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Highly porous separator film having partial lamination

A technology of porosity and coating, applied in the field of preparing the film, can solve the problems of high cost, poor penetration resistance, high tearing tendency, etc.

Inactive Publication Date: 2014-11-05
TREOFAN GERMANY GBMH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength in the transverse direction is still insufficient here, so the penetration resistance is poor and a high tendency to tear in the longitudinal direction results
Overall the method is costly

Method used

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  • Highly porous separator film having partial lamination
  • Highly porous separator film having partial lamination
  • Highly porous separator film having partial lamination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0174] Calcium pimelate as nucleating agent was mixed with particles of isotactic polypropylene homopolymer (melting point 162° C.; MFI 3 g / 10 min) and propylene block copolymer at a concentration of 0.04% by weight in a mixer and Melting in a twin-screw extruder (shell temperature is 240 ° C and 200 l / min -1 ). After the extrusion process the melt was extruded from a wide slot nozzle at an extrusion temperature of 245°C to form a monolayer film. The film has the following composition:

[0175] About 50% by weight of a propylene homopolymer (PP) having a soluble fraction of n-heptane (based on 100% PP) of 4.5% by weight and a melting point of 165°C; and at 230°C and a load of 2.16 kg The melt flow index (DIN 53 735) of 3.2g / 10min under, and

[0176] About 49.96% by weight of a propylene-ethylene-block copolymer having an ethylene proportion of about 5% by weight based on the block copolymer and a melt flow index of 6 g / 10 min (230 ℃ and 2.16kg)

[0177] 0.04 wt% nanoscale...

Embodiment 2

[0191] After the extrusion process, a single-layer prefabricated film is extruded from a wide-slot nozzle at an extrusion temperature of 240 to 250°C. The preformed film is first drawn on chill rolls and cooled. The preformed film is then oriented in the longitudinal and transverse directions and finally set. The film has the following composition:

[0192] About 60% by weight of highly isotactic propylene homopolymer (PP) with 97% 13 C-NMR isotacticity and n-heptane soluble ratio of 2.5% by weight (based on 100% PP) and a melting point of 165°C; and a melt of 2.5g / 10min at 230°C and a load of 2.16kg flow index (DIN 53 735), and

[0193] About 20% by weight of HDPE (High Density Polyethylene) having a density of 0.954 (ISO 1183) and an MFI of 0.4 g / 10min (ISO 1133 / D) at 190°C and a load of 2.16 kg or at 190°C and an MFI (ISO 1333 / G) of 27 g / 10 min under a load of 21.6 kg and a melting point of 130°C (DSC: peak at a heating rate of 10°C / min), the melting range starts at 125...

Embodiment 3

[0216] A dispersion of TiO2 in isopropanol (Table 1, coating 3) was applied on a microporous BOPP film (film example 1) with a wire wound rod (wire diameter: 0.3 mm). After drying in a drying cabinet at 90° C. for 30 minutes, the application weight of the coating was determined by weighing and the air permeability was determined according to the Gurley value. Only a slight increase in Gurley values ​​was observed. The REM-photograph shows a partial area of ​​the film filled with particles.

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Abstract

The invention relates to a biaxially oriented, single or multilayer porous film comprising at least one porous layer, said layer containing at least one propylene polymer, wherein (i) the porosity of the porous film is 30% to 80%, and (ii) the permeability of the porous film is ˂ 1000s (Gurley value). The invention is characterized in that (iii) the porous film is provided with a partially inorganic, preferably ceramic lamination, and (iv) in that the laminated porous film has a Gurley value of ˂ 1200s. The invention further relates to a method for producing such a film, and to the use thereof in high-energy or high-performance systems, in particular in lithium batteries, lithium ion batteries, lithium polymer batteries, and alkaline earth batteries.

Description

technical field [0001] The present invention relates to coated porous membranes and their use as separators, as well as methods of producing said membranes. Background technique [0002] Modern devices require energy sources that can be used independently in space, such as batteries or accumulators. The disadvantage of batteries is that they must be disposed of. Therefore accumulators (secondary batteries) are increasingly being used, which can be recharged in the power supply system by means of charging devices. Conventional nickel-cadmium accumulators (NiCd accumulators) can, for example, achieve a service life of approximately 1000 charging cycles when used properly. In high-energy systems or high-power systems, lithium batteries, lithium-ion batteries, lithium-polymer batteries and alkaline-earth metal batteries are increasingly used as accumulators. [0003] Batteries and accumulators always consist of two electrodes immersed in an electrolyte solution and a separato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M2/14H01M50/403H01M50/406H01M50/417H01M50/434H01M50/443H01M50/449H01M50/491
CPCH01M2/1686H01M10/0525H01M2/145H01M2/1646H01M2/1653H01M2/166H01M50/403H01M50/446H01M50/449H01M50/443H01M50/491H01M50/417H01M50/434H01M50/406Y02E60/10Y02P70/50H01M10/052H01M50/411H01M50/431H01M10/4235
Inventor D·布什B·施米茨D·克莱恩
Owner TREOFAN GERMANY GBMH & CO KG
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