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Dual-lithium-salt compounded PEO-based polymer electrolyte and preparation method therefor

An electrolyte and polymer technology, applied in the field of preparation of polyethylene oxide (hereinafter referred to as PEO)-based polymer electrolyte, can solve the problems of low conductivity, poor interface stability, low battery cycle life, etc., achieve high conductivity, reduce Effect of increasing crystallinity and interfacial stability

Inactive Publication Date: 2017-02-22
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a modification method for the problems of low conductivity, poor interface stability, and low cycle life of the battery in the PEO-based polymer electrolyte. The electrical conductivity is greatly improved, the interface stability is enhanced, and the battery cycle life is improved

Method used

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  • Dual-lithium-salt compounded PEO-based polymer electrolyte and preparation method therefor
  • Dual-lithium-salt compounded PEO-based polymer electrolyte and preparation method therefor
  • Dual-lithium-salt compounded PEO-based polymer electrolyte and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In an argon atmosphere glove box, weigh 0.3g~0.6g of PEO with a molecular weight of 2,000,000~4,000,000, put it into a 20mL mixing bottle, then add 10mL~15mL of acetonitrile, and stir magnetically until the PEO is completely dissolved without obvious solid particles exist, then add 0.08g~0.16g LiTFSI, stir until completely dispersed, add 0.02~0.04g nano-alumina, particle size 20nm~100nm, after the dispersion is complete, then weigh 0.02g LiI powder into it, and then use a magnetic stirring device to mix uniform. After stirring for 48 hours, it becomes a milky white suspension. Pour it into a polytetrafluoroethylene mold and cast it to form a film. Let it dry naturally. After 72 hours, it is completely dry and becomes an opaque film. Carefully tear it off with tweezers and punch it into circles. Tablets are ready for use.

[0030] The scanning electron microscope (SEM) picture of the PEO-based polymer electrolyte film obtained by this embodiment is as follows figure 1 ...

Embodiment 2

[0036] In an argon atmosphere glove box, weigh 0.3g~0.6gPEO, molecular weight 4000000~5000000, put it into a 20mL mixing bottle, then add 10mL~15mL acetonitrile, stir magnetically until the PEO is completely dissolved, no obvious solid particles exist, Then add 0.08g~0.16g LiTFSI, stir until completely dispersed, add 0.02~0.04g nano-alumina, particle size 20nm~30nm, after the dispersion is complete, weigh 0.04g LiI powder into it, and then use a magnetic stirring device to mix evenly. After stirring for 48 hours, it becomes a milky white suspension. Pour it into a polytetrafluoroethylene mold and cast it to form a film. Let it dry naturally. After 72 hours, it is completely dry and becomes an opaque film. Carefully tear it off with tweezers and punch it into circles. Tablets are ready for use.

[0037] The PEO-based polymer electrolyte film obtained in this example was tested in the same way as in Example 1, and the test results were equivalent.

[0038]In the PEO-based polym...

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Abstract

The invention discloses a dual-lithium-salt compounded micron-sized PEO-based polymer electrolyte and a preparation method therefor. The electrolyte comprises the components of PEO, nano-scale oxide, an organic lithium salt and an inorganic lithium salt. The preparation method comprises the steps of dispersing the PEO, the nano-scale oxide and the lithium salts in acetonitrile; and then by performing a film casting method, pouring a mixed liquid into a polytetrafluoroethylene die, and drying naturally to finally prepare the polymer electrolyte thin film with micron-scale thickness. By changing the contents of the Li salts and by regulating and controlling the ratio of Li to EO in the polymer electrolyte, the lithium ion transmission condition in a two-phase interface is improved, the ionic conductivity of the polymer electrolyte is improved, and the interface impedance is lowered, so that the polymer electrolyte is expected to be used in a polymer all-solid-state lithium ion battery in the future.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources in the field of energy utilization, and relates to a preparation process of an electrolyte, in particular to a preparation method of a dilithium salt-composite polyethylene oxide (hereinafter referred to as PEO)-based polymer electrolyte. Background technique [0002] Lithium-ion solid-state electrolytes can be divided into two categories: inorganic and polymer. Among them, the polymer solid-state electrolyte has the characteristics of low density, easy processing, flexible manufacturing shape, and high safety factor, and has broad application prospects in the next generation of high-safety all-solid-state lithium-ion batteries. The currently used polymer matrices include PEO, polymethyl methacrylate (PMMA for short), polyvinyl alcohol (PVA for short), etc. Among them, PEO is the most common application, but the PEO matrix has high crystallinity and low ion conductivity, so it is no...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0082Y02E60/10
Inventor 施斌田文生吴勇民徐碇皓李永汤卫平
Owner SHANGHAI INST OF SPACE POWER SOURCES
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