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Polyethersulfone single-ion polymer and single-ion gel polymer electrolyte

A gel polymer and ionic polymer technology, applied in the field of single-ion gel polymer electrolyte, can solve problems affecting battery stability, affecting battery performance, accelerating lithium dendrite growth, etc.

Active Publication Date: 2021-07-30
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

During the charging and discharging process of the battery, due to the difference in the moving rate of anions and cations, concentration polarization will occur, which will affect the stability of the battery.
At the same time, the reduction of the migration number of lithium ions will accelerate the growth of lithium dendrites, which will affect the performance of the battery and even cause safety accidents such as explosions.

Method used

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  • Polyethersulfone single-ion polymer and single-ion gel polymer electrolyte
  • Polyethersulfone single-ion polymer and single-ion gel polymer electrolyte
  • Polyethersulfone single-ion polymer and single-ion gel polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 Preparation of lithium 3-chloropropanesulfonyl (trifluoromethanesulfonyl)imide (LiCPSI)

[0054] Under a nitrogen atmosphere, add 20 mmol (2.9818 g) of trifluoromethanesulfonamide and 40 mmol (0.9572 g) of LiOH into 20 ml of anhydrous acetonitrile, and add 20 mmol (3.541 g) of ) of 3-chloropropanesulfonyl chloride. Subsequently, the reaction was carried out at room temperature for 24 h, acetonitrile was removed by rotary evaporation, and the obtained solid lithium 3-chloropropanesulfonyl(trifluoromethanesulfonyl)imide (LiCPSI) was recrystallized in dichloromethane, and 7.4125 g of white solid was obtained by filtration.

Embodiment 2

[0055] Example 2 Containing methoxy polyethersulfone (PES-OCH 3 ) preparation

[0056] In a three-necked flask equipped with a mechanical stirrer, a nitrogen inlet tube, a thermometer, and a water separator, add 5.6056 g of 2-methoxyhydroquinone (MHQ) and 10.17 g of 4,4'-difluorodiphenyl sulfone in sequence (FPS), 6.624 g of anhydrous potassium carbonate, 50 ml of sulfolane (TMS), and 18 mL of toluene were heated to 140-170 °C for 12 h under stirring with nitrogen gas to obtain a viscous solution, and then the viscous solution was added to distilled water. After cooling, the product is pulverized, washed with deionized water and ethanol, and dried to obtain methoxy-containing polyethersulfone (PES-OCH 3 ).

Embodiment 3

[0057] Example 3 Preparation of hydroxyl-containing polyethersulfone (PES-OH)

[0058] In a three-necked flask equipped with a mechanical stirrer, a nitrogen inlet tube, a thermometer, and a water separator, the PES-OCH obtained in 6 g of Example 2 was 3 Dissolve in anhydrous chloroform, add 60 ml of chloroform solution containing 10% boron tribromide dropwise at -40 °C, react at room temperature for 12 h, sink into ethanol, wash with deionized water and ethanol, and dry to obtain Hydroxypolyethersulfone (PES-OH).

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Abstract

The invention provides a polyethersulfone single-ion polymer. The chemical structure of the polyethersulfone single-ion polymer is shown as a formula (I) in the description. The preparation method comprises the steps of firstly, preparing methoxy-containing polyethersulfone; demethylating the polyethersulfone containing the methoxy group by using boron tribromide; and finally, enabling hydroxyl-containing polyether sulfone and organic lithium salt 3-chloropropane sulfonyl (trifluoromethanesulfonyl) lithium imide to be subjected to a reaction, and obtaining the polyethersulfone single-ion polymer. As anions are fixed on a polyethersulfone matrix, only Li < + > moves in the system. The lithium bis (sulfonyl) imide part has low ion dissociation domain energy, so that dissociation and transmission of lithium ions are promoted, more lithium sources are provided, high lithium ion conductivity of the system is ensured, and the Li < + > transference number of the electrolyte is increased; and then the electrochemical performance and the stability of the battery are improved. The invention also provides a single-ion gel polymer electrolyte, which is prepared by blending the polyethersulfone single-ion polymer and a functional polymer, casting and soaking to obtain the gel polymer electrolyte. The prepared single-ion gel polymer electrolyte has excellent and stable battery performance, and can be widely applied to the fields of lithium ion batteries and lithium metal batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium battery application, in particular to a polyethersulfone single-ion gel polymer and a single-ion gel polymer electrolyte made from it. Background technique [0002] Due to the excessive consumption of fossil energy, air pollution and global warming, the development of modern civilization has encountered a bottleneck. [0003] One of the ways is to develop and effectively use green energy. Lithium-ion batteries are widely used due to their specific energy density, cost and safety [0004] It has become one of the focuses of people's attention. At present, lithium-ion batteries (LIBs) are widely used in portable electronic devices such as mobile phones and notebook computers, electric vehicles, and large-scale power storage systems, playing an important role in daily life. A traditional lithium-ion battery is composed of a liquid organic electrolyte, a separator, a positive electrode, and a negat...

Claims

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Application Information

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IPC IPC(8): C08G75/23H01M10/0565H01M10/0525
CPCC08G75/23H01M10/0565H01M10/0525H01M2300/0082Y02E60/10
Inventor 呼微尤莹雪梁笑笑杜新伟赵麒刘佰军
Owner 吉林省东驰新能源科技有限公司
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