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A solid electrolyte membrane and its preparation method and application

A solid electrolyte membrane and electrolyte membrane technology, applied in the field of lithium-ion batteries, can solve problems such as poor compatibility and no large-scale production, and achieve the effects of low cost, reduced impedance, and improved safety and stability.

Inactive Publication Date: 2018-12-21
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, solid polymer electrolytes have disadvantages such as poor compatibility, and plasticizers may be reduced at the negative electrode, so there is no large-scale production

Method used

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  • A solid electrolyte membrane and its preparation method and application
  • A solid electrolyte membrane and its preparation method and application

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preparation example Construction

[0042] The present invention provides a method for preparing the above solid electrolyte membrane, which specifically includes the following steps:

[0043] S1. Dissolve the matrix and the lithium salt in an organic solvent, ultrasonically disperse, and fully stir to obtain a mixed solution. In the total mass of the matrix and the lithium salt, the content of the lithium salt is 10 wt% to 70 wt%. The concentration of the matrix in the mixed solution is 10-30 wt%. There are no special requirements for the selection of organic solvents, and can be selected according to actual needs. For example, in the embodiment of the present invention, the solvent may be at least one of N,N-dimethylformamide (DMF), N-methylpyrrolidone (NMP), acetonitrile and acetone.

[0044] The solution including the matrix and the lithium salt is ultrasonically dispersed for sufficient dissolution. There is no special requirement for the ultrasonic dispersion time and can be adjusted according to actual need...

Embodiment 1

[0054] A solid electrolyte membrane composed of polyvinylidene fluoride (PVDF), lithium bis(trifluoromethylsulfonate) imide (LITFSI), LLZTO (Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 ), bis(trifluoromethylsulfonyl) 1-ethyl-3-methylimidazole (EMITFSI), and ethylene carbonate (EC).

[0055] The preparation method is as follows: first dissolve PVDF and LITFSI in DMF solvent, stir magnetically at 60° C. for 8 hours to obtain a mixed solution. Among them, LITFSI accounts for 30wt% of the total mass of PVDF and LITFSI, and the mass concentration of the PVDF solution is 10%. Then, add nanometer Li to the mixed solution of PVDF and LITFSI in sequence 6.4 La 3 Zr 1.4 Ta 0.6 O 12 , EMITFSI and EC, added Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 Account for Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 And 10wt% of the total mass of PVDF, the added masses of EMITFSI and EC are respectively 20wt% of the total mass of the EMITFSI and PVDF mixture, and 5wt% of the total mass of the EC and PVDF mixture, continue magnetic stirring f...

Embodiment 2

[0057] A solid electrolyte membrane consisting of polyethylene oxide (PEO), lithium bis(trifluoromethylsulfonate) imide (LITFSI), LLZTO (Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 ), bis(trifluoromethylsulfonyl) 1-ethyl-3-methylimidazole (EMITFSI), and ethylene carbonate (EC).

[0058] The preparation method is as follows: first dissolve PEO and LITFSI in DMF solvent, and magnetically stir at 60°C for 8 hours to obtain a mixed solution. Among them, LITFSI accounts for 30wt% of the total mass of PEO and LITFSI, and the mass concentration of the PVDF solution is 10%. After that, add nanometer Li to the PEO and LITFSI mixed solution. 6.4 La 3 Zr 1.4 Ta 0.6 O 12 , EMITFSI and EC, added Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 Account for Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 And 20wt% of the total mass of PEO, the added masses of EMITFSI and EC are respectively 20wt% of the total mass of the EMITFSI and PEO mixture, and 5wt% of the total mass of the EC and PEO mixture. Continue magnetic stirring for 4h and fully ...

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Abstract

A method for preparing a solid electrolyte membrane and its application are provided. The method comprises dissolving a substrate and lithium salt in an organic solvent, ultrasonically dispersing, uniformly stirring, and obtaining a mixed solution; adding inorganic ceramic fast ionic conductor filler, ionic liquid and plasticizer into the mixed solution, uniformly stirring to form slurry; coatingthe polytetrafluoroethylene mold with the slurry by a solution casting method to form a liquid film; drying the liquid film in vacuo to remove an organic solvent to obtain a solid electrolyte membrane. The electrolyte membrane of the invention has the advantages of high room temperature ionic conductivity, good electrochemical stability, high mechanical strength, good thermal stability, easy filmformation and the like, and the preparation method thereof is simple, does not contain liquid electrolyte, and has high safety performance. The electrolyte membrane of the invention can assemble all-solid-state lithium ion batteries and has good cycle performance.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a solid electrolyte membrane and a preparation method and application thereof. Background technique [0002] With the current market’s increasing demand for energy and the current situation attaches great importance to clean energy, the field of lithium-ion batteries has become a research focus. At present, the most widely used lithium battery electrolyte is an organic liquid electrolyte. However, there are still many safety hazards in the actual application process. This is mainly because the organic electrolyte components are prone to volatilization and leakage under extreme conditions, and are prone to fires and Safety accidents such as explosions. Compared with traditional lithium-ion batteries, all-solid-state lithium-ion batteries using solid electrolytes have higher safety and better thermal stability, high ion conductivity, good machining performance and many other advantag...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 李明涛杨浦杨伯伦屈龙
Owner XI AN JIAOTONG UNIV
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