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Composite solid electrolyte, and preparation method and applications thereof

A technology of solid electrolyte and solid electrolyte layer, applied in electrolytes, circuits, electrical components, etc., can solve problems such as liquid electrolyte leakage, decrease in bulk ionic conductivity, narrow electrochemical window, etc., to achieve inhibition of lithium dendrite growth, Ease of industrial production and wide electrochemical window

Active Publication Date: 2018-09-28
蓝谷智慧(北京)能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes combining two types of materials: either pure or mixed together for better performance compared with each other. It also includes specific features that make it easier than just mixing them separately without affecting their properties like electrical conduction. These technical improvements help improve battery safety by reducing potential hazards caused from reactions between different components within the batteries' structure during use.

Problems solved by technology

The technical problem addressed in this patents relates to finding ways to enhance the properties of conventional Li-ions based on solvents or nonvolatile liquids that could potentially cause issues like leaks over time and instabilities in electronic devices used therein.

Method used

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  • Composite solid electrolyte, and preparation method and applications thereof
  • Composite solid electrolyte, and preparation method and applications thereof
  • Composite solid electrolyte, and preparation method and applications thereof

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preparation example Construction

[0056] As an optional technical solution, the preparation method of the composite solid electrolyte includes the following steps:

[0057] (a) Add the polymer matrix and the lithium salt to the solvent and disperse to obtain the first mixed solution; the dispersion can be carried out by stirring to obtain a uniformly dispersed solution, such as mechanical stirring, magnetic stirring, etc.;

[0058] (b) adding part of the first mixed solution to the mold, volatilizing the solvent in vacuum, heating and vacuum drying to obtain the first solid electrolyte layer;

[0059] (c) Add an inorganic solid electrolyte to a part of the first mixed solution and disperse to obtain a second mixed solution; the dispersion can be carried out by stirring to obtain a uniformly dispersed solution, such as mechanical stirring, magnetic stirring, etc.; the inorganic solid electrolyte is usually in powder form Join, and disperse evenly;

[0060] (d) Pour the second mixed solution into the mold, evaporate the...

Embodiment 1

[0070] Select polyethylene oxide as the polymer matrix, and lithium bistrifluoromethanesulfonimide as the lithium salt, in which the mass ratio of the polymer matrix to the lithium salt is 0.5:1;

[0071] The polyoxyethylene and lithium bistrifluoromethanesulfonimide were dried at 50°C and 120°C for 24 hours, respectively, and then the polyoxyethylene and lithium bistrifluoromethanesulfonimide were dissolved in acetonitrile and dispersed uniformly to obtain the first A mixed solution;

[0072] The prepared first mixed solution is poured into a polytetrafluoroethylene mold to volatilize the acetonitrile solvent in a vacuum, and dried under vacuum at 50° C. to obtain a first solid electrolyte layer with a thickness ranging from 10 to 50 μm.

Embodiment 2

[0074] Highly selective polypropylene oxide is the molecular matrix, and lithium hexafluorophosphate is selected as the lithium salt, and the mass ratio of the two is 1:1;

[0075] For the preparation method of the first solid electrolyte layer of this embodiment 2, refer to embodiment 1.

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Abstract

The invention discloses a composite solid electrolyte. The composite solid electrolyte comprises a first solid electrolyte layer and a second solid electrolyte layer; the first solid electrolyte layeris a polymer solid electrolyte layer; the second solid electrolyte layer comprises a polymer solid electrolyte and an inorganic solid electrolyte; the mass amount of the second solid electrolyte layer accounts for 50 to 90% of that of the composite solid electrolyte; the mass amount of the inorganic solid electrolyte layer accounts for 10 to 70% of that of the second solid electrolyte layer. Theinvention also discloses a preparation method and applications of the composite solid electrolyte. The composite solid electrolyte possesses the advantages of the inorganic solid electrolyte and the polymer solid electrolyte; the conductivity is high; the electrochemical window is wide; lithium dendrite growth can be inhibited effectively; metal cathode efflorescence is avoided; the preparation method is simple, and is convenient for industrialized production.

Description

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Claims

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Application Information

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Owner 蓝谷智慧(北京)能源科技有限公司
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