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Preparation method of polymer electrolyte composite membrane for solid-state battery

A solid-state battery and polymer technology, applied in the field of lithium-ion battery separator, can solve the problems of insufficiency and low lithium-ion conductivity, and achieve the effects of easy batch production, accelerated cation conduction, and short process.

Pending Publication Date: 2020-03-24
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium ion conductivity of polymer electrolyte materials is generally low, which cannot meet the room temperature ionic conductivity of commercial all-solid polymer electrolytes to reach 10. -4 S / cm requirements

Method used

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  • Preparation method of polymer electrolyte composite membrane for solid-state battery
  • Preparation method of polymer electrolyte composite membrane for solid-state battery
  • Preparation method of polymer electrolyte composite membrane for solid-state battery

Examples

Experimental program
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Effect test

preparation example Construction

[0035] 2. Preparation of ZIF-8

[0036] Weigh 2.974g (10.0mmol) of zinc nitrate hexahydrate, dissolve it in 200mL of methanol, and dissolve it completely by ultrasonication for 10 minutes; Dissolve, pour the obtained 2-methylimidazole solution into the zinc nitrate hexahydrate solution and stir for 2 hours at a stirring speed of 500r / min. The above product is centrifuged three times and washed with methanol three times at 8000r / min for 10 minutes. The centrifuged product is dried at 80°C for 24 Hours, ZIF-8 white powder was obtained.

[0037] 3. Preparation of ZIF-67

[0038]Weigh 1.456g of cobalt nitrate hexahydrate and dissolve it into 50mL DMF, and dissolve 3.28g of 2-methylimidazole into 50mL DMF, respectively, and ultrasonically dissolve them. After the dissolution is complete, pour the 2-methylimidazole solution into cobalt nitrate hexahydrate and stir for 6 hours, the stirring speed was 500r / min, the centrifuged product was centrifugally washed with methanol three tim...

Embodiment 1

[0044] A polymer electrolyte composite membrane for a solid-state battery, the specific preparation steps are as follows:

[0045] 1. Preparation of metal-organic framework / fiber composite membrane: Under the condition that the ambient temperature is 20±2°C and the air humidity is 15-25%, take 5mL UIO-66-NH2 / PAN spinning solution (0.6g UIO-66- NH2 and 0.4g PAN (Mv=150000) were completely dissolved in N-N dimethylformamide, stirred for 24 hours) into a 5mL syringe, using a needle with an inner diameter of 0.6mm, the receiver rotation speed was 15mm / min, and the spinning was advanced The speed is 0.15mm / min, the positive pressure of the needle is 9.6kV, the negative pressure of the receiver aluminum foil is 2kV, the distance from the needle to the aluminum foil is 15cm, and the metal organic framework / fiber composite film is made by electrospinning, abbreviated as UIO-66-NH2 spinning film , by adjusting the aperture size of the needle and the distance from the needle to the drum...

Embodiment 2

[0053] A polymer electrolyte composite membrane for a solid-state battery, the specific preparation steps are as follows:

[0054] 1. Preparation of metal-organic framework / fiber composite membrane: under the condition that the ambient temperature is 20±2°C and the air humidity is 15-25%, take 5mL ZIF-8 / PAN spinning solution (0.6g ZIF-8 and 0.4 g PAN (Mv=150000) completely dissolved in N-N dimethylformamide) was injected into a 5mL syringe, using a needle with an inner diameter of 0.6mm, the receiver rotation speed was 15mm / min, and the spinning speed was 0.1mm / min. The positive pressure is 7.2kV, the negative pressure of the receiver aluminum foil is -2kV, the distance from the needle to the aluminum foil is 15cm, and the metal organic framework / fiber composite film is made by electrospinning, abbreviated as UIO-66-NH2 spinning film, with a thickness of 90μm;

[0055] 2. Preparation of PEO / Li(TFSI) composite membrane: Weigh 3.25g of PEO (Mv=1000000), dissolve it in 75g of ace...

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Abstract

The invention discloses a preparation method of a polymer electrolyte composite membrane for a solid-state battery, which comprises the following steps: adding a metal organic framework material and apolymer into an organic solvent, uniformly mixing, and carrying out electrostatic spinning to prepare a polymer / MOF fiber composite membrane; dissolving PEO and Li (TFSI) in acetonitrile, and preparing a PEO / Li (TFSI) composite film through a solution casting method; and respectively putting a PEO / Li (TFSI) composite film, a polymer / MOF fiber composite film and a PEO / Li (TFSI) composite film between the polytetrafluoroethylene films or on the surfaces of the polytetrafluoroethylene films in a sandwich structure, and cooling after hot pressing to obtain the polymer electrolyte composite film for the solid-state battery. According to the method, the good complexing capability of PEO and Li (TFSI) is utilized; the polymer / MOFs fiber composite membrane can provide support sites; an ordered lithium ion conduction channel can be provided by the microporous structure of the MOFs; anions of Li (TFSI) can be fixed in microporous channels, cation transmission is accelerated, and the conductivity and high voltage resistance of the material are improved, so that the conductivity of the material can reach 10 <-4 > S cm <-1 >, and the requirement of commercial all-solid-state polymer electrolyte on the conductivity is met.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery separators, and in particular relates to a preparation method of a polymer electrolyte composite membrane for solid-state batteries. Background technique [0002] Currently, commercial lithium-ion batteries mainly use organic liquid electrolytes. Due to factors such as low boiling point, low flash point, flammability and volatility, organic liquid electrolytes are likely to cause safety problems such as electrolyte leakage, battery combustion, and explosion. In addition, during the cycle of a lithium metal battery using metallic lithium as the negative electrode, lithium dendrites are easily formed on the surface of the lithium metal negative electrode, which can pierce the separator and cause an internal short circuit in the battery, causing battery failure or a series of safety issues. Therefore, the development of safe, efficient, and capable of inhibiting the growth of lithium den...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0082Y02E60/10
Inventor 王正帮李从元郑自建唐密
Owner HUBEI UNIV
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