Method for polyurethane-based composite electrolyte membrane and polyurethane-based composite electrolyte membrane

A composite electrolyte membrane and polyurethane technology, which is applied in composite electrolytes, circuits, electrical components, etc., can solve the problems that the film cannot meet the mechanical strength requirements of the separator, the ability to dissolve lithium salts and complex lithium ions is weak, and it cannot be efficiently mass-produced. Achieve the effect of increasing the amorphous area, facilitating migration, and good dimensional stability

Active Publication Date: 2022-07-29
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polarity of the Si-O bond is low, the ability to dissolve lithium salts and complex lithium ions is weak, and the mechanical properties are poor. It is difficult to make a thin film and the thin film is difficult to meet the mechanical strength requirements of the lithium battery assembly process for the separator. , cannot be mass-produced efficiently

Method used

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  • Method for polyurethane-based composite electrolyte membrane and polyurethane-based composite electrolyte membrane
  • Method for polyurethane-based composite electrolyte membrane and polyurethane-based composite electrolyte membrane
  • Method for polyurethane-based composite electrolyte membrane and polyurethane-based composite electrolyte membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 3: Mix the PU-PDMS copolymer prepared in the above step 2 with the lithium salt LiTFSI in a mass ratio of 30% (LiTFSI accounts for 30% of the mass of the PU-PDMS copolymer), and then add it to a twin-screw extruder. The machine heating temperature is 170°C, the melt-blown die spinneret diameter is 0.4mm, the mold temperature is 170°C, the hot air temperature is 200°C, the air pressure is 0.3MPa, and the flow rate is 4.5ml / min. The reinforcing fiber material is PP, the PP melt-blown die spinneret diameter is 0.4mm, the die temperature is 250°C, the hot air temperature is 280°C, the air pressure is 0.3MPa, and the PP melt flow rate is 2ml / min. The fiber filaments ejected from the two dies are uniformly mixed in the air and then settled on the receiving device. The distance between the spinneret holes of the die and the fiber receiving device is 25cm, the speed of the receiving device is 80-120m / min, and the fiber diameters are all at 1-5 μm.

[0039] Step 4: Pass th...

Embodiment 2

[0042] Step 3: The PU-PDMS copolymer prepared in the above step 2 and the lithium salt LiTFSI with a mass ratio of 30% are mixed uniformly and then added to a twin-screw extruder. mm, the mold temperature is 170°C, the hot air temperature is 200°C, the air pressure is 0.3MPa, and the polymer flow rate is 4.5ml / min. The PP melt-blown die has a spinneret diameter of 0.4 mm, a die temperature of 250 °C, a hot air temperature of 280 °C, an air pressure of 0.3 MPa, and a PP melt flow rate of 2 ml / min. The fiber filaments ejected from the two dies are uniformly mixed in the air and settle on the receiving device. The distance between the spinneret holes of the die and the fiber receiving device is 25cm, the speed of the receiving device is 40-80m / min, and the fiber diameter is 1-5μm.

[0043] Step 4: Pass the above mixed fiber filaments through a pressure roller at 50-150°C, adjust the pressure and temperature of the pressure roller to melt and bond the polyurethane-polysiloxane-ba...

Embodiment 3

[0045] Step 3: Mix the PU-PDMS copolymer prepared in step 2 with lithium salt LiTFSI with a mass ratio of 30% uniformly and then add it to a twin-screw extruder. The heating temperature of the extruder is 150° C. , the mold temperature is 150°C, the hot air temperature is 200°C, the air pressure is 0.3MPa, and the polymer flow rate is 4.5ml / min. The reinforcing fiber material is PP, the PP melt-blown die spinneret diameter is 0.4mm, the die temperature is 250°C, the hot air temperature is 280°C, the air pressure is 0.3MPa, and the PP melt flow rate is 2ml / min. The fiber filaments ejected from the two dies are uniformly mixed in the air and settled on the receiving device. The distance between the spinneret holes of the die and the fiber receiving device is 25cm, the speed of the receiving device is 80-120m / min, and the fiber diameter is 1-6μm.

[0046] Step 4: Pass the above mixed fiber filaments through a pressure roller at 50-150°C, adjust the pressure and temperature of th...

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Abstract

The invention provides a preparation method of a polyurethane-based composite electrolyte membrane and a polyurethane-based composite electrolyte membrane. The preparation method of the polyurethane-based composite electrolyte membrane includes a mixing and dispersing step, a melt-blowing step and a hot roller pressing step. Mixing and dispersing step: mixing and dispersing the polyurethane-polysiloxane block copolymer and lithium salt and heating to obtain a lithium salt mixture; melt blowing step: using a melt blowing process to mix and interweave the lithium salt mixture and the reinforcing fibers at the same time, and then settle The composite fiber non-woven fabric is formed on the receiving device; the hot roller pressing step: the composite fiber non-woven fabric is heated and pressed to obtain a polyurethane-based composite electrolyte membrane.

Description

technical field [0001] The invention relates to the field of lithium ion battery technology, in particular to a preparation method of a polyurethane-based composite electrolyte membrane and a polyurethane-based composite electrolyte membrane. Background technique [0002] Commercial lithium-ion batteries have great safety hazards due to the use of volatile, flammable, and leaky organic liquid electrolytes. All-solid-state lithium-ion batteries replace organic liquid electrolytes and porous separators with solid electrolytes with a certain mechanical strength, which can avoid the safety problems caused by liquid electrolytes, and also have the advantages of high energy density and simple processing and molding. [0003] Among them, solid polymer electrolytes are expected to achieve commercial applications due to their good flexibility, interfacial compatibility, and suitability for large-area processing. Polyethylene oxide (PEO) has been widely studied in polymer electrolyte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0088Y02E60/10
Inventor 张焱陈建刘桃松陈冬屠芳芳党志敏张文李敏胡雨萌
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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