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Preparation method of inorganically filled lithium ion battery diaphragm

A lithium-ion battery, inorganic filling technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of easy agglomeration of inorganic ions, inability to increase the heat resistance temperature, poor compatibility of matrix resin, etc., to improve mechanical properties. and heat resistance, ensuring uniformity, and the effect of high porosity

Active Publication Date: 2013-07-10
SHANGHAI SHUANGAO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the above-mentioned prior art, the present invention provides a preparation method of a lithium-ion battery separator with inorganic filling, which solves the problem in the prior art that the inorganic ions are easily agglomerated after being added, and have poor compatibility with the matrix resin, which cannot meet the requirements of membrane pull. The technical problem of improving the heat-resistant temperature under the condition of elongation and puncture performance

Method used

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  • Preparation method of inorganically filled lithium ion battery diaphragm
  • Preparation method of inorganically filled lithium ion battery diaphragm

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preparation example Construction

[0022] The present invention has the preparation method of the lithium-ion battery separator of inorganic filling and comprises the following steps:

[0023] Step 1: Mix and stir the ultra-high molecular weight polyethylene resin and diluent in a high-speed disperser at a mass ratio of 1:4-9 for at least 1 hour to ensure that the polyethylene particles are evenly dispersed in the suspension;

[0024] Step 2: Add tetrabutyl titanate to the ultra-high molecular weight polyethylene resin at a mass ratio of 0.1 to 1.2:1, add tetrabutyl titanate to the solution prepared in step 1, and continue stirring at high speed for 0.5 h;

[0025] Step 3: Stretching and extraction washing after extrusion into film,

[0026] Transfer the solution obtained in step 2 to the twin-screw extruder through a pump, and set the heating temperature of the twin-screw extruder in zones 1-2, 3-6, 7-8, and 9 to 215°C and 225°C respectively , 220°C, 210°C, extruded into film, and cooled by three rolls;

[0...

Embodiment 1

[0037]Add 15 parts by weight of ultra-high molecular weight polyethylene (viscosity average molecular weight 2,500,000), 0.5 parts by weight of 168 antioxidant, 0.5 parts by weight of 1010 antioxidant, and 80 parts by weight of white oil into a high-speed disperser, and mix at 800rpm at room temperature 1 hour. Then add 5 parts of tetrabutyl titanate, adjust the rotational speed of the disperser to 1200 rpm, mix for 0.5 hours and then add the material into the twin-screw extruder. The temperature of each zone of the extruder is set at 215°C, 225°C, 220°C, and 210°C. The extruded film is stretched 6×6 and sent to the circulating water tank. Then the film was heat-treated at 125°C for 5 minutes, and sent to a 25 μm, 130°C thermal calendering process, and the film after two calendering was wound up.

Embodiment 2

[0039] Add 15 parts by weight of ultra-high molecular weight polyethylene (viscosity average molecular weight 2,500,000), 0.5 parts by weight of 168 antioxidant, 0.5 parts by weight of 1010 antioxidant, and 75 parts by weight of white oil into a high-speed disperser, and mix at 800rpm at room temperature 1 hour. Then add 10 parts of tetrabutyl titanate, adjust the rotation speed of the disperser to 1200 rpm, mix for 0.5 hours, and then add the material into the twin-screw extruder. The temperature of each zone of the extruder is set at 215°C, 225°C, 220°C, and 210°C. The extruded film is stretched 6×6 and sent to the circulating water tank. Then the film was heat-treated at 125°C for 5 minutes, and sent to a 25 μm, 130°C thermal calendering process, and the calendered film was wound up.

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Abstract

The invention discloses a preparation method of an inorganically filled lithium ion battery diaphragm. The preparation method comprises the following steps of adding tetrabutyl titanate into suspension liquid prepared from ultrahigh molecular weight polyethylene and a diluent, extruding the mixture to form a diaphragm, stretching the diaphragm, and extracting the diluent; and then carrying out spontaneous reaction on the tetrabutyl titanate in the diaphragm and water in a circulating water tank to generate titanium dioxide, enabling the titanium dioxide to enter a heat treatment device to be shaped, and finally enabling the thickness of the diaphragm to be uniform through thermal rolling. The preparation method can introduce titanium dioxide particles into the diaphragm by utilizing the reaction of the tetrabutyl titanate and the water, and is favorable for enhancing multiple mechanical properties and heat resistance performance of the diaphragm. The preparation method has the advantages of simplicity in operation, energy conservation, environmental protection, high safety and high production efficiency. The porosity of the diaphragm prepared by the preparation method is high, and the intensity of the diaphragm is qualified, and the shrinkage ratio of the diaphragm is smaller than 8% after the diaphragm shrinks at 150 DEG C for one hour. The lithium ion battery diaphragm obtained by the preparation method is good in the heat resistance performance and standard in mechanical properties, and can be used as a large-power lithium-ion battery diaphragm.

Description

technical field [0001] The invention relates to a preparation process of a lithium ion battery material, in particular to a modification method of an ultra-high molecular weight polyethylene film. Background technique [0002] Microporous polyethylene membranes have been widely used as battery separators, separation filters, and microfiltration membranes because of their chemical stability and excellent physical properties. In particular, secondary battery separators require the highest level of quality in addition to battery safety. Recently, as the capacity and output of secondary batteries are improved, requirements for thermal stability of separators have become more stringent. In particular, poor thermal stability of separators in lithium-ion secondary batteries may lead to damage or deformation of the separator due to overheating of the battery, which may cause electrode short circuit and fire. The thermal stability of the battery largely depends on the high-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 范海平赵海玉石品品钱双
Owner SHANGHAI SHUANGAO ENERGY TECH
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