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Liquid crystalline ionomer PEO/PMMA solid electrolyte and preparation method thereof

A technology of solid electrolytes and ionomers, applied in solid electrolytes, non-aqueous electrolytes, electrolyte immobilization/gelation, etc., can solve problems such as failure to meet requirements, poor low-temperature performance, and low glass transition temperature of PEO

Inactive Publication Date: 2014-06-11
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the research on polymer lithium-ion batteries is progressing rapidly, and there are already batches of finished batteries produced, judging from the research status of polymer lithium-ion batteries at home and abroad, the performance of existing polymer lithium-ion batteries is still not ideal.
Compared with liquid organic electrolyte lithium-ion batteries, the main problems of polymer lithium-ion batteries are as follows: (1) poor high-rate charge and discharge performance
(2) Poor low temperature performance
(3) The production process is constantly improving, and the production line is relatively immature
(4) Inflation may occur during formation, which complicates the packaging process
[0017] Usually, the polymer electrolyte matrix of lithium-ion batteries adopts PEO or PMMA. Due to the low glass transition temperature of PEO, it is unstable at room temperature.
PMMA is relatively stable, but the conductivity at room temperature is low, which cannot meet the requirements

Method used

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  • Liquid crystalline ionomer PEO/PMMA solid electrolyte and preparation method thereof
  • Liquid crystalline ionomer PEO/PMMA solid electrolyte and preparation method thereof
  • Liquid crystalline ionomer PEO/PMMA solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. PEO:PMMA is weighed by mass percentage (30-70), wherein the molecular weight of PEO is 480,000, and the molecular weight of PMMA is 90,000, and it is configured into a 30g / L dichloromethane solution, stirred, and sealed. Place it for one to two days until all the solids are dissolved to form a homogeneous solution.

[0049] 2. Weigh 10% of lithium perchlorate and 0.5% of liquid crystal ionomer, heat and stir with N-methylpyrrolidone at 80°C to dissolve, and prepare lithium perchlorate and liquid crystal ionomer with concentrations of 0.03-0.15g / L respectively And 0.003-0.03g / L solution. Liquid crystal ionomer is a main chain liquid crystal polymer containing sulfonate ions.

[0050] 3. Blend and stir the solution in 2 and the matrix solution at a volume ratio of 1:50 to obtain a gel-like liquid, scrape the film on a glass plate or a tetrafluoroethylene plate or spin the film with a spin coater, and make A homogeneous film with a thickness of 0.1-0.5 mm was obtained...

Embodiment 2

[0053] 1. PEO: PMMA is weighed by mass percentage (30-70), wherein the molecular weight of PEO is 520,000, and the molecular weight of PMMA is 100,000, which is configured into a 30g / L dichloromethane solution, stirred, and sealed. Place it for one to two days until all the solids are dissolved to form a homogeneous solution.

[0054] 2. Weigh 10% of lithium perchlorate and 0.8% of liquid crystal ionomer, heat and stir with N-methylpyrrolidone at 80°C to dissolve, and prepare lithium perchlorate and liquid crystal ionomer with concentrations of 0.03-0.15g / L respectively And 0.003-0.03g / L solution. Liquid crystal ionomer is a main chain liquid crystal polymer containing sulfonate ions.

[0055] 3. Blend and stir the solution in 2 and the matrix solution at a volume ratio of 1:50 to obtain a gel-like liquid, scrape the film on a glass plate or a tetrafluoroethylene plate or spin the film with a spin coater, and make A homogeneous film with a thickness of 0.1-0.5 mm was obtaine...

Embodiment 3

[0058] 1. PEO:PMMA is weighed by mass percentage (50-50), wherein the molecular weight of PEO is 600,000, and the molecular weight of PMMA is 110,000, and it is configured into a 30g / L dichloromethane solution, stirred, and sealed. Place it for one to two days until all the solids are dissolved to form a homogeneous solution.

[0059] 2. Weigh 10% of lithium perchlorate and 1.0% of liquid crystal ionomer, heat and stir with N-methylpyrrolidone at 80°C to dissolve, and prepare lithium perchlorate and liquid crystal ionomer with concentrations of 0.03-0.15g / L respectively And 0.003-0.03g / L solution. Liquid crystal ionomer is a main chain liquid crystal polymer containing sulfonate ions.

[0060] 3. Blend and stir the solution in 2 and the matrix solution at a volume ratio of 1:50 to obtain a gel-like liquid, scrape the film on a glass plate or a tetrafluoroethylene plate or spin the film with a spin coater, and make A homogeneous film with a thickness of 0.1-0.5 mm was obtaine...

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Abstract

The invention relates to a liquid crystalline ionomer PEO / PMMA solid electrolyte and a preparation method thereof, which is characterized in that the liquid crystalline ionomer PEO / PMMA solid electrolyte is composed of PEO, PMMA, lithium salt, the liquid crystalline ionomer and an aprotic solvent; the preparation method comprises the following steps: taking PEO and PMMA as matrix, dissolving PEO and PMMA in a first anhydrous solvent to form a first solution; dissolving lithium salt and the liquid crystalline ionomer in a second anhydrous solvent to form a second solution; blending and uniformly stirring the first solution and the second solution to prepare a mixed solution; knifing the mixed solution to prepare an electrolyte membrane with certain thickness, and evaporating the solvent to form a solid polymer electrolyte. The liquid crystalline ionomer PEO / PMMA solid electrolyte solves the problem that the glass-transition temperature of current PEO is low and is not stable under room temperature, PMMA is stable and can not reach the requirement due to low conductivity at room temperature, the liquid crystalline ionomer is simultaneously added, the ionic transmission is increased, the ion conductivity is increased, and the matrix mechanical property is increased.

Description

technical field [0001] The invention relates to a polymer electrolyte and a preparation method thereof, in particular to a liquid crystal ionomer PEO / PMMA solid electrolyte and a preparation method thereof, which are suitable for electrochemical devices, such as secondary batteries with high energy density. Background technique [0002] Information, energy and environmental protection are the main topics of concern to human society in the 21st century. Green secondary lithium-ion batteries have been widely studied for their high capacity, almost no pollution to the environment and good safety performance, and have been developed rapidly in the past 10 years. Lithium-ion batteries are divided into liquid lithium-ion batteries and solid-state lithium-ion batteries. A prominent problem in the application of liquid lithium-ion batteries is the leakage of electrolyte solutions. The batteries contain flammable components, such as organic electrolyte solutions and lithium carbon, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0525H01M10/0565H01M2300/0082H01M2300/0085Y02E60/10
Inventor 张爱玲那贵洲李三喜吕震乾
Owner SHENYANG POLYTECHNIC UNIV
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