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Method for preparing lithium battery polymer electrolyte having high conductivity

A high-conductivity, polymer technology, applied in the manufacture of electrolyte batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve problems such as low conductivity and inability to meet the needs of use

Active Publication Date: 2017-06-30
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the new generation of polymer electrolyte films cannot meet the needs of use due to their low conductivity at room temperature.

Method used

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  • Method for preparing lithium battery polymer electrolyte having high conductivity
  • Method for preparing lithium battery polymer electrolyte having high conductivity
  • Method for preparing lithium battery polymer electrolyte having high conductivity

Examples

Experimental program
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specific Embodiment approach 1

[0022] Embodiment 1: A method for preparing a high-conductivity solid polymer electrolyte based on polyvinylidene fluoride (PVDF), which is characterized in that it is carried out according to the following steps:

[0023] Step 1: Put PVDF, polyvinylpyrrolidone (PVP), and ethylenediaminetetraacetic acid (EDTA) in a dry box for processing.

[0024] Step 2: Dissolve 0.5g of PVDF in 3.5mL of N,N-methylformamide (DMF) solvent, stir for 12 hours, weigh 0.85g of EDTA and disperse in 1mL of DMF solvent, stir for 12 hours, mix the two Stirring was continued for another 12 hours.

[0025] Step 3: Weigh 0.01g of PVP and disperse in 1mL DMF solvent for 3 hours, and continue mixing with the solution mixed with PVDF and EDTA.

[0026] Step 4: Add 0.25 g of lithium bistrifluoromethanesulfonimide to the mixture, and continue stirring for 6 hours until the polymer is stable and uniform.

[0027] Step 5: Adhere the scotch tape on a clean glass plate in parallel lines, control the thickness b...

specific Embodiment approach 2

[0032] Specific embodiment 2: This embodiment is a further description of the method of specific embodiment 1 using polyvinylidene fluoride (PVDF) as the matrix solid polymer electrolyte. The second step is: dissolving 0.5g of PVDF in 3.5mL Stir in N,N-methylformamide (DMF) solvent for 12 hours, weigh 0.85 g of EDTA and disperse in 1 mL of DMF solvent, stir for 12 hours, mix the two and then stir for 12 hours.

specific Embodiment approach 3

[0033] Specific embodiment three: This embodiment is a further description of the method of the solid polymer electrolyte based on polyvinylidene fluoride (PVDF) in the specific embodiment one. The third step is: weigh 0.01g of PVP and disperse it in 1mL DMF Solvent for 3 hours, continued mixing with solution mixed with PVDF and EDTA.

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Abstract

The invention relates to a method for preparing a lithium battery polymer electrolyte having high conductivity, which relates to a preparation method for increasing the conductivity of a polymer dielectric film in a lithium ion battery. The problem of low conductivity of the solid polymer dielectric film under normal temperature can be solved, so that the usage requirement cannot be satisfied. The preparation method comprises the following steps: dissolving 0.5 g of PVDF in 3.5 mL of a N, N-methyl methanamide (DMF) solvent, stirring the materials for 12 hours, weighing 0.85 g of EDTA and dispersing the material in 1 mL of the DMF solvent, stirring the materials for 12 hours, mixing the materials and stirring a mixture for 12 hours, weighing 0.01 g of PVP and dispersing the material in 1 mL of the DMF solvent for 3 hours, continuously mixing the material with a solution of PVDF and EDTA, adding 0.25 g of lithium bis(trifluoromethanesulfonyl) imide in the mixture, and continuously stirring the mixture for 6 hours until a polymer is stable and uniform, casting the stirred polymer electrolyte on a clean glass plate , placing the glass plate in a vacuum drying box, heating the material at the temperature of 110 DEG C for 1 hour to obtain a film. The method is used in the field of the lithium battery.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery polymer electrolyte with high conductivity, in particular to a preparation method of polymer blending modification to improve conductivity. Background technique [0002] Lithium-ion batteries were born at the end of the 20th century. Its advantages such as light weight, high capacity density, long life, shock resistance, impact resistance and small size are irreplaceable by other energy storage devices. [0003] The conductivity of electrolytes to ions is mainly driven by concentration gradients, chemical potential gradients, and electric field gradients. For the electrolyte film in the lithium-ion battery, the ion conduction mechanism is mainly through the functional groups on the polymer chain segment, and these functional groups can interact with the lithium salt to dissociate the lithium salt. Generally speaking, the lithium ions in the lithium salt will interact with the anionic g...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0565H01M10/42
CPCH01M10/0565H01M10/058H01M10/4235H01M2300/0082Y02E60/10Y02P70/50
Inventor 李丽波王福日杨雪莹
Owner HARBIN UNIV OF SCI & TECH
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