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Polyester lithium ion battery diaphragm and preparation method

A lithium-ion battery, polyester film technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of inability to produce porous polyester film, complex manufacturing process, high production cost, and achieve high mechanical properties and The effect of dimensional stability, reasonable pore size and porosity, and low production cost

Active Publication Date: 2015-06-17
合肥长阳新材料科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of the existing lithium-ion battery diaphragm manufacturing process complex or high production costs, in order to solve the existing technology can not produce porous polyester film can be used as lithium-ion battery diaphragm defects, the invention provides a polyester Lithium-ion battery diaphragm and preparation method thereof, namely providing a porous polyester film used as lithium-ion battery diaphragm and preparation method thereof
The present invention adopts polyester as the separator material of lithium ion battery. The polyester material has excellent electrical insulation, electrolyte corrosion resistance and electrochemical stability, and has high mechanical properties and thermal stability. Added as filler particles to polyester raw materials, through phase separation technology, the interpenetrating microporous membrane material is prepared, thus solving the permeability problem of lithium ion electrolyte

Method used

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  • Polyester lithium ion battery diaphragm and preparation method
  • Polyester lithium ion battery diaphragm and preparation method
  • Polyester lithium ion battery diaphragm and preparation method

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preparation example Construction

[0038] (2) Preparation of polyester base film containing inorganic filler particles

[0039] The above-mentioned polyester film substrate raw materials are prepared on a polyester film stretching production line produced by Mitsubishi Heavy Industries, Japan. The preparation steps of the base film are as follows: mix the calculated polyester raw material slices (polyester bright raw material slices) with the polyester masterbatch slices containing inorganic filler particles, melt and extrude the cast sheets after drying, and the obtained thick slices are in the Stretch 3-4 times in the longitudinal direction at 90-110°C, stretch 3-4 times in the transverse direction at 85-115°C, heat-set at 220-230°C, wind up after cooling, and finally make the thickness 4μm-32μm The polyester base film, the polyester base film referred to as the base film.

[0040] For the base film with a thickness of more than 32 μm, it is prepared by using a small static stretching machine in the laborato...

Embodiment 1

[0046] Prepare the base film and porous polyester film containing inorganic particles according to the aforementioned method, wherein SiO 2 The content in the whole base film is 40% by weight, and the thickness of the prepared film is 12 μm. The relevant properties of the obtained porous polyester film are shown in Table 1.

Embodiment 2

[0048] Prepare the base film and porous polyester film containing inorganic particles according to the aforementioned method, wherein SiO 2 The content in the entire base film is 60% by weight, and the thickness of the prepared film is 12 μm. The relevant properties of the obtained porous polyester film are shown in Table 1.

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PUM

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Abstract

The invention relates to a lithium ion battery, in particular to a lithium ion battery diaphragm and a preparation method. In order to overcome the defect of complicated manufacturing process or higher production cost of the lithium ion battery diaphragm in the prior art, the invention provides the lithium ion battery diaphragm, and the lithium ion battery diaphragm is characterized by being a multiporous polyester film. Because that the polyester material has excellent mechanical property, the obtained multiporous polyester film has high tensile strength and penetration resistance strength. The invention also provides the preparation method for the lithium ion battery diaphragm, the preparation method employs a bidirectional stretching technology to prepare a polyester basilemma with inorganic filling particles, and then an organic solvent is used for extracting and precipitating the inorganic filling particles in the basal lamina to obtain the multiporous polyester film. The method has the advantages of simple production technology and low production cost, and the multiporous polyester films with different thicknesses can be prepared.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, no memory effect, etc., and have the advantages of safety, reliability, and fast charge and discharge, so they have become a hot spot in the research of new power supply technologies in recent years. The separator is an important part of the lithium-ion battery, and its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and other characteristics of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. [0003] At present, the materials of lithium-ion battery separators mainly include polypropylene (PP), polyethylene (PE) single-layer microporo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/18
CPCY02E60/10
Inventor 不公告发明人
Owner 合肥长阳新材料科技有限公司
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