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Polymer electrolyte membrane, preparation method thereof and lithium ion battery

An electrolyte membrane and polymer technology, which is applied in the field of lithium-ion batteries, can solve the problems of easy aggregation, poor dispersion, and the impact on the electrical and safety performance of all-solid polymer electrolytes, and achieve appropriate flexibility, low crystallinity, and low cost. Effect

Active Publication Date: 2019-08-13
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dispersion of inorganic particles in polycarbonate polymers is poor, and they are easy to agglomerate, which affects the electrical properties and safety performance of the entire all-solid polymer electrolyte.

Method used

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  • Polymer electrolyte membrane, preparation method thereof and lithium ion battery
  • Polymer electrolyte membrane, preparation method thereof and lithium ion battery
  • Polymer electrolyte membrane, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0055] A second aspect of the present invention provides a method for preparing a polymer electrolyte membrane, the method comprising:

[0056] (1) provide electrolyte slurry containing polymer fiber modified by the first silane coupling agent, crosslinkable copolymer, lithium salt, crosslinking agent, inorganic nanoparticles and photoinitiator; the first silane coupling The agent is a silane coupling agent containing a carbon-carbon unsaturated double bond;

[0057] (2) Casting the electrolyte slurry to obtain a semi-dry film, and then curing and crosslinking under ultraviolet light irradiation to form a polymer electrolyte membrane;

[0058] Wherein, the crosslinkable copolymer contains a structural unit represented by formula (1), a structural unit represented by formula (2) and an optional structural unit represented by formula (3),

[0059]

[0060] Wherein, R is H or C1-C4 alkyl, L is C0-C4 alkylene or -R 1 -O-R 2 -, R 1 C0-C4 alkylene, R 2 is C0-C4 alkylene;

...

preparation example 1

[0089] This preparation example is used to illustrate the inorganic nanoparticles modified by silane coupling agent.

[0090] TiO with a mass ratio of 1:2 2 Nanorods (diameter 150 nm, length 1 μm) and vinyltrimethoxysilane were added to ethanol (ethanol and TiO 2 The nanorods were used at a mass ratio of 5:1), then ultrasonically dispersed for 30 minutes, and reacted at 100° C. for 12 hours to obtain inorganic nanoparticles C1 modified by the silane coupling agent.

preparation example 2

[0092] This preparation example is used to illustrate the inorganic nanoparticles modified by silane coupling agent.

[0093] Nano Al 2 o 3 (purchased from Sumitomo Corporation, Japan, as particles with a particle size of 300nm) in hydrochloric acid (concentration is 0.1mol / L) to carry out surface treatment to make nano-Al 2 o 3 With hydroxyl groups on it, and then the surface-treated nano-Al according to the mass ratio of 1:3 2 o 3 with 3-methacryloxypropylethyldiethoxysilane added to isopropanol (isopropanol and nano-Al 2 o 3 The mass ratio is 4:1), followed by ultrasonic dispersion for 35 minutes, and reacted at 110° C. for 10 hours, so as to obtain the inorganic nanoparticles C2 modified by the silane coupling agent.

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a polymer electrolyte membrane, a preparation method thereof and a lithium ion battery. The polymer electrolyte membrane contains a polymer matrix, lithium salt dispersed in the polymer matrix and polymer fibers, wherein the polymer fibers are provided by polymer fibers modified by a first silane coupling agent, and thefirst silane coupling agent is a silane coupling agent containing carbon-carbon unsaturated double bonds. The polymer matrix contains a cross-linked structure provided by a cross-linking agent, a copolymer chain structure provided by a cross-linkable copolymer, and inorganic nanoparticles. The polymer electrolyte membrane provided by the invention has the advantages of higher ionic conductivity, lower degree of crystallinity, proper flexibility, simple preparation method and process and lower cost.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a polymer electrolyte membrane, a preparation method thereof and a lithium ion battery. Background technique [0002] At present, most lithium-ion batteries on the market use liquid electrolyte as the conductive substance, but during use, the liquid electrolyte is volatile, flammable and explosive, causing many safety problems; moreover, it is easy to grow lithium dendrites, which limits the Application of lithium as negative electrode in batteries. Therefore, solid polymer electrolytes (SPEs) have been proposed to replace liquid electrolytes. The solid polymer electrolyte membrane not only plays the role of ion conduction, but also prevents the contact of positive and negative electrodes. And because of its strong plasticity, it can be made into films of different shapes according to different needs. It has good flexibility, can withstand the pressure of electrodes during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 刘荣华高磊单军
Owner BYD CO LTD
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