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Flexible electrolyte material based on lithium sulfonimide quasi-solid polymer as well as preparation method and application of flexible electrolyte material

A flexible electrolyte, lithium sulfonylimide technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of lack of flexibility and stretchability, and achieve good electrochemical stability, high ionic conductivity, The effect of mild reaction conditions

Pending Publication Date: 2022-06-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported sulfonimide polymer electrolytes basically use pure carbon chains or phenyl groups as the main chain (Cao, C.; Li, Y., et al.ACS Appl MaterInterfaces 2019, 11(39) , 35683-35692.), or polyethylene glycol with very high content of room temperature crystalline polymers (Zhang, M.; Yu, S., et al. Chem Commun (Camb) 2019, 55(47), 6715- 6718.; Chen, Y.; Li, C., et al.J.Membr.Sci.2021, 620.), which lead to electrolytes generally showing rigidity, not flexible and stretchable

Method used

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  • Flexible electrolyte material based on lithium sulfonimide quasi-solid polymer as well as preparation method and application of flexible electrolyte material
  • Flexible electrolyte material based on lithium sulfonimide quasi-solid polymer as well as preparation method and application of flexible electrolyte material
  • Flexible electrolyte material based on lithium sulfonimide quasi-solid polymer as well as preparation method and application of flexible electrolyte material

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Experimental program
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Effect test

Embodiment 1

[0049] A preparation method of a quasi-solid sulfonimide-based polymer flexible electrolyte material based on sulfonimide, the steps are as follows:

[0050] 1) Under argon protection, 0.3334g isophorone diisocyanate and 0.5575g poly(propylene glycol)-block-poly(L glycol)-block-poly(propylene glycol) triblock polyether ( Mn=2700) under the catalysis of 0.0050 g of stannous octoate, the reaction was stirred at 60° C. for 4 h, during which 3 mL of N,N-dimethylformamide was added to dilute. The product was reacted with 0.0225 g of glycerol at 75° C. for 2 h, during which 2 mL of N,N-dimethylformamide was added to dilute. The product was reacted with 0.5595 g of trifluoromethanesulfonimide polymer lithium salt at 85° C. for 3 h, during which 3 mL of N,N-dimethylformamide was added to dilute. After the reaction is completed, a sulfonimide-type prepolymer is obtained, and the product is kept in a solution state and protected by argon gas.

[0051] 2) 0.1200 g of hydroxypropyl-β-c...

Embodiment 2

[0054] A preparation method of a quasi-solid sulfonimide-based polymer flexible electrolyte material based on sulfonimide, the steps are as follows:

[0055] 1) Under the protection of argon, 0.3334g isophorone diisocyanate and 0.7425g poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) triblock polyether ( Mn=2700) under the catalysis of 0.0030 g of dibutyltin dilaurate, the reaction was stirred at 85° C. for 2 h, during which 2 mL of N,N-dimethylformamide was added to dilute. The product was reacted with 0.0270 g of trimethylolpropane at 85° C. for 3 h, during which 2 mL of N,N-dimethylformamide was added for dilution. The product was reacted with 0.7460 g of trifluoromethanesulfonimide polymer lithium salt at 85° C. for 3 h, during which 3 mL of N,N-dimethylformamide was added to dilute. After the reaction is completed, a sulfonimide-type prepolymer is obtained, and the product is kept in a solution state and protected by argon gas.

[0056] 2...

Embodiment 3

[0059] A preparation method of a quasi-solid sulfonimide-based polymer flexible electrolyte material based on sulfonimide, the steps are as follows:

[0060] 1) 0.3334g isophorone diisocyanate and 0.8025g poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) triblock polyether ( Mn=3300) in 0.0050g of dibutyltin dilaurate catalyzed by argon to stir the reaction at 65°C for 2h, during which 2mL of dimethyl sulfoxide was added to dilute. The product was reacted with 0.0330 g of trimethylolpropane at 65° C. for 3 h, during which 3 mL of dimethyl sulfoxide was added for dilution. The product was reacted with 0.7680 g of p-benzenesulfonimide polymer lithium salt at 85° C. for 5 h, during which 3 mL of dimethyl sulfoxide was added to dilute. After the reaction is completed, a sulfonimide-type prepolymer is obtained, and the product is kept in a solution state and protected by argon gas.

[0061] 2) 0.0875 g of β-cyclodextrin was added to the sulfonimide-...

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Abstract

The invention discloses a flexible electrolyte material based on a lithium sulfonimide quasi-solid polymer as well as a preparation method and application of the flexible electrolyte material. According to the preparation method, diisocyanate is used as a hard segment, polyether polyol is used as a soft segment, a sulfimide polymer lithium salt is used as a conductive ion chain segment, and a small-molecule polyhydroxy compound is used as a cross-linking center, high-temperature reaction is carried out under the catalysis condition of a water-free and oxygen-free catalyst, and vacuum high-temperature drying is carried out to obtain the polymer membrane material. And infiltrating with an organic electrolyte to obtain the quasi-solid polymer flexible electrolyte material. The prepared electrolyte material has the advantages of excellent mechanical property, good electrochemical stability and high ionic conductivity, can be applied to the fields of lithium ion batteries, lithium metal batteries, flexible soft package lithium batteries and the like, and greatly improves the safety performance of the lithium batteries. The preparation method provided by the invention has the characteristics of easily available raw materials, controllable process, mild conditions and the like, can be used for industrial large-scale production, and has good practicability.

Description

technical field [0001] The present application belongs to the technical field of lithium battery electrolyte new materials and polymers; in particular, it relates to a flexible electrolyte material based on a lithium sulfonimide quasi-solid polymer, and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used due to their high energy density, high operating voltage, and no memory effect. From small wearable electronic devices to large new energy vehicles, they are inseparable from the power supply of lithium batteries. In order to achieve the goal of carbon peaking and carbon neutrality, the proportion of new energy power generation such as photovoltaics and wind energy has increased year by year, and lithium-ion batteries also play a crucial role in the field of new energy storage. However, the liquid electrolyte systems (dual-ion lithium salts, organic electrolytes, separators) used in traditional lithium ions ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565C08G18/50C08G18/48
CPCH01M10/0565C08G18/5072C08G18/4837C08G18/4804H01M2300/0082
Inventor 贾叙东蔡一枫张秋红刘彩霞吴昊旻马文灿
Owner NANJING UNIV
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