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Composite solid polymer electrolyte film and preparation method and application thereof

A solid polymer and electrolyte membrane technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of difficult and uniform dispersion of nano-ceramic particles and not put into actual production, so as to reduce impedance, increase ionic conductivity, The effect of accelerating the migration rate

Inactive Publication Date: 2019-03-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the process of compounding nano-ceramic particles with solid polymer electrolyte, it is difficult to disperse nano-ceramic particles evenly. The current technology does not provide a more suitable process, so it has not been put into actual production.

Method used

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  • Composite solid polymer electrolyte film and preparation method and application thereof
  • Composite solid polymer electrolyte film and preparation method and application thereof
  • Composite solid polymer electrolyte film and preparation method and application thereof

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preparation example Construction

[0046] The invention proposes a method for preparing a composite solid electrolyte membrane, which specifically includes the following steps:

[0047] S1. Dissolving the polymer in an organic solvent, ultrasonically dispersing, and stirring evenly to obtain a mixed solution. The concentration of the polymer in the solution is 10-30 wt%. The selection of the organic solvent has no special requirements and can be selected according to actual needs. For example, in an embodiment of the present invention, the organic solvent is N,N-dimethylformamide, N,N-dimethylacetamide, N,N-dimethylpropanamide, N-methylpyrrolidone, acetonitrile , Acetone.

[0048] The solution containing the polymer is ultrasonically dispersed for sufficient dissolution. There is no special requirement for the ultrasonic dispersion time, which can be adjusted according to actual needs. For example, in an embodiment of the present invention, the ultrasonic dispersion time is 10 min-40 min. The solution incl...

Embodiment 1

[0060] A composite solid electrolyte membrane, the electrolyte membrane is made of polyvinylidene fluoride (PVDF), lithium perchlorate (LIClO 4 ), nano palygorskite, bis(trifluoromethylsulfonyl) 1-ethyl-3-methylimidazole (EMITFSI), and dimethyl carbonate (DMC).

[0061] The preparation method is as follows: firstly, PVDF is dispersed in DMF solvent, and magnetically stirred at 50° C. for 6 hours to obtain a mixed solution. During this process, the mass concentration of the PVDF solution was kept at 15%. Then, add LIClO to the PVDF solution sequentially 4 , Nano palygorskite, EMITFSI and DMC. Added LIClO 4 accounted for LIClO 4 and 20% of the total mass of nano palygorskite, the added nano palygorskite accounts for 10wt% of the total mass of nano palygorskite and PVDF, the quality of EMITFSI added is 10wt% of the total mass of EMITFSI and PVDF mixture, the quality of added DMC 3wt% of the total mass of the mixture of DMC and PVDF, and then continue to stir for 12 hours to ...

Embodiment 2

[0063] A composite solid electrolyte membrane, the electrolyte membrane is made of polyvinylidene fluoride (PVDF), lithium hexafluorophosphate (LIPF 6 ), nano palygorskite, bis(trifluoromethylsulfonyl) 1-ethyl-3-methylimidazole (EMITFSI), and ethylene carbonate (EC).

[0064] The preparation method is as follows: firstly, PVDF is dispersed in DMP solvent, and magnetically stirred at 60° C. for 6 hours to obtain a mixed solution. During this process, the mass concentration of the PVDF solution was kept at 10%. Then, add LIPF to the PVDF solution sequentially 6 , nano palygorskite, EMITFSI and EC. Joined LIPF 6 accounted for LIPF 6 and 20% of the total mass of nano palygorskite, the added nano palygorskite accounts for 15wt% of the total mass of nano palygorskite and PVDF, the quality of added EMITFSI is 10wt% of the total mass of EMITFSI and PVDF mixture, the quality of added EC 10wt% of the total mass of the mixture of EC and PVDF, and then continue to stir for 12 hours t...

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Abstract

A composite solid polymer electrolyte film and a preparation method and an application thereof are provided. The preparation method includes the following steps: dissolving a polymer in an organic solvent, and stirring the solution evenly after ultrasonic dispersion; adding lithium salt, nano-ceramic particles, ionic liquid and plasticizer, and stirring the mixed solution evenly to form slurry; applying the slurry to a glass plate to form a liquid film; and drying the liquid film to obtain a composite solid polymer electrolyte film. The composite solid polymer electrolyte film of the inventionhas high room-temperature ionic conductivity and mechanical strength, is prepared through a simple process and can be mass-produced. Moreover, the composite solid polymer electrolyte film of the invention has good electrochemical performance when applied to lithium ion batteries.

Description

technical field [0001] The invention relates to the field of novel lithium-ion battery electrolytes, in particular to a composite solid polymer electrolyte membrane and its preparation method and application. Background technique [0002] With the depletion of non-renewable resources such as petroleum and coal, and the use of these energy sources will produce a certain degree of environmental pollution. Therefore, the task of finding a clean, green, and high-energy-density energy storage medium is imminent. Among various clean secondary energy sources, lithium-ion batteries are undoubtedly the one with the highest attention. Traditional lithium-ion batteries generally use organic solvents containing lithium salts as electrolytes. Although this form of electrolyte has high ionic conductivity and is conducive to the transmission of lithium ions in the battery, the compatibility of metal lithium and liquid electrolytes is poor. Lithium dendrites are generated during the charg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 李明涛杨浦屈龙杨伯伦
Owner XI AN JIAOTONG UNIV
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