Flexible composite solid-state electrolyte, full-solid-state lithium-ion battery and preparation method thereof

A solid-state electrolyte, lithium-ion battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problem of unfavorable dispersion uniformity of sulfide electrolyte and polymer electrolyte, inability to form flexible solid electrolyte, restricting flexibility It can improve the conductivity and electrochemical stability of lithium ions, improve the cycle life and energy density, and achieve the effect of good electrochemical stability.

Active Publication Date: 2019-08-02
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic conductivity of the composite solid electrolyte prepared by the above method is still relatively low at room temperature, and the preparation process generally adopts a dry grinding mixing method, which does not take advantage of the dispersion uniformity of the sulfide electrolyte and the polymer electrolyte, which also restricts its flexibility. Sexual development, but unable to form a flexible solid electrolyte

Method used

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  • Flexible composite solid-state electrolyte, full-solid-state lithium-ion battery and preparation method thereof
  • Flexible composite solid-state electrolyte, full-solid-state lithium-ion battery and preparation method thereof
  • Flexible composite solid-state electrolyte, full-solid-state lithium-ion battery and preparation method thereof

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Experimental program
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preparation example Construction

[0051] The preparation method of the flexible composite solid electrolyte comprises the following steps:

[0052] Grinding the mixture of sulfide solid electrolyte and its modification, thermoplastic polymer and its modification and lithium salt.

[0053] In some preferred embodiments of the present invention, the grinding is wet grinding, including ball milling, sand milling or wet milling.

[0054] In some preferred embodiments of the present invention, the grinding solvent used in the wet grinding includes acetonitrile, N-methylpyrrolidone, dimethoxyethane, tetrahydrofuran, ethyl acetate, dimethyl carbonate, dimethyl ethyl One or a combination of amides, ethyl propionate, N-methylformamide, dimethylformamide, acetone, ethanol and toluene.

[0055] In some preferred embodiments of the present invention, the mass of the grinding solvent is 2 to 8 times the mass sum of the sulfide solid electrolyte and its modified product, the thermoplastic polymer and its modified product, ...

Embodiment 1

[0071] As a specific solution of the present invention, the flexible composite solid electrolyte of this embodiment includes crystalline Li 10 GeP 2 S 12 , thermoplastic polymer PEO (molecular weight 600,000) and lithium salt LiTFSI. The sulfide solid electrolyte is selected from crystalline 5Li 2 S-P 2 S 5 -GeS 2 , namely Li 10 GeP2 S 12 ; The thermoplastic polymer is selected from PEO; the lithium salt is selected from LiTFSI; the organic solvent is selected from ACN.

[0072] The preparation process of the flexible composite solid electrolyte in this example is as follows:

[0073] Crystalline Li 10 GeP 2 S 12 , PEO (molecular weight: 600,000), and LiTFSI are mixed, added to ACN solvent and mixed by high-energy ball milling. Among them, Li 10 GeP 2 S 12 The proportion of solid electrolyte is 80wt%, the proportion of PEO polymer and LiTFSI lithium salt is 20wt%; the molar ratio of polymer monomer and lithium ion in lithium salt is 18:1; the mass of ACN organic...

experiment example 1

[0079] Experimental example 1 Flexible display and ionic conductivity test of flexible composite solid electrolyte

[0080] Coat the flexible composite solid electrolyte slurry on a glass plate, and after drying naturally, place the glass plate in a muffle furnace for drying at 50°C, and then remove the prepared flexible composite solid electrolyte from the glass plate, Obtain flexible composite solid electrolyte PEO-LiTFSI-80wt%LGPS (LGPS is the abbreviation of flexible composite solid electrolyte) (see figure 1 middle e and f). Comparative polymer solid electrolyte PEO-LiTFSI (see figure 1 In a and b), the flexible composite solid electrolyte can also be bent and folded.

[0081] Use a slicer to obtain a disc-shaped flexible composite solid electrolyte PEO-LiTFSI-80wt% LGPS with a diameter of 12 mm and a thickness of 164 μm. Add a stainless steel sheet to each side of the disc-shaped flexible composite solid electrolyte and place it in the self-assembled test In the abras...

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Abstract

The invention provides a flexible composite solid-state electrolyte, a full-solid-state lithium-ion battery and a preparation method thereof. The solid-phase mixing of a sulfide solid-state electrolyte or a modifier thereof, a thermoplastic polymer or a modifier thereof and lithium salt enables the composite solid-state electrolyte to have good flexibility while improving the dispersion uniformityand effective contact of each component. A halide, phosphate and / or an oxide are added to the sulfide material especially before the composition of the sulfide solid-state electrolyte and the polymersolid-state electrolyte, thereby providing a multi-dimensional channel for lithium ion transmission, increasing the disordered degree of lithium ion distribution, and being capable of further improving the lithium ion conductivity and electrochemical stability of the composite solid-state electrolyte. The flexible composite electrolyte has the advantages of high lithium conductivity at the room temperature, good electrochemical stability, easy preparation and processing, ability of being bent and cut and the like. The formed flexile full-solid-state battery has good mechanical performance andbending performance, and improves the cycle life and energy density.

Description

technical field [0001] The invention belongs to the technical field of energy storage and conversion, and relates to a flexible composite solid-state electrolyte, an all-solid-state lithium ion battery and a preparation method thereof, in particular to an application of a flexible composite solid-state electrolyte in a flexible all-solid-state battery. Background technique [0002] Traditional lithium-ion batteries usually use liquid organic electrolytes and separators. However, organic electrolytes are volatile, flammable, and leaking, which leads to serious safety hazards in lithium-ion batteries. At present, researchers are actively developing all-solid-state batteries, that is, using solid-state electrolytes instead of organic electrolytes to prepare all-solid-state batteries. The main scientific and technical problems that all-solid-state batteries need to solve include how to improve the lithium ion conductivity and electrochemical stability of solid electrolyte materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0565H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 张辉郝诗梦
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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