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Solid electrolyte film, and preparation method and application of solid electrolyte film

A technology of solid-state electrolyte membrane and solid-state electrolyte, which is applied in electrolytes, fuel cell half-cells, primary battery-type half-cells, circuits, etc., can solve problems such as poor performance and high internal resistance of lithium-air batteries, and achieve internal resistance low effect

Active Publication Date: 2014-10-15
南京同宁新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a solid electrolyte membrane, its preparation method and application, the purpose of which is to provide a kind of membrane with good ion conductivity and mechanical A solid electrolyte membrane with sufficient strength is applied to the preparation of lithium-air batteries, thereby solving the contradiction between the ion conductivity and mechanical strength of the existing solid electrolyte membranes, and applied to the technical problems of high internal resistance and poor performance in the preparation of lithium-air batteries

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  • Solid electrolyte film, and preparation method and application of solid electrolyte film
  • Solid electrolyte film, and preparation method and application of solid electrolyte film

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preparation example Construction

[0028] The solid electrolyte membrane provided by the invention, its preparation method, comprises the following steps:

[0029] (1) Preparation of solid electrolyte precursor: according to the element ratio of the target solid electrolyte, the raw materials of the corresponding elements are evenly dispersed in the organic solvent, and the powder obtained by drying the raw materials is uniformly mixed, and the powder is heated at 500°C to 700°C The solid electrolyte precursor powder is obtained by sintering; the raw materials are oxides, carbonate compounds and / or phosphate compounds of corresponding elements; the organic solvent is preferably absolute ethanol.

[0030](2) Preparation of solid electrolyte target material: the solid electrolyte precursor powder prepared in step (1) is added with 1% to 10% of its mass binder, the binder is preferably 1% to 5% by mass fraction The ethanol solution of polyvinyl alcohol or polyvinyl butyral is pressed into a sheet under a press of ...

Embodiment 1

[0038] A solid electrolyte membrane, comprising a solid electrolyte layer and a porous ceramic layer, the thickness of the solid electrolyte layer is 1.8 microns, and the bending strength of the porous ceramic layer is 100N / mm 2 , and its Li-ion conductivity is 6.0×10 -5 Siemens / cm, the thickness of the porous ceramic layer is 170 microns, and the solid electrolyte layer evenly covers the porous ceramic layer.

[0039] The material of the solid electrolyte layer is a perovskite lithium ion conductor Li 3x La (2 / 3)-x TiO 3 (x=0.1, i.e. Li 0.3 La 0.57 TiO 3 , hereinafter referred to as LLTO).

[0040] The porous ceramic layer is double-pass anodized aluminum.

[0041] The solid electrolyte membrane, its preparation method, comprises the following steps:

[0042] (1) Preparation of solid electrolyte precursor: according to the chemical formula Li 3x La (2 / 3)-x TiO 3 (x=0.1) (ie Li 0.3 La 0.57 TiO 3 ) in the stoichiometric ratio of Li, La, Ti 0.3:0.57:1, choose Li 2...

Embodiment 2

[0050] A solid electrolyte membrane, comprising a solid electrolyte layer and a porous ceramic layer, the thickness of the solid electrolyte layer is 1 micron, and the bending strength of the porous ceramic layer is 100N / mm 2 , and its Li-ion conductivity is 1.2×10 -6 Siemens / cm, the thickness of the porous ceramic layer is 170 microns, and the solid electrolyte layer evenly covers the porous ceramic layer.

[0051] The material of the solid electrolyte layer is NASICON type lithium ion conductor Li 1+y Ge 2-x-y Ti x Al y (PO 4 ) 3 (wherein x=0.3, y=0.21, promptly Li 1.21 Ge 1.49 Al 0.21 Ti 0.3 (PO 4 ) 3 , hereinafter referred to as LGATP).

[0052] The porous ceramic layer is double-pass anodized aluminum.

[0053] The solid electrolyte membrane, its preparation method, comprises the following steps:

[0054] (1) Preparation of solid electrolyte precursor: according to the chemical formula Li 1.21 Ge 1.49 Al 0.21 Ti 0.3 (PO 4 ) 3 Medium Li, Ge, Al, Ti, PO ...

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Abstract

The invention discloses a solid electrolyte film, and a preparation method and an application of the solid electrolyte film. The solid electrolyte film comprises a solid electrolyte layer and a porous ceramic layer, wherein the thickness of the solid electrolyte layer is 0.5-10 micrometers; the thickness of the porous ceramic layer is 100-300 micrometers; and the solid electrolyte layer uniformly covers the porous ceramic layer. The preparation method of the solid electrolyte film comprises the following steps of (1) preparing a solid electrolyte precursor: sintering raw material powder at 500-700 DEG C, (2) preparing a solid electrolyte target material: adding the powder to a binding agent, pressing the binding agent into sheets and sintering, and (3) applying the solid electrolyte film on a porous ceramic substrate: uniformly applying the solid electrolyte film on porous ceramic by a magnetron sputtering method. The solid electrolyte film has good ionic conduction properties and mechanical properties, is applied to preparation of a lithium air battery, and is low in internal resistance and good in electrical performance. The method is simple in technology and low in cost.

Description

technical field [0001] The invention belongs to the field of solid electrolytes, and more specifically relates to a solid electrolyte membrane and its application. Background technique [0002] With the rapid development of electric vehicles, traditional lithium-ion batteries have been difficult to meet the high energy density requirements of electric vehicles, and there is an urgent need to develop a battery system with higher energy density. Lithium-air batteries have attracted widespread attention because of their ultra-high specific capacity and energy density. Its theoretical energy density is as high as 11430Wh / kg (excluding oxygen). object battery. Oxygen, the active material of the positive electrode, comes from the air and can be directly obtained from the environment without being stored inside the battery. Compared with lithium-ion batteries, it has a higher energy density, and has become a research and development hotspot worldwide in recent years. [0003] Lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06
CPCH01M12/08H01M2300/0071
Inventor 沈越张旺黄云辉
Owner 南京同宁新材料研究院有限公司
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