C55/023B29C55/143B32B2255/10B32B2255/20B32B2307/518B32B2457/10H01M10/052C08J2323/10B29C48/08B29C48/0018Y02E60/10H01M50/403H01M50/417H01M50/406H01M50/451H01M50/491H01M50/434H01M50/423H01M50/42C08L23/10C08J5/22C08L23/04B29C55/14B29D7/01H01M50/449H01M50/411H01M50/431B29C71/0009H01M10/4235B29K2995/0053B29L2031/3468
Inventor B·施米茨D·布什D·克莱恩
Owner TREOFAN GERMANY GBMH & CO KG