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Five-block polymer, preparation method and application thereof, and five-block polymer electrolyte

A pentablock and polymer technology, applied in the manufacture of non-aqueous electrolytes, solid electrolytes, electrolyte batteries, etc., can solve the problem of low ion conductivity of lithium-ion batteries, high crystallinity of polyethylene oxide at room temperature, and low lithium-ion conductivity, etc. question

Pending Publication Date: 2022-05-27
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Despite the above advantages, poly(ethylene oxide) has the defect of high crystallinity at room temperature, which leads to low conductivity of lithium ions, making the ionic conductivity of lithium-ion batteries low

Method used

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  • Five-block polymer, preparation method and application thereof, and five-block polymer electrolyte
  • Five-block polymer, preparation method and application thereof, and five-block polymer electrolyte
  • Five-block polymer, preparation method and application thereof, and five-block polymer electrolyte

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preparation example Construction

[0041] The present invention provides a method for preparing the above-described five-block polymer, comprising the following steps:

[0042] (1) The polyethylene oxide - polypropylene oxide - polyethylene oxide, bromoisobutyryl bromide, the first catalyst and the first organic solvent having the structure shown in formula b are mixed to obtain a macromolecular initiator having a structure shown in formula c;

[0043]

[0044] (2) The macromolecule initiator, styrene, second catalyst and second organic solvent having the structure shown in formula C are mixed to carry out atomic transfer radical polymerization reaction to obtain a five-block copolymer having the structure shown in formula a.

[0045] The present invention will have a structure shown in formula b polyethylene - polypropylene oxide - polyethylene oxide, bromoisobutyryl bromide, a first catalyst and a first organic solvent mixed, to give a macromolecular initiator having a structure shown in formula c. The present ...

Embodiment 1

[0076] Preparation of the five-block polymer electrolyte, the steps are as follows:

[0077] (1) 25.2g molecular weight 12600g / mol polyethylene oxide (PEO) - polypropylene oxide (PPO) - polyethylene oxide (PEO), 0.7330g4-dimethylaminopyridine, 0.66mL triethylamine dissolved in dichloromethane, the air in the device is excluded. The 1.24mL bromoisobutyryl bromide was dissolved in dichloromethane and slowly added to the above solution, and the reaction was stirred at room temperature for 24h to give PEO-PPO-PEO macromolecule initiator.

[0078] (2) 2.5512g PFO-PEO macromolecule initiator in step 1, 0.0574g cuprous bromide, 0.2mLN, N,N', N",N"-pentamethyldivinyltriamine, 2.3mL styrene dissolved in 1,4-dioxane, stirred at 100 °C for 24h to give a five-block polymer.

[0079] (3) 0.5g block polymer, 0.1430g LiTFSI dissolved in N, N- dimethylformamide, stirred at room temperature for 12h, the resulting slurry was scraped onto a 10×20cm rectangular polypropylene plate, dried at 60 °C i...

Embodiment 2

[0089]Preparation of the five-block polymer electrolyte, the steps are as follows:

[0090] (1) 25.2g molecular weight 12600g / mol polyethylene oxide (PEO) - polypropylene oxide (PPO) - polyethylene oxide (PEO), 0.7330g4-dimethylaminopyridine, 0.66mL triethylamine dissolved in dichloromethane, the air in the device is excluded. The 1.24mL bromoisobutyryl bromide was dissolved in dichloromethane and slowly added to the above solution, and the reaction was stirred at room temperature for 24h to give PEO-PPO-PEO macromolecule initiator.

[0091] (2) 2.5512g PFO-PEO macromolecule initiator in step 1, 0.0574g cuprous bromide, 0.2mLN, N,N', N",N"-pentamethyldivinyltriamine, 2.8mL styrene dissolved in 1,4-dioxane, stirred at 110 °C for 24h to give a five-block polymer.

[0092] (3) 0.5g five-block polymer, 0.1267g LiTFSI dissolved in N, N-dimethylformamide, stirred at room temperature for 12h, the resulting slurry was scraped onto a 10×20cm rectangular polypropylene plate, dried at 60 °...

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Abstract

The invention provides a five-block polymer, a preparation method and application thereof, and a five-block polymer electrolyte, and belongs to the technical field of polymer electrolytes. The five-block polymer provided by the invention contains a polypropylene oxide (PPO) block, so that ordered arrangement of the polyethylene oxide (PEO) block can be disrupted, and the crystallinity of the PEO block is reduced; meanwhile, the styrene block can inhibit lithium dendrites and improve the mechanical strength of the polymer electrolyte. Meanwhile, the five-block polymer provided by the invention also has the advantages of good film-forming property and high thermal stability. The result of the embodiment shows that when the penta-block polymer provided by the invention is used as the electrolyte of the lithium ion battery, the conductivity at 70 DEG C is 2.87 * 10 <-4 > S / cm, and the penta-block polymer has excellent rate capability; and the lithium ion transference number can reach 0.31 and is higher than 0.2 of the pure polyoxyethylene-based polymer electrolyte.

Description

Technical field [0001] The present invention relates to the field of polymer electrolyte technology, in particular to a five-block polymer and preparation method and application thereof, a five-block polymer electrolyte. Background [0002] Lithium-ion batteries have the advantages of high energy density, large output power, high voltage, small self-discharge, wide operating temperature range, no memory effect and environment friendliness, and have been widely used in electric vehicles, rail transit, large-scale energy storage and aerospace and other fields. However, at present, most commercial lithium-ion batteries still use organic liquid electrolytes, which have safety problems such as easy leakage and explosion. Replacing liquid electrolytes with solid electrolytes has proven to be an ideal solution to the safety of lithium-ion batteries. [0003] At present, solid electrolytes are mainly divided into inorganic solid electrolytes and polymer solid electrolytes. In the solid e...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058H01M2300/0082Y02P70/50
Inventor 谢海明张晓蓉刘军
Owner 吉林省东驰新能源科技有限公司
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