Preparation method for all-solid-state polymer electrolyte membrane with three-layer structure

An all-solid polymer, electrolyte membrane technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems to be advanced, and achieve the effects of excellent mechanism and mechanical properties, simple process, and excellent mechanical properties

Active Publication Date: 2016-05-04
UNIV OF SCI & TECH BEIJING
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  • Application Information

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Problems solved by technology

At present, the research at home and abroad is mainly to describe the phenomenon. Due to the disconnection between laboratory research a

Method used

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  • Preparation method for all-solid-state polymer electrolyte membrane with three-layer structure
  • Preparation method for all-solid-state polymer electrolyte membrane with three-layer structure
  • Preparation method for all-solid-state polymer electrolyte membrane with three-layer structure

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preparation example Construction

[0029] The present invention a kind of electrospinning preparation method of the all-solid-state polymer electrolyte membrane of the lithium ion battery of three-layer structure, comprises the following steps:

[0030] Step 1. Choose PEO and PVDF as substrates, and use LiClO as the lithium salt 4 , the nanoparticles are TiO 2 Nanoparticles;

[0031] Step two, PEO and LiClO 4 According to the amount of substance ratio is n EO :n LiClO4 =8:1 dissolved in acetonitrile solvent, magnetically stirred for 1h, then added TiO 2 Nanoparticles were dispersed by ultrasonic vibration for 1h, making TiO 2 The nanoparticles are uniformly dispersed, followed by magnetic stirring for 12 hours to obtain a uniformly dispersed emulsion;

[0032] Step three, dissolve PVDF in V DMAc :V 丙酮 =7:3 mixed solution, magnetically stirred for 1h, and then added TiO 2 Nanoparticles were dispersed by ultrasonic vibration for 1h, making TiO 2 The nanoparticles are uniformly dispersed, followed by mag...

Embodiment 1

[0037] (1) Two substrates, PEO and PVDF, are selected, and LiClO is selected as the lithium salt 4 , the nanoparticles are TiO 2 Nanoparticles (particle size 5-10nm).

[0038] (2) Combine PEO with LiClO 4 Dissolve in acetonitrile solvent according to a certain amount of substances, stir magnetically, and then add a certain amount of TiO2 Nanoparticles, ultrasonic dispersion, magnetic stirring, to obtain a well-dispersed emulsion.

[0039] (3) Dissolve a certain amount of PVDF in V DMAc :V 丙酮 =7:3 mixed solution, magnetic stirring, and then add a certain amount of TiO 2 Nanoparticles, ultrasonic dispersion, magnetic stirring, to obtain a well-dispersed emulsion.

[0040] (4) The spinning solutions prepared in (2) and (3) were prepared by electrospinning layer by layer. By adjusting the volumes of the two spinning solutions, the thickness ratio of the outer layer to the inner layer was controlled to be 5:1. Finally, the obtained three-layer polymer electrolyte membrane was...

Embodiment 2

[0048] (1) Two substrates, PEO and PVDF, are selected, and LiClO is selected as the lithium salt 4 , the nanoparticles are TiO 2 Nanoparticles (particle size 5-10nm).

[0049] (2) Combine PEO with LiClO 4 Dissolve in acetonitrile solvent according to a certain amount of substances, stir magnetically, and then add a certain amount of TiO 2 Nanoparticles, ultrasonic dispersion, magnetic stirring, to obtain a well-dispersed emulsion.

[0050] (3) Combine PVDF with LiClO 4 Soluble in V according to a certain ratio of substances DMAc :V 丙酮 =7:3 mixed solution, magnetic stirring, and then add a certain amount of TiO 2 Nanoparticles, ultrasonic dispersion, magnetic stirring, to obtain a well-dispersed emulsion.

[0051] (4) The spinning solutions prepared in (2) and (3) were prepared by electrospinning layer by layer. By adjusting the volumes of the two spinning solutions, the thickness ratio of the outer layer to the inner layer was controlled to be 3:1. Finally, the obtaine...

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Abstract

The invention relates to the technical field of solid-state polymer electrolyte preparation, and provides a preparation method for a lithium ion battery all-solid-state polymer electrolyte membrane with a three-layer structure through electrostatic spinning. An upper layer and a lower layer adopt PEO with high ionic conductivity as the carrier of lithium salt; a middle layer adopts PVDF with high mechanical strength as the carrier and a transport channel for the lithium salt; meanwhile, the upper layer, the lower layer and the middle layer all adopt TiO2 nanoparticles for modification; and finally layer-by-layer electrostatic spinning is performed by an electrostatic spinning machine for completing the preparation. The preparation method has the beneficial effects that the ionic conductivity and the mechanical strength of the solid-state polymer electrolyte membrane with the three-layer structure prepared by the method are greatly improved compared with the ionic conductivity and the mechanical strength of the corresponding single-layer solid-state polymer electrolyte membrane; and the mechanical strength of the modified solid-state polymer electrolyte membrane with the three-layer structure, added with 3wt% of TiO2 nanoparticles, is improved by 50% compared with the mechanical strength of the corresponding single-layer solid-state polymer electrolyte membrane.

Description

technical field [0001] The invention relates to the technical field of preparation of solid polymer electrolytes, in particular to an electrospinning preparation method of an all-solid polymer electrolyte for lithium-ion batteries with a three-layer structure. Background technique [0002] As an important energy storage element, lithium-ion batteries have a wide range of applications in consumer electronics, electric vehicles, and renewable energy storage. Traditional liquid electrolyte lithium-ion batteries are limited by many defects such as low energy density and poor safety. The use of solid electrolytes instead of liquid electrolytes to prepare new solid-state lithium-ion batteries is currently attracting attention. Polyethylene oxide (PEO)-based solid polymer electrolyte has certain electrical conductivity and the characteristics of high molecular polymers, which provides a new solution for the development of lithium-ion batteries in the direction of all-solid-state, u...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 查俊伟黄娜党智敏
Owner UNIV OF SCI & TECH BEIJING
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