Solid electrolyte and preparation method and application thereof

Abstract

The invention discloses a solid electrolyte and a preparation method and application thereof, and the solid electrolyte contains a membrane material and electrolyte salt, wherein an organic phase comprises a three-dimensional communicated interface, the specific area of the organic phase is greater than or equal to 1 * 10<4> cm2 / cm3, and the electrolyte salt is dissolved in the organic phase. Thepreparation method of the solid electrolyte comprises the following steps: spraying the solution of a high polymer material to a selected receiving surface by adopting an electrostatic spinning technology to form a continuous three-dimensional structure, selectively and simultaneously spraying dispersion liquid of inorganic particles to the selected receiving surface by adopting the electrostaticspraying technology, and then carrying out pressurizing treatment to obtain a membrane material; and dropwise adding or spraying the solution of the electrolyte salt into the membrane material or impregnating the membrane material into the solution of the electrolyte salt. The room-temperature conductivity of the solid electrolyte reaches up to 10<-3> S / cm, and the method does not depend on the addition of a special polymer or filler. The solid electrolyte has the advantages of simple preparation, low cost, wide raw material source and the like.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a solid electrolyte, a preparation method thereof and an electrochemical device containing the solid electrolyte. Background technique [0002] In the past 20 years, with the rapid development of the portable consumer electronics industry, lithium-ion batteries have achieved great commercial success due to their high energy density, good cycle performance and rate performance. However, the continuous occurrence of lithium-ion battery safety accidents in the past few decades has always been a hidden concern in the field. [0003] Lithium-ion batteries may cause fire and explosion hazards due to internal short-circuit or other reasons that cause excessive internal temperature of the battery. The main reason is that high-temperature and flammable organic electrolytes are used as lithium-ion conductive networks. Therefore, once the internal temperature of the battery reac...

AI Technical Summary

Problems solved by technology

Up to now, the ionic conductivity of most improved polymer solid electrolytes can only reach 10 -5 S / cm, there are a few reported programs that can reach 10 -4 S / cm (such as the polymer electrolyte disclosed in CN102780032A embodiment 2, 3), rare room temperature ion conductivity can reach 10 -3 S / cm Polymer Solid Electrolyte Report

In addition, it has been reported that the ionic conductivity can reach 10 -4 Polymer solid electrolytes above S / cm generally need to rely on the use of specific materials and / or expensive materials

For example, the ionic conductivity of the polymer electrolyte disclosed in CN102780032A embodiment 2 and 3 can reach 10 -4 S / cm, but it must add specific anatase titanium oxide

The ionic conductivity of the electrolyte membrane disclosed in CN107492680A embodiment 1 can reach 10 -4 S / cm, but it must use a specific polymer

There are also some polymer electrolytes that must add expensive fast ion conductors in order to obtain higher ionic conductivity

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