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Long-branched-chain single-ion polymer electrolyte, and preparation and application thereof

A polymer, long-chain technology, applied in the field of long-chain branched single-ion polymer electrolytes, can solve the problems of low ion migration number and low ion conductivity, achieve controllable structure, improve migration ability, and facilitate migration movement Effect

Active Publication Date: 2019-11-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying the polymer electrolyte to lithium-ion batteries can obtain a polymer electrolyte membrane with excellent electrochemical properties, thereby solving the technical problems of low ion migration number and low ion conductivity of existing polymer electrolytes

Method used

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  • Long-branched-chain single-ion polymer electrolyte, and preparation and application thereof
  • Long-branched-chain single-ion polymer electrolyte, and preparation and application thereof
  • Long-branched-chain single-ion polymer electrolyte, and preparation and application thereof

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preparation example Construction

[0051] In some embodiments, the preparation method includes the following steps:

[0052] (1) Mix tert-butyl acrylate 2-((2-bromopropionyloxy)methyl) with chain transfer reagent, free radical initiator and solvent as shown in formula (two), remove water in the system And oxygen, under inert gas atmosphere, heating reaction, through precipitation, filtration and drying, obtain the poly-2-((2-bromopropionyloxy group) methyl) of bifunctional macromolecule intermediate shown in formula (three) tert-butyl acrylate;

[0053] (2) The macromolecular intermediate poly 2-((2-bromopropionyloxy) meth) tert-butyl acrylate obtained in the step (1) and polyethylene glycol methyl represented by formula (6) Acrylic ester, catalyst, ligand and solvent are mixed uniformly, water and oxygen in the system are removed, and in an inert gas atmosphere, after heating and reacting, precipitation, centrifugation and drying are carried out to obtain long-branched graft copolymerization as shown in formu...

Embodiment 1

[0069] A kind of long-chain branched single-ion polymer electrolyte has the chemical structure of the following formula:

[0070]

[0071] The preparation of the long-chain branched single-ion polymer electrolyte comprises the following steps:

[0072] (1) Synthesis of bifunctional intermediate poly 2-((2-bromopropionyloxy)methyl) tert-butyl acrylate 3a:

[0073]

[0074] 0.44g 2-((2-bromopropionyloxy)methyl) tert-butyl acrylate, 41.8mg 4-cyano-4-(phenylthioformylthio)pentanoic acid and 8.2mg azobis Add isobutyronitrile to 6mL toluene and stir to mix evenly, then cycle through freezing-vacuumizing-argon gas three times to remove water and oxygen, heat to 50°C and react for 12 hours, and the reaction solution is precipitated in n-hexane to obtain long-branched branches Copolymer 3a.

[0075] (2) Synthesis of a long-chain branched monoionic polymer 1a:

[0076]

[0077] Under an argon atmosphere, 20.9 μL of N,N,N',N,'N"-pentamethyldiethylenetriamine, 29.3 mg of macro...

Embodiment 2

[0083] A kind of long-chain branched single-ion polymer electrolyte has the chemical structure of the following formula:

[0084]

[0085] The preparation of the long-chain branched single-ion polymer electrolyte comprises the following steps:

[0086] (1) Synthesis of bifunctional intermediate poly 2-((2-bromopropionyloxy)methyl) tert-butyl acrylate 3a:

[0087]

[0088] 0.44g 2-((2-bromopropionyloxy)methyl) tert-butyl acrylate, 41.8mg 4-cyano-4-(phenylthioformylthio)pentanoic acid and 8.2mg azobis Add isobutyronitrile to 6mL toluene and stir to mix evenly, then cycle through freezing-vacuumizing-argon gas three times to remove water and oxygen, heat to 50°C and react for 12 hours, and the reaction solution is precipitated in n-hexane to obtain long-branched branches Copolymer 3a.

[0089] (2) Synthesis of a long-chain branched monoionic polymer 1b:

[0090]

[0091] Under a nitrogen atmosphere, 20.9 μL N,N,N',N,'N"-pentamethyldiethylenetriamine, 29.3 mg of macrom...

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Abstract

The invention belongs to the field of polymer electrolytes of lithium ion batteries, and particularly relates to a long-branched-chain single-ion polymer electrolyte, and preparation and application thereof. A main chain of the polymer electrolyte is a polyacrylate chain; a long branched chain is grafted on the main chain of a polymer; each carbon atom grafted with the long branched chain on the main chain is connected with a lithium carboxylate group; and the polymer electrolyte has a structure as shown in a formula (1), wherein n is an integer from 10 to 50, r is an integer from 10 to 30, and m is an integer from 4 to 20. By designing key structures such as the chemical structure, the main chain, the side chain length and the like of the polymer, and optimizing process parameters of corresponding preparation processes, the polymer electrolyte with the specific structure is obtained. Compared with the prior art, the technical scheme can better solve the problem that the lithium ion migration number of the polyoxyethylene-based polymer electrolyte is excessively low.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery polymer electrolytes, and more specifically relates to a long-chain branched single-ion polymer electrolyte, its preparation and application. Background technique [0002] High pollution and unstable fossil fuel resources make human beings face the great challenges of environmental pollution and climate change. People urgently need new energy storage and conversion technologies to reduce dependence on traditional, non-renewable resources. Among them, lithium-ion batteries are especially favored by people because of their high energy density and high output power. However, traditional commercial lithium-ion batteries mostly use liquid electrolyte systems, and liquid organic solvents are easy to leak during use, causing danger. Therefore, people are turning their attention to safer and more stable solid-state polymer electrolytes. [0003] According to the different substrates used, solid polymer...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 薛志刚李少桥周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH