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Solid-state electrolyte with negative electrode interface layer, preparation method and solid-state battery

A solid-state electrolyte and solid-state battery technology, which is applied in the direction of non-aqueous electrolyte batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of high energy consumption, complex process, and poor compatibility of lithium metal in the negative electrode, and achieve low energy consumption and high production efficiency. The process is simple and the effect of reducing the negative electrode interface resistance

Active Publication Date: 2021-11-19
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the poor compatibility of the current solid electrolyte with the lithium metal of the negative electrode, and the problems of high energy consumption and complicated process when modifying it, the present invention provides a solid electrolyte with a negative electrode interface layer and a preparation method thereof

Method used

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  • Solid-state electrolyte with negative electrode interface layer, preparation method and solid-state battery
  • Solid-state electrolyte with negative electrode interface layer, preparation method and solid-state battery
  • Solid-state electrolyte with negative electrode interface layer, preparation method and solid-state battery

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preparation example Construction

[0038] The preparation method comprises the following steps:

[0039] Deposit the indium gallium tin liquid metal alloy on the surface of the polished solid electrolyte, and after leveling, the indium gallium tin liquid metal alloy forms an indium gallium tin liquid metal alloy layer on the surface of the solid electrolyte to obtain a solid electrolyte with a negative interface layer .

[0040] Among them, the indium gallium tin liquid metal alloy can be prepared by the following method, mixing indium, gallium, and tin with a purity of not less than 98% according to the required mass ratio to obtain a mixed material of indium gallium tin, and then heating the mixed material to (1100-1300)°C, keep warm for (30-120) min to obtain the indium-gallium-tin liquid metal alloy, and then naturally cool to room temperature for use. The specific adding temperature can be 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, etc.

[0041] Preferably, according to the mass ratio, the mass ratio of gal...

Embodiment 1

[0047] A solid-state electrolyte with a negative electrode interface layer, a preparation method thereof, and a solid-state battery. Wherein the preparation method of the solid state electrolyte with negative interface layer comprises the following steps:

[0048] S11. Use 2000-grit sandpaper to polish the garnet oxide solid electrolyte as the substrate to a thickness of 800 μm, and use an automatic polishing machine with a cotton self-adsorption abrasive disc to mechanically polish the surface.

[0049] S12. According to the three metals of indium, gallium and tin, according to the mass ratio of 2:8.8:1, weigh 2g of indium with a purity of not less than 98%, 8.8g of gallium with a purity of not less than 98%, and Tin 1.0g, after mixing the three, heat at 1200°C for 60min to obtain an indium-gallium-tin liquid metal alloy, which remains liquid when cooled to room temperature.

[0050] S13. Take 1 μL indium gallium tin liquid metal alloy, drop it on the polished surface of the...

Embodiment 2

[0054] A solid-state electrolyte with a negative electrode interface layer, a preparation method thereof, and a solid-state battery. Wherein the preparation method of the solid state electrolyte with negative interface layer comprises the following steps:

[0055] S21. Use 2000-grit sandpaper to grind the garnet oxide solid electrolyte as the substrate to a thickness of 800 μm and polish the surface.

[0056] S22. According to the three metals of indium, gallium and tin, according to the mass ratio of 2:8.8:1, weigh 2g of indium with a purity of not less than 98%, 8.8g of gallium with a purity of not less than 98%, and Tin 1.0g, after mixing the three, heat at 1200°C for 60min to obtain an indium-gallium-tin liquid metal alloy, which remains liquid when cooled to room temperature.

[0057] S23. Take 1 μL indium gallium tin liquid metal alloy, drop it on the polished surface of the garnet oxide solid electrolyte disc with a diameter of 15mm as the substrate, and use a scraper ...

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Abstract

The invention relates to the technical field of solid-state batteries, and in particular provides a solid-state electrolyte with a negative electrode interface layer, a preparation method and a solid-state battery. The solid electrolyte is any one of a garnet-structure solid-state electrolyte, a NASICON-structure solid-state electrolyte, an organic polymer solid-state electrolyte, an anti-perovskite solid-state electrolyte, and a sulfide solid-state electrolyte, and a layer of indium gallium tin is laminated on the surface of the solid electrolyte. Liquid metal alloy layer. Since the surface of the solid electrolyte of the present invention has a layer of liquid metal alloy layer, after the solid state battery is assembled, the liquid metal alloy layer and the lithium metal negative electrode are positively opposite, and the transition effect of the liquid metal alloy layer can improve the lithium metal negative electrode and the solid electrolyte material. The solid-solid compatibility between the interfaces reduces the interface resistance, and at the same time, the liquid metal alloy layer can inhibit the growth of lithium dendrites at the negative interface, which is beneficial to improve the electrochemical performance of solid-state batteries.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to a solid-state electrolyte with a negative interface layer, a preparation method and a solid-state battery. Background technique [0002] Solid-state batteries based on solid-state electrolytes have great potential application prospects due to their high energy density and high safety. Common solid electrolyte materials are: (1) NASICON (NaSuper-ionic Conductor) structure, such as NaZr 2 P 3 o 12 、Na 1+x Zr 2 Si 2 PO 12 , Li 1+x Al x Ti 2-x (PO4) 3 (LATP), Li 1+x Al x Ge 2-x (PO 4 ) 3 (LAGP); (2) perovskite structure oxides, such as Li 3x La 2 / 3-x TiO 3 ; (3) garnet structure oxides, such as Li x La 3 m 2 o 12 (x=3~7); (4) anti-perovskite structure Li 3 OX 3 , Thin-film solid electrolyte LiPON and sulfide glass or glass-ceramic electrolyte; (5) polymer electrolyte. [0003] However, these solid-state electrolytes have the problem ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0562H01M10/052
CPCH01M10/052H01M10/056H01M10/0562H01M2300/0065H01M2300/0068Y02E60/10
Inventor 邓永红张田韩兵
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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