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Polymer-based composite solid electrolyte film and preparation method thereof

A technology of solid electrolytes and polymers, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems such as low room temperature ionic conductivity, short-circuiting of positive and negative electrodes, shorten transmission path, control thickness, and improve mechanical properties Effect

Active Publication Date: 2020-07-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of polymer solid-state electrolyte has low contact resistance with electrodes, and its thermodynamic properties are good, but their room temperature ionic conductivity is low, and their mechanical properties need to be improved to suppress the problem of lithium dendrites and prevent the battery from Electrolyte membrane rupture caused by collision during use, short circuit between positive and negative poles

Method used

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  • Polymer-based composite solid electrolyte film and preparation method thereof
  • Polymer-based composite solid electrolyte film and preparation method thereof
  • Polymer-based composite solid electrolyte film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh and take 1.045g of lithium nitrate, 5.47g of lanthanum nitrate hexahydrate dissolved in 5mlDMF, 2ml of acetic acid, and stir to a uniform and stable state, then add 10.419g tetrabutyl titanate and continue stirring to a uniform and stable state to obtain the LLTO stock solution, then Take out 3ml of the above prepared stock solution, add 0.5g Fe 3 o 4 Nanoparticles were pulverized in 3mlDMF with 300W power for 8h, then added 3mlLLTO stock solution taken out in the previous step, stirred for 30min evenly, added 0.5gPVP and stirred for 3h to form a stable sol, transferred the sol to a syringe for electrospinning, the electrospinning was performed at 1kV It is carried out under an electric field of / cm, and the sol is changed every 30min, and the morphology of the electrospun fiber is obtained by means of drum collection, as shown in the scanning electron microscope figure 1 , it can be seen that the diameter of the fiber before calcination is about 1 μm, and the Fe...

Embodiment 3

[0037] Take 0.05 g of the magnetic composite fiber in Example 1 and place it in 50 ml of ethanol, sonicate for 2 minutes at a power of 40 W, then centrifuge and dry to obtain a short magnetic composite fiber with a size of 1 μm-20 μm, measure 3 ml of DMF solvent, and add 0.014 g , composite fiber, 40W ultrasonic 2min, then add to the sol dissolved in PVDF and LiTFSI uniformly stirred in advance, stir for 5h to a uniform and stable state, then cast the mixture, dry at 80°C for 24h, part of the normal dry, the other A part is dried while introducing a parallel magnetic field with suitable magnetic field strength along the upper and lower sides of the electrolyte film to obtain a composite solid electrolyte film with a volume fraction of 0.5 vol% fibers randomly distributed and oriented and fibers present vertically oriented alignment. Such as image 3 middle b 0 , b 1 It can be seen that the fiber fillers in the composite electrolyte film oriented by the magnetic field obviou...

Embodiment 4

[0039] Take 0.05 g of the composite fiber in Example 1 and place it in 50 ml of ethanol, sonicate for 2 minutes at a power of 40 W, then centrifuge and dry to obtain a short magnetic composite fiber with a size of 1 μm-20 μm, measure 3 ml of DMF solvent, and add 0.028 g of Composite fiber, 40W ultrasonic for 2min, then added to the sol dissolved in PVDF and LiTFSI that was stirred evenly in advance, stirred for 5h to a uniform and stable state, then cast the mixture, dried at 80°C for 24h, part of it was normally dried, and the other part was in While drying, introducing a parallel magnetic field along the upper and lower sides of the electrolyte film with a suitable magnetic field strength can obtain a composite solid electrolyte film with a volume fraction of 1 vol% fibers randomly distributed and oriented and fibers showing vertical orientation. Such as image 3 middle c 0 、c 1 It can be seen that the fiber fillers in the composite electrolyte film oriented by the magneti...

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Abstract

The invention relates to a polymer-based composite solid electrolyte film adopting magnetic composite fibers as filler and a preparation method of the polymer-based composite solid electrolyte film. The polymer-based composite solid electrolyte film comprises the magnetic composite fibers and a polymer matrix in which lithium salt is dissolved, the volume ratio of the magnetic composite fibers is0.5%-2%, the volume ratio of the polymer is 99.5%-98%, and the magnetic composite fibers are arranged in the polymer matrix in a vertical orientation mode. The preparation method comprises the following steps: 1) preparing precursor sol into magnetic composite fibers by an electrostatic spinning method and a calcining process; and 2) compounding the polymer matrix in which the lithium salt is dissolved and the magnetic composite fibers again to form a film, and introducing a magnetic field to carry out orientation regulation and control. According to the process, the distribution and orientation of the filler in the composite film can be controlled, so that the mechanical and electrical properties of the composite film can be improved by regulating and controlling the distribution structure of the filler, and finally, the room-temperature ionic conductivity of the solid electrolyte film is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of solid electrolyte materials, and in particular relates to a polymer-based composite solid electrolyte film using magnetic composite fibers as a filler and a preparation method thereof. Background technique [0002] As an important electrochemical energy storage device, lithium batteries are widely used in portable electronic devices such as mobile phones and notebook computers due to their high energy density, low self-discharge effect, and fast charge and discharge characteristics. Vehicles occupy a large share, and many famous car brands are scrambling to research lithium-ion battery-based power vehicles with higher energy density and higher safety performance. In the field of energy storage device materials, with the rapid development of electronic equipment in recent years, widely used energy storage devices are developing in the direction of high energy storage, miniaturization and env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 张鑫汪思威吴睿鑫
Owner WUHAN UNIV OF TECH
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