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A long-chain branched single-ion polymer electrolyte, its preparation and application

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

Active Publication Date: 2020-10-02
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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  • A long-chain branched single-ion polymer electrolyte, its preparation and application
  • A long-chain branched single-ion polymer electrolyte, its preparation and application
  • A long-chain branched single-ion polymer electrolyte, its preparation and application

Examples

Experimental program
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preparation example Construction

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

[0052] (1) Mix the tert-butyl 2-((2-bromopropionyloxy)meth)acrylate as shown in formula (2) with chain transfer reagent, free radical initiator and solvent uniformly to remove water in the system With oxygen, under inert gas atmosphere, heating reaction, precipitation, filtration and drying, to obtain bifunctional macromolecular intermediate poly-2-((2-bromopropionyloxy)methyl) as shown in formula (3) Tert-butyl acrylate;

[0053] (2) The macromolecular intermediate poly-2-((2-bromopropionyloxy)meth)acrylate obtained in the step (1) is combined with polyethylene glycol methyl represented by formula (6). Acrylate, catalyst, ligand and solvent are mixed uniformly, and the water and oxygen in the system are removed. Under an inert gas atmosphere, the long-branched chain-branched copolymerization shown in formula (4) is obtained after precipitation, centrifugation and drying after heating reaction Thin...

Embodiment 1

[0069] A single-ion polymer electrolyte with long chain branches, with a chemical structure of the following formula:

[0070]

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

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

[0073]

[0074] 0.44g 2-((2-bromopropionyloxy)meth)acrylate tert-butyl, 41.8mg 4-cyano-4-(phenylthioformylthio)pentanoic acid and 8.2mg azobis Isobutyronitrile was added to 6mL of toluene and stirred and mixed uniformly, then the water and oxygen were removed by the cycle of freezing-evacuating-argon gas three times, heating to 50℃ for 12 hours, the reaction solution was precipitated in n-hexane to obtain long-branched branches Copolymer 3a.

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

[0076]

[0077] In an argon atmosphere, mix 20.9μL N,N,N',N,'N”-pentamethyldiethylenetriamine, 29.3mg macromolecular intermediate...

Embodiment 2

[0083] A single-ion polymer electrolyte with long chain branches, with a chemical structure of the following formula:

[0084]

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

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

[0087]

[0088] 0.44g 2-((2-bromopropionyloxy)meth)acrylate tert-butyl, 41.8mg 4-cyano-4-(phenylthioformylthio)pentanoic acid and 8.2mg azobis Isobutyronitrile was added to 6mL of toluene and stirred and mixed uniformly, then the water and oxygen were removed by the cycle of freezing-evacuating-argon gas three times, heating to 50℃ for 12 hours, the reaction solution was precipitated in n-hexane to obtain long-branched branches Copolymer 3a.

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

[0090]

[0091] In a nitrogen atmosphere, 20.9μL N,N,N',N,'N”-pentamethyldiethylenetriamine, 29.3mg macromolecular intermediate 3...

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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 polymer electrolytes for lithium ion batteries, and more specifically, relates to a long-chain branched single-ion polymer electrolyte, its preparation and application. Background technique [0002] Highly polluting and unstable fossil fuel resources make mankind face huge challenges from environmental pollution and climate change. People urgently need new energy storage and conversion technologies to reduce their dependence on traditional, non-renewable resources. Among them, lithium-ion batteries are particularly popular with people due to their high energy density and large 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 polymer electrolytes. [0003] According to the different substrates used, solid polymer elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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