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A kind of organic-inorganic composite lithium single-ion conductive material and preparation method

A conductive material, single-ion technology, used in circuits, electrical components, battery electrodes, etc., can solve problems such as failure to meet the requirements of high-performance lithium-ion batteries and low room temperature conductivity

Active Publication Date: 2021-06-01
YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the room temperature conductivity of the reported solid lithium single-ion conductors is still too small (generally 10 -8 ~10 -6 S cm -1 ), which cannot meet the requirements of high-performance lithium-ion batteries

Method used

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  • A kind of organic-inorganic composite lithium single-ion conductive material and preparation method
  • A kind of organic-inorganic composite lithium single-ion conductive material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Take 0.91g lithium aminotetrazolium salt, disperse it in 50mL DMSO, add an equimolar amount of IPDI diisocyanate (2.22g) dropwise at room temperature, stir until the emulsion becomes clear and set aside;

[0018] (2) Take 6.0 g of polyethylene glycol (PEG600) in a single-necked bottle, add an equimolar amount of triethoxysilyl propyl isocyanate (2.5 g) dropwise under stirring at 80°C, and stir for 4 hours to obtain a uniform transparent solution spare;

[0019] (3) Add the solution obtained in step (1) dropwise into the solution obtained in step (2) under stirring, and after reacting for 12 hours, add 0.1wt.% of H 2 O, after mixing evenly, apply a film; after the solvent is evaporated to dryness at 60°C, continue to dry at 80°C for 24 hours to obtain a solid film. The room temperature conductivity of the solid film is 1.5×10 -5 S cm -1 , the electrochemical window is 4.7V (for Li / Li + ), the lithium ion migration number is 0.89.

Embodiment 2

[0021] (1) Take 0.91g lithium aminotetrazolium salt, disperse it in 50mL DMSO, add an equimolar amount of IPDI diisocyanate (2.22g) dropwise at room temperature, stir until the emulsion becomes clear and set aside;

[0022] (2) Take 8.0 g of polyethylene glycol (PEG800) in a single-necked bottle, add dropwise an equimolar amount of triethoxysilyl propyl isocyanate (2.5 g) under stirring at 80°C, and stir for 6 hours to obtain a uniform and transparent The solution is ready for use;

[0023] (3) Add the solution obtained in step (1) dropwise to the solution obtained in step (2) while stirring, and after reacting for 12 hours, add 0.1wt.% of H 2 O. After mixing evenly, apply a film. After the solvent is evaporated to dryness at 60°C, continue to dry at 80°C for 24 hours to obtain a solid film. The conductivity at room temperature is 7.6×10 -6 S cm -1 , the electrochemical window is 4.6V (for Li / Li + ), the lithium ion migration number is 0.90.

Embodiment 3

[0025] (1) Take 0.91g lithium aminotetrazolium salt, disperse it in 50mL DMSO, add an equimolar amount of IPDI diisocyanate (2.22g) dropwise at room temperature, stir until the emulsion becomes clear and set aside;

[0026] (2) Take 10.0 g of polyethylene glycol (PEG1000) in a single-necked bottle, add dropwise an equimolar amount of triethoxysilyl propyl isocyanate (2.5 g) under stirring at 80 ° C, and stir for 6 hours to obtain a uniform and transparent The solution is ready for use;

[0027] (3) Add the solution obtained in step (1) dropwise to the solution obtained in step (2) while stirring, and after reacting for 12 hours, add 0.1wt.% of H 2 O. After mixing evenly, apply a film. After the solvent is evaporated to dryness at 60°C, continue to dry at 80°C for 24 hours to obtain a solid film. The room temperature conductivity of the solid film is 6.1×10 -7 S cm -1 , the electrochemical window is 4.6V (for Li / Li + ), the lithium ion migration number is 0.91.

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Abstract

The invention discloses a type of organic-inorganic composite lithium single-ion conductive material and a preparation method. The lithium salt containing active hydrogen groups is dispersed in DMSO, diisocyanate is added dropwise, and the isocyanate-functionalized lithium salt is prepared by stirring reaction. ; The polymerized polyol reacts with a silane coupling agent to obtain a monosiloxane-terminated polymerized polyol; then the isocyanate-functionalized lithium salt solution is added dropwise to the monosiloxane-terminated polymerized polyol, and after stirring the reaction, the After the ionized water is mixed evenly, the film is coated, and the solvent is evaporated to dryness and then dried, and the obtained solid film is a lithium single-ion conductive polymer material. In the present invention, a comb-shaped molecular chain formed by connecting a highly delocalized azole lithium salt and an ether oxygen chain through an isocyanate, through the construction of a comb-shaped azole lithium salt-polyurethane segment-molecular state siloxane phase molecular chain, Improve the mobility of the chain segment, increase the mobility of lithium ions and improve the stability of the interphase film of the battery.

Description

technical field [0001] The invention relates to a class of organic-inorganic composite lithium single-ion conductive material and a preparation method thereof, belonging to the field of composite materials and the field of electrochemical technology. Background technique [0002] Lithium-based secondary batteries (such as lithium-ion batteries, lithium-sulfur batteries, lithium-air batteries, etc.), due to their high specific energy and cycle efficiency, are considered to be the key technology to solve the current energy shortage in the world, and have received more and more attention. more and more attention. The electrolyte currently used is mainly a liquid electrolyte, which is to dissolve lithium salts (such as: lithium tetrafluoroborate, lithium hexafluorophosphate, etc.) in organic solvents (such as: propylene carbonate PC, ethylene carbonate EC, etc.) to make electrolyte. The liquid electrolyte has problems such as volatile, easy to leak, flammable and explosive, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 邓友全刘士民费玉清马祥元何昱德卢六斤
Owner YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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