Solid electrolyte and preparation method thereof, solid battery and electronic equipment

A solid electrolyte and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems affecting battery energy density, reduce ionic conductivity, and mechanical strength lithium metal compatibility issues, and achieve excellent charge and discharge characteristics, good electrochemical stability, The effect of good cycle performance

Inactive Publication Date: 2019-10-15
BEIJING INST OF COLLABORATIVE INNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the ceramic-based composite solid-state electrolyte prepared by mixing ceramic powder and organic polymer filler has obtained flexibility to a certain extent and improved the contact interface between the electrolyte and the lithium negative electrode, but the ionic conductivity has decreased significantly. , the particles are easy to agglomerate and hinder the transmission of lithium ions; the ceramic-based composite solid-state electrolyte prepared by using the method of modifying the interface with lithium-conducting organic substances on the surface of the inorganic ceramic sheet, although it takes advantage of the ionic conductivity of the inorganic electrolyte, it is also optimized to a certain extent. The interface performance is improved, but the electrolyte is thick, brittle, and not flexible. At the same time, the organic lithium-conducting interface layer will reduce the overall ionic conductivity and affect the overall energy density of the battery.
[0003] Patent documents CN109075384A, CN107394255A, CN103151557A, CN108963327A and CN106935903A all use inorganic materials as fillers, or prepare poly

Method used

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  • Solid electrolyte and preparation method thereof, solid battery and electronic equipment
  • Solid electrolyte and preparation method thereof, solid battery and electronic equipment

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0064] According to the second aspect of the present invention, an embodiment of the present invention provides a preparation method of a flexible ceramic matrix composite solid electrolyte, comprising the following steps:

[0065] S1. Preparation of Inorganic Solid Electrolyte Ceramic Matrix

[0066] Mix materials containing inorganic solid electrolyte and binder; grind for 1-4 hours; apply 0.1Mpa-10MPa pressure;

[0067] S2, filled with organic additives and lithium salts with lithium-conducting ability

[0068] Mixing the organic additive with lithium-conducting ability and lithium salt; preparing the mixture containing the organic additive with lithium-conducting ability and lithium salt into a liquid mixture; and immersing the inorganic solid electrolyte ceramic matrix obtained in step S1 into the liquid mixture.

[0069] The preparation of the mixture containing the organic additive with lithium-conducting ability and lithium salt into a liquid mixture, for example, is:...

Example Embodiment

[0071] Example 1

[0072] S1. Preparation of ceramic matrix

[0073] The binder polytetrafluoroethylene (PTFE) and the inorganic solid electrolyte Li were combined in an argon glove box. 7 La 3 Zr 2 O 12 (LLZO) was thoroughly mixed in a mass ratio of 5:95, and ground for 1 hour to obtain a rough ceramic substrate film. The particle size of the ground material ranged from 0.1 μm to 10 μm; The film blank was provided with a pressure of 3 MPa, and the pressure was maintained for 30 minutes to obtain a uniform ceramic matrix film.

[0074] S2, filled with organic additives and lithium salts with lithium-conducting ability

[0075] The organic additive succinonitrile (SN) with lithium-conducting ability is mixed with lithium salt LiTFSI in a mass ratio of 4:1, and then the mixture is heated to 80 ° C and melted into a liquid state to form a liquid mixture; the ceramic matrix obtained in step S1 is immersed in the above-mentioned In the liquid mixture for 48 hours, it is tak...

Example Embodiment

[0078] Example 2

[0079] S1. Preparation of ceramic matrix

[0080] The binder polytetrafluoroethylene (PTFE) and the inorganic solid electrolyte Li were combined in an argon glove box. 10 GeP 2 S 12 After fully mixing with a mass ratio of 5:90, grind for 1 hour to obtain a rough ceramic substrate film, and the particle size of the ground material ranges from 0.1 μm to 10 μm; A pressure of 1 MPa was provided, and the pressure was maintained for 30 minutes to obtain a uniform ceramic matrix membrane.

[0081] S2, filled with organic additives and lithium salts with lithium-conducting ability

[0082] The organic additive 1,2-diethyl-3-methylimidazolium trifluoromethanesulfonate (C 7 H 11 F 3 N 2 O 3 S) mix with lithium salt LiFSI in a mass ratio of 5:1, the organic additive dissolves LiFSI to form a solution; the ceramic matrix obtained in step S1 is immersed in the above solution for 48 hours, taken out, and left to stand to remove residues to obtain a flexible cer...

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Abstract

The embodiment of the invention relates to a flexible ceramic matrix composite solid electrolyte and a preparation method thereof, a solid battery and electronic equipment. The flexible ceramic matrixcomposite solid electrolyte comprises an inorganic solid electrolyte ceramic matrix and an organic additive having a lithium conducing capability and lithium salt. The inorganic solid electrolyte ceramic matrix is prepared by utilizing a material containing an inorganic solid electrolyte and a binder by adopting a dry method; the organic additive with the lithium conducting capability and the lithium salt are filled in the inorganic solid electrolyte ceramic matrix. The flexible ceramic matrix composite solid electrolyte has good flexibility, high ionic conductivity, good electrochemical stability and good interface stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a flexible ceramic-based composite solid electrolyte and a preparation method thereof, a flexible solid-state battery and electronic equipment. Background technique [0002] Ceramic-based composite electrolytes are currently a hot spot in the development of solid-state batteries. In the prior art, the ceramic-based composite solid-state electrolyte prepared by mixing ceramic powder and organic polymer filler has obtained flexibility to a certain extent and improved the contact interface between the electrolyte and the lithium negative electrode, but the ionic conductivity has decreased significantly. , the particles are easy to agglomerate and hinder the transmission of lithium ions; the ceramic-based composite solid-state electrolyte prepared by using the method of modifying the interface with lithium-conducting organic substances on the surface of the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0564H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0564H01M10/0565H01M2300/0065H01M2300/0091Y02E60/10
Inventor 范丽珍蒋涛立陈龙
Owner BEIJING INST OF COLLABORATIVE INNOVATION
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