Ultrathin composite solid-state electrolyte membrane and preparation method thereof

A technology of solid electrolyte membrane and solid electrolyte, applied in solid electrolyte, non-aqueous electrolyte, circuit, etc., can solve the problems of insufficient electrochemical performance, difficult demoulding, poor mechanical properties of composite solid electrolyte membrane, etc., and achieve good electrochemical performance , easy demoulding, excellent mechanical tensile properties

Pending Publication Date: 2021-07-23
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to provide an ultra-thin composite solid electrolyte membrane and its preparation method to solve the problems of poor mechanical properties, difficult demoulding and insufficient electrochemical performance of the existing composite solid electrolyte membrane

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  • Ultrathin composite solid-state electrolyte membrane and preparation method thereof
  • Ultrathin composite solid-state electrolyte membrane and preparation method thereof
  • Ultrathin composite solid-state electrolyte membrane and preparation method thereof

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Embodiment Construction

[0029] The application will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] The ultra-thin composite solid electrolyte membrane disclosed by the invention has a thickness of about 20 to 50 μm. The composite solid electrolyte membrane is a thin film composed of an inorganic solid electrolyte and a polymer matrix prepared by casting on a surface-treated substrate. , wherein the content of the inorganic solid electrolyte is 5-30wt%, the inorganic solid electrolyte is the ceramic nano-particles of the oxide-based solid electrolyte modified by the binder, the polymer matrix is ​​composed of the polymer-based electrolyte and lithium salt, and the ceramic nano-particles are It is added as an inorganic filler into a polymer matrix to obtain a composite solid electrolyte material. The oxide solid electrolyte is Li 1.4 Al 0.4 Ti 1.6 (PO 4) 3 , Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , Li 0.24 La 0.587 TiO 3 , Li 0.33 La 0.557 TiO ...

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Abstract

The invention discloses an ultrathin composite solid-state electrolyte membrane and a preparation method thereof. The ultrathin composite solid-state electrolyte membrane is a membrane formed by compounding an inorganic solid-state electrolyte filler and a polymer matrix. According to the invention, an adhesive is introduced into a composite system, and the membrane material of the composite solid-state electrolyte is prepared on the substrate attached with the silicone oil on the surface by adopting the tape casting method, and has the advantages of easiness in demolding, extremely small thickness, uniform and compact components, flat and smooth surface and the like. The electrochemical performance is better, and particularly, the ionic conductivity of the membrane is obviously improved. Meanwhile, the inorganic filler and the polymer matrix are tightly combined by the adhesive, so that the mechanical property of the film is remarkably improved, the growth of dendritic crystals can be effectively inhibited, and the safety of a solid-state battery is ensured.

Description

technical field [0001] The invention relates to an electrolyte membrane and its preparation, in particular to an ultra-thin composite solid electrolyte membrane and its preparation method. Background technique [0002] With the continuous development of human society, higher demands are placed on energy storage systems. Compared with lithium-ion batteries with traditional liquid electrolytes, all-solid-state lithium-ion batteries based on solid electrolytes have higher energy density and safety, and are the most promising battery system in the field of energy storage in the future. There are many types of solid-state electrolytes, mainly including three major systems: sulfides, oxides, and polymers. The former two belong to inorganic solid-state electrolytes. Among them, inorganic solid electrolytes have high ionic conductivity (10 -4 ~10 -2 S / cm) and mechanical strength, but there are disadvantages such as air instability, large grain boundary impedance, and poor interfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/056H01M10/0525H01M2300/0065Y02E60/10
Inventor 孙正明李凯于跟喜孙硕汪亚萍
Owner SOUTHEAST UNIV
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