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Nanoparticle modified cross-linked polymer, polymer electrolyte, preparation method and application thereof

A technology of cross-linked polymers and nanoparticles, which is applied in the field of lithium-ion batteries, can solve the problems of low ion conductivity and complicated operation, and achieve the effects of high ion conductivity, suitable flexibility, and simple preparation process

Active Publication Date: 2019-01-15
BYD CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still has defects such as low ionic conductivity and complex operation.

Method used

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  • Nanoparticle modified cross-linked polymer, polymer electrolyte, preparation method and application thereof
  • Nanoparticle modified cross-linked polymer, polymer electrolyte, preparation method and application thereof
  • Nanoparticle modified cross-linked polymer, polymer electrolyte, preparation method and application thereof

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preparation example Construction

[0046] A third aspect of the present invention is a method for preparing a polymer electrolyte, the method comprising:

[0047] (1) providing a polymerization solution containing crosslinkable copolymers, lithium salts, crosslinking agents, silane coupling agent-modified inorganic nanoparticles and photoinitiators;

[0048] (2) The polymerization solution is cast and molded to obtain a semi-dry film;

[0049] (3) under ultraviolet light irradiation, the semi-dry film is cross-linked and cured;

[0050] Wherein, the crosslinkable copolymer contains the structural unit shown in formula (1), the structural unit shown in formula (2) and the structural unit shown in formula (3);

[0051] Formula 1): Formula (2): Formula (3):

[0052] 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;

[0053] The crosslinking agent is one or more of the acrylate crosslinking agents containing at least two acrylate groups, an...

preparation example 1

[0081] This preparation example is used to illustrate the inorganic nanoparticles modified by silane coupling agent.

[0082] Nano-SiO with a mass ratio of 1:2 2 (purchased from Beijing Deke Daojin Technology Co., Ltd., as particles with a particle size of 30nm) and 3-acryloyloxypropyltrimethoxysilane were added to ethanol (ethanol and nano-SiO 2 The mass ratio is 5:1), followed by ultrasonic dispersion for 30 minutes, and reacting at 100° C. for 12 hours to obtain inorganic nanoparticles modified by silane coupling agent C1.

preparation example 2

[0084] 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-SiO 2 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 nanoparticle modified cross-linked polymer, a polymer electrolyte, a preparation method and application thereof. The cross-linked polymer comprises a cross-linked structure provided by a cross-linking agent and a copolymer chain connected to the cross-linked structure. The copolymer chain is provided by a cross-linkable copolymer containing a structural unit shown as formula (1), a structural unit shown as formula (2) and a structural unit shown as formula (3), wherein the cross-linkable copolymer is connected to the cross-linking agent by at least part of the structural unit shown as formula (3) so as to provide the copolymer chain. The cross-linked polymer also includes a nanoparticle coupling structure provided by silane coupling agent modified inorganic nanoparticles. The polymer electrolyte provided by the invention has high ionic conductivity, low crystallinity and appropriate flexibility. The formula(1), formula (2) and formula (3) are shown as the specification.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to nanoparticle-modified cross-linked polymers and polymer electrolytes, their preparation methods and applications. 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 pres...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/08C08F222/14H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565C08F283/065H01M2300/0082C08F222/104C08F222/102C08F230/08Y02E60/10
Inventor 李元姣刘荣华高磊单军
Owner BYD CO LTD
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