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Ionic plastic crystal-polymer-inorganic composite electrolyte membrane and preparation method and application thereof

An inorganic composite film and inorganic composite technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of difficult long-term charge and discharge cycles, poor mechanical properties, etc., achieve good cycle stability, large load capacity, and improve mechanical strength. Effect

Active Publication Date: 2020-06-09
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solid electrolyte proposed by Fortysh is prepared by using the salt of dialkylpyrrolidine and trifluoromethylsulfonimide as a matrix, and its room temperature conductivity can reach 10 -4 S / cm, has good chemical / electrochemical stability and high temperature resistance, but it still has poor mechanical properties and is difficult to withstand long-term charge-discharge cycles in the application process.

Method used

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  • Ionic plastic crystal-polymer-inorganic composite electrolyte membrane and preparation method and application thereof
  • Ionic plastic crystal-polymer-inorganic composite electrolyte membrane and preparation method and application thereof
  • Ionic plastic crystal-polymer-inorganic composite electrolyte membrane and preparation method and application thereof

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[0037] Another aspect of the embodiments of the present invention provides a method for preparing an ionic plastic crystal-polymer-inorganic composite electrolyte membrane, which includes:

[0038] Mix the polymer and inorganic nanoparticles uniformly in a solvent, and prepare a porous organic-inorganic composite membrane by solution casting or phase separation;

[0039] Uniformly mixing the ionic plastic crystal compound and the lithium salt in a solvent to form an ionic plastic crystal electrolyte solution;

[0040] The porous organic-inorganic composite membrane is soaked in the ion-type plastic crystal electrolyte solution, and the solvent is removed to obtain an all-solid-state ion-type plastic crystal-polymer-inorganic composite electrolyte membrane.

[0041] In some preferred embodiments, the mass ratio of the polymer to the inorganic nanoparticles is 1:1-20:1.

[0042] Further, the polymer includes any one or a combination of two or more of polyvinylidene fluoride-hex...

Embodiment 1

[0069] Dissolve 1g of PVDF and 1g of silicon dioxide in 10g of N,N-dimethylformamide, and use the phase separation method on a glass mold to obtain PVDF-SiO with a thickness of about 60 μm 2 Composite porous support membrane, immerse the composite porous support membrane in the acetone solution of dissolving 1g N-ethyl-N-methylbisfluorosulfonimide pyrrole salt and 0.02g LiFSI to absorb the ionic plastic crystal electrolyte for 0.5h, and the composite porous support membrane The support membrane was taken out on a polytetrafluoroethylene plate and the solvent was volatilized at 80°C for 12 hours under vacuum to obtain an all-solid ionic plastic crystal-polymer-inorganic composite electrolyte membrane. The mass of the ion-type plastic crystal electrolyte supported by the composite porous support membrane is 100 times that of the polymer-inorganic composite porous support membrane.

[0070] The impedance test chart of the all-solid-state ionic plastic crystal-polymer-inorganic co...

Embodiment 2

[0072]A composite plastic crystal polymer electrolyte material consists of polymer matrix PEO 1g, active nanofiller LLZTO 0.5g, lithium salt LiFSI 0.1g, ionic plastic crystal material N-ethyl-N-methyl bisfluorosulfonimide pyrrole The salt is composed of 0.6g, PEO is dissolved in 3g N,N-dimethylacetamide, and then the active nanofiller is ultrasonically dispersed in acetone, and finally the two solutions are mixed and cast on a glass plate, and the formed polymer The matrix was evaporated at 80°C for 12 hours under vacuum, and soaked in a solution mixed with 0.6g of the plastic crystal material N-ethyl-N-methylbisfluorosulfonimide pyrrole salt and 0.1g of LiFSI in the dried matrix for 24h, Continue drying at 70° C. for 25 hours under vacuum to obtain an all-solid ionic plastic crystal-polymer-inorganic composite electrolyte membrane.

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Abstract

The invention discloses an ionic plastic crystal-polymer-inorganic composite electrolyte membrane and a preparation method and application thereof. The ionic plastic crystal-polymer-inorganic composite electrolyte membrane comprises a porous organic-inorganic composite membrane and an ionic plastic crystal electrolyte composite material, the porous organic-inorganic composite membrane has a continuous three-dimensional network structure, the ionic plastic crystal electrolyte composite material is distributed on the surface of the three-dimensional network structure and/or in contained holes, and the ionic plastic crystal electrolyte composite material comprises an ionic plastic crystal compound and a lithium salt. The ionic plastic crystal-polymer-inorganic composite electrolyte membrane disclosed by the invention has the advantages of simple preparation process, excellent mechanical strength, high ionic conductivity, wide electrochemical stability window, lithium dendritic crystal inhibition, high temperature resistance, flame retardance and the like.

Description

technical field [0001] The invention relates to a solid electrolyte membrane, in particular to an all-solid ionic plastic crystal-polymer-inorganic composite electrolyte membrane, its preparation method and application, and belongs to the technical field of electrolyte materials. Background technique [0002] At present, most lithium-ion batteries on the market use liquid organic electrolytes as electrolytes, which have poor thermal safety performance and are volatile, and are easy to be ignited to induce fire accidents. In addition, there are limited electrochemical windows, poor thermal stability, and high current Poor cycle stability and incompatibility with new electrodes. Therefore, it is a reliable solution to replace the traditional organic electrolyte with a new type of polymer electrolyte. As solid materials, they can avoid leakage problems, while the high degree of flexibility of the polymer can give the battery a higher degree of freedom in shape, simplify materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565Y02E60/10
Inventor 许晶晶孙一洋吴晓东卢威
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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