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Polyethylene composition for manufacturing lithium battery diaphragm

A lithium battery separator and polyethylene technology, which is applied in battery pack parts, circuits, electrical components, etc., can solve the problems of low puncture resistance and tensile strength of lithium battery separators, and the thickness of the separator, and achieve superior tensile strength. Properties and elongation at break, effect of improved tensile film-forming properties, best tensile strength and puncture resistance

Inactive Publication Date: 2015-06-03
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects that the existing polyethylene lithium battery diaphragm is too thick, and the puncture resistance and tensile strength of the lithium battery diaphragm are low, and provide a polyethylene film composition for manufacturing lithium battery diaphragms

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 30 parts by weight of polyethylene material are mixed with 70 parts by weight of liquid paraffin, wherein the proportion of polyethylene material is that every 100 parts by weight of polyethylene material contains 10 parts by weight of a molecular weight of 7×10 6 Ultra-high molecular weight polyethylene resin, the molecular weight of 70 parts by weight is 3×10 6 Ultra-high molecular weight polyethylene resin and 20 parts by weight with a molecular weight of 7×10 5 high-density polyethylene resin. Extruded by a twin-screw extruder and salivated through a die to form a 0.4mm thick film billet. After pre-extraction, stretching, extraction of diluent, setting and annealing, a 16 μm thick lithium battery separator is prepared. See attached table 1 for specific stretching process and film properties.

Embodiment 2

[0029] 35 parts by weight of polyethylene material are mixed with 65 parts by weight of microporous filling oil, wherein the proportion of polyethylene material is that every 100 parts by weight of polyethylene material contains 1 part by weight of molecular weight of 8 × 10 6 Ultra-high molecular weight polyethylene resin, the molecular weight of 55 parts by weight is 4.5×10 6 44 parts by weight of ultra-high molecular weight polyethylene resin and a molecular weight of 4.5×10 5 high-density polyethylene resin. Extruded by a twin-screw extruder and salivated through a die to form a 0.4mm thick film billet. Pre-extraction, stretching, extraction of diluent, setting and annealing to prepare 8 μm thick lithium battery separator. See attached table 1 for specific stretching process and film properties.

Embodiment 3

[0031] 15 parts by weight of polyethylene material are mixed with 85 parts by weight of white oil, wherein the ratio of polyethylene material is that every 100 parts by weight of polyethylene material contains 15 parts by weight of a molecular weight of 9×106 Ultra-high molecular weight polyethylene resin, the molecular weight of 60 parts by weight is 4×10 6 of ultra-high molecular weight polyethylene resin and 25 parts by weight with a molecular weight of 8×10 5 high-density polyethylene resin. Extruded by a twin-screw extruder and salivated through a die to form a 0.4mm thick film billet. Pre-extraction, stretching, extraction of diluent, setting and annealing to prepare 8 μm thick lithium battery separator. See attached table 1 for specific stretching process and film properties.

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PUM

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Abstract

The invention discloses a polyethylene composition for manufacturing a lithium battery diaphragm. The composition is prepared by blending a polyethylene material and a diluent. Polyethylene resins of different molecular weights are taken as polyethylene materials for manufacturing a lithium battery diaphragm, and are uniformly mixed and blended with a diluent to form a polyethylene composition, so that the lithium battery diaphragm is prepared. The polyethylene material used in the invention is an ordinary super-high-molecular-weight polyethylene resin, a super-high-molecular-weight polyethylene resin or a high-density polyethylene resin. The battery diaphragm prepared from the polyethylene composition has low requirement on the accuracy of manufacturing equipment and high production efficiency, has high tearing strength, high piercing resistance and smaller thickness while keeping the high porosity, high insulating property and high shutoff property of an ordinary polyethylene lithium battery, and is suitable for manufacturing a smaller lithium battery.

Description

technical field [0001] The invention relates to a polyethylene composition for manufacturing lithium-ion battery separators. Background technique [0002] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. Nowadays, in order to meet the needs of beauty and portability, battery factories make the battery cells very small, such as in some electronic products such as mobile phones and digital cameras. At the same time, in order to pursue high energy density (in a small volume) Can accommodate more electrode materials), battery manufacturers hope that the thickness of the separator as thin as possible, which puts forward higher requirements...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06H01M2/16
CPCY02E60/10
Inventor 叶钢李兰汪前东刘必前
Owner INST OF CHEM CHINESE ACAD OF SCI
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