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Polymer electrolyte and preparation method thereof and solid-state lithium-air battery

An air battery and electrolyte technology, applied in solid electrolytes, non-aqueous electrolytes, electrical components, etc., can solve problems such as inability to apply lithium-air batteries, polyethylene oxide failure, etc., to improve safety and stability, promote dissociation, The effect of excellent conductivity and stability

Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent uses polyethylene oxide as a polymer, which is only suitable for lithium-ion batteries to a certain extent, but not for lithium-air batteries, because the product lithium peroxide in lithium-air batteries will react with polyethylene oxide, resulting in polyoxidation ethylene failure

Method used

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  • Polymer electrolyte and preparation method thereof and solid-state lithium-air battery
  • Polymer electrolyte and preparation method thereof and solid-state lithium-air battery
  • Polymer electrolyte and preparation method thereof and solid-state lithium-air battery

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preparation example Construction

[0032]The invention provides a method for preparing a polymer electrolyte, comprising the steps of:

[0033] S1. Preparation of metal-organic framework materials by solvothermal method;

[0034] S2. Dissolving the lithium salt in the ionic liquid, and heating to remove water, to obtain a lithium-containing ionic liquid; mixing the metal-organic framework material prepared in step S1 with the lithium-containing ionic liquid according to a preset mass ratio, After heating and stirring, a composite filler is obtained;

[0035] S3. Dissolving the polyether polyurethane elastomer in an organic solvent, then adding the composite filler obtained in step S2, and stirring thoroughly to obtain a homogeneous solution; uniformly coating the homogeneous solution on a polytetrafluoroethylene board and dry until the organic solvent is completely volatilized to obtain a polymer electrolyte.

[0036] In step S1, the preparation steps of the metal-organic framework material are as follows:

...

Embodiment 1

[0048] This embodiment provides a method for preparing a polymer electrolyte, comprising the following steps:

[0049] S1. Preparation of metal-organic framework materials by solvothermal method

[0050] At room temperature, ultrasonically dissolve hafnium chloride (1.281 g, 4 mmol) and terephthalic acid (1.32 g, 8 mmol) in 24 mL of N,N-dimethylformamide (DMF), and add 0.665 mL of 12mol / L hydrochloric acid to generate more crystal nuclei, after ultrasonic stirring and dissolving, transfer the mixed solution into a 100mL high-pressure reactor lined with polytetrafluoroethylene. Then put the reaction kettle into a programmed temperature-controlled oven at a temperature of 1°C min -1 The heating rate is from room temperature to 120°C, after 24 hours of reaction, and then at 1°C·min -1 Cool down to room temperature. The product was filtered to obtain a white solid, which was rinsed three times with N,N-dimethylformamide and acetone respectively, activated and dried to obtain a ...

Embodiment 2

[0058] This embodiment provides a solid-state lithium-air battery, which includes a positive electrode, a negative electrode, and the polymer electrolyte prepared in Example 1. Among them, the positive electrode is an air electrode, and the negative electrode is a lithium metal sheet.

[0059] The air electrode is nickel foam loaded with commercial carbon nanotubes, and its preparation method is as follows: mix 90mg commercial carbon nanotubes, 5mg polytetrafluoroethylene emulsion and 10mL N-methylpyrrolidone evenly, and stir with a homogenizer to form slurry, and with a caliber of 0.3mm spray gun, the slurry is sprayed on the nickel foam.

[0060] The electrical performance of the solid-state lithium-air battery provided in this embodiment is tested, and its charge-discharge curve and cycle test chart are respectively as follows image 3 and Figure 4 shown.

[0061] exist image 3 Among them, the curve a represents the change curve of the voltage with the test time, and ...

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Abstract

The invention discloses a polymer electrolyte and a preparation method thereof and a solid-state lithium-air battery. The preparation method comprises the following steps: preparing a metal-organic framework material by adopting a solvothermal method, and mixing the metal-organic framework material with lithium-containing ionic liquid to obtain a composite filler; and taking a polyether polyurethane elastomer as a matrix, and mixing the polyether polyurethane elastomer with the composite filler to obtain the polymer electrolyte. The polymer electrolyte has excellent conductivity and stability,can effectively improve the safety and stability of the solid-state lithium-air battery when being used in the solid-state lithium-air battery, and enables the solid-state lithium-air battery to maintain excellent charge-discharge performance and cycle performance so as to meet the requirements of practical application. By adopting the mode, the composite filler can be loaded on the polyether polyurethane elastomer, and the polymer electrolyte prepared by utilizing the soft segment and the hard segment of the polyether polyurethane elastomer has excellent electrical conductivity and mechanical property, so that the electrical conductivity and the stability of the polymer electrolyte are effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium-air batteries, in particular to a polymer electrolyte, a preparation method thereof and a solid-state lithium-air battery. Background technique [0002] In the past ten years, lithium-ion batteries have been greatly developed, and they have been used in small portable electronic devices to large power systems. However, due to the limited energy density of lithium-ion batteries at present, when they are applied to the power consumption system in electric vehicles, they cannot meet the needs of long-distance driving of electric vehicles. For this reason, lithium-air batteries with higher theoretical energy density have begun to receive attention, but due to the fluidity of organic liquid electrolytes, the electrolyte in lithium-air batteries using organic liquid electrolytes is easy to leak, making lithium-air batteries It will face serious security problems when it is actually used. Therefore, so...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M12/08
CPCH01M10/0565H01M12/08H01M2300/0082Y02E60/10
Inventor 张炜鑫曹元成吴林
Owner HUAZHONG UNIV OF SCI & TECH
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