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A kind of polyester block copolymer, its one-pot synthesis method and application

A technology of block copolymers and polyesters, applied in the field of polymer electrolytes for lithium ion batteries, can solve the problems of complex preparation methods and uncontrollable reactions, and achieve the advantages of enhancing room temperature ions, overcoming low mechanical strength, and overcoming catalyst metal residues. Effect

Active Publication Date: 2022-03-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a method for preparing polyester block copolymer electrolytes in one pot, aiming at solving the problem that the polyester block copolymer electrolytes in the prior art need to be prepared by step-by-step feeding method. Technical problems such as realization, complex preparation method, uncontrollable reaction, etc.

Method used

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  • A kind of polyester block copolymer, its one-pot synthesis method and application
  • A kind of polyester block copolymer, its one-pot synthesis method and application
  • A kind of polyester block copolymer, its one-pot synthesis method and application

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Embodiment 1

[0046] A kind of polyester block copolymer base polymer electrolyte has the chemical structure of following formula:

[0047]

[0048] The preparation of the polyester block polymer-based electrolyte, such as figure 1 shown, including the following steps:

[0049] (1) Under anhydrous and oxygen-free conditions, 1.8g of styrene, 4.15g of ε-caprolactone, and 3.4g of poly(ethylene glycol) methacrylate monomers were uniformly mixed to form a monomer mixture;

[0050] (2) Add 11.21mg of 4,4'-azobis(4-cyanovaleric acid) and 29.33mg of 2-(benzylsulfanylthiocarbonylsulfanyl)ethanol to the monomer mixture and mix well;

[0051] (3) Raise the raw material mixture to 50°C for 36 hours in an argon atmosphere to allow reversible addition-fragmentation transfer polymerization of vinyl monomers, and then raise the temperature to 110°C for 48 hours to allow ring-opening polymerization of cyclic lactones . After the reaction is completed, the reaction is cooled to room temperature, and t...

Embodiment 2

[0058] A kind of polyester block copolymer base polymer electrolyte has the chemical structure of following formula:

[0059]

[0060] The preparation of the polyester block polymer-based electrolyte comprises the following steps:

[0061] (1) Under anhydrous and oxygen-free conditions, 2.50g styrene, 4.9g δ-valerolactone, and 2.8g poly(ethylene glycol) methacrylate monomers were uniformly mixed to form a monomer mixture;

[0062] (2) Add 11.21mg of 4,4'-azobis(4-cyanovaleric acid) and 29.33mg of 2-(benzylsulfanylthiocarbonylsulfanyl)ethanol to the monomer mixture and mix well;

[0063] (3) Raise the raw material mixture to 60°C for 30 hours in an argon atmosphere to allow reversible addition-fragmentation transfer polymerization of vinyl monomers, and then raise the temperature to 120°C for 40 hours to allow ring-opening polymerization of cyclic lactones . After the reaction is completed, the reaction is cooled to room temperature, and the reaction is quenched to obtain ...

Embodiment 3

[0069] A kind of polyester block copolymer base polymer electrolyte has the chemical structure of following formula:

[0070]

[0071] The preparation of the polyester block polymer-based electrolyte comprises the following steps:

[0072] (1) Under anhydrous and oxygen-free conditions, uniformly mix 2.14g styrene, 10.6g DL-lactide, and 2.24g poly(ethylene glycol) methacrylate monomers to form a monomer mixture;

[0073] (2) Add 11.21mg of 4,4'-azobis(4-cyanovaleric acid) and 29.33mg of 2-(benzylsulfanylthiocarbonylsulfanyl)ethanol to the monomer mixture and mix well;

[0074] (3) Raise the temperature of the raw material mixture to 70°C for 24 hours in an argon atmosphere to allow reversible addition-fragmentation transfer polymerization of vinyl monomers, and then raise the temperature to 130°C for 32 hours to allow ring-opening polymerization of cyclic lactones . After the reaction is completed, the reaction is cooled to room temperature, and the reaction is quenched t...

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Abstract

The invention belongs to the field of polymer electrolytes for lithium-ion batteries, and more specifically relates to a polyester block copolymer, its one-pot synthesis method and application. The one-pot method for synthesizing polyester-based block copolymer-based polymer electrolytes proposed by the present invention can be achieved in one pot by selecting suitable reaction monomers and using suitable bifunctional chain transfer reagents and free radical initiators. Combining reversible addition-fragmentation transfer polymerization and ring-opening polymerization of cyclic lactones, it is more convenient, quick, green and efficient to synthesize polyester block copolymers with controllable molecular weight and narrow distribution. The one-pot method for synthesizing polyester block copolymer-based electrolytes proposed by the invention provides a new idea for the synthesis of solid polymer electrolyte materials with excellent mechanical strength and electrochemical performance.

Description

technical field [0001] The invention belongs to the field of polymer electrolytes for lithium-ion batteries, and more specifically relates to a polyester block copolymer, its one-pot synthesis method and application. Background technique [0002] Polyester compounds (such as polycarbonate and polyester) contain C=O bonds and C-O bonds, which can coordinate and dissociate with lithium ions, and the ester group with a large dipole moment can strengthen the dissociation of lithium salts and Promote the migration of lithium ions in the polymer matrix, thereby increasing the migration number of lithium ions. Compared with traditional polyether polymers, polyester polymers are more environmentally friendly, biocompatible and thermally stable. In addition, polyester-based electrolytes have better anode stability to high-voltage environments during Li-ion transport. Therefore, the use of polyester polymers as the matrix of all-solid-state lithium-ion batteries has a wider operatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/688C08G63/78C08F293/00H01M10/0565
CPCC08G63/6882C08G63/78C08F293/005H01M10/0565C08F2438/03Y02E60/10
Inventor 薛志刚郭楷瑞李少桥王计嵘周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH
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