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Solid electrolyte interface modification film for lithium battery and preparation method thereof

A solid electrolyte and interface modification technology, applied in hybrid batteries, battery pack components, hybrid battery components, etc., can solve the problem of reducing the discharge current and discharge power of lithium-air batteries, large ion transmission impedance, and reducing battery discharge performance, etc. problems, to achieve the effects of easy large-area preparation, obvious performance improvement, and improved discharge performance

Active Publication Date: 2015-08-12
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large ion transport resistance of the solid electrolyte as a separator, coupled with the impedance of the interface between the solid electrolyte and the lithium electrode area and the air electrode area, the discharge current and discharge power of the lithium-air battery are reduced, thereby reducing the discharge of the battery. performance

Method used

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  • Solid electrolyte interface modification film for lithium battery and preparation method thereof
  • Solid electrolyte interface modification film for lithium battery and preparation method thereof
  • Solid electrolyte interface modification film for lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, lithium titanium aluminum phosphate was selected as the solid electrolyte, and the interface modification film was prepared by magnetron sputtering.

[0025] The preparation steps of the solid electrolyte interface modification membrane:

[0026] (1) Lithium titanate with a mass ratio of 15:1 is selected as the lithium ion active material and mixed evenly with water;

[0027] (2) Put the lithium titanate mixed with water in step (1) into a steel mold and press it into a cylinder as a target material, place the target material in a sintering furnace, sinter at 800°C for 8 hours, and cool naturally with the furnace;

[0028] (3) Place the sintered and cooled target in step (2) in a magnetron sputtering apparatus, fill the magnetron sputtering apparatus with argon gas, and perform magnetron sputtering on one side of the solid electrolyte; modify the interface of the solid electrolyte according to the battery model According to the needs of film thickness,...

Embodiment 2

[0030] In this example, lithium silicon phosphorus sulfur was selected as the solid electrolyte, and the interface modification film was prepared by laser evaporation.

[0031] The preparation steps of the solid electrolyte interface modification membrane:

[0032] (1) and (2) are identical with step (1) and (2) among the embodiment 1;

[0033] (3) To place the sintered and cooled target in step (2) in a laser evaporator, and fill the laser evaporator with an argon-oxygen mixed gas with a volume ratio of oxygen content of 10%, and perform laser evaporation on one side of the solid electrolyte; according to the battery model To meet the needs of solid electrolyte interface modification film thickness, adjust the power, temperature and laser evaporation time of the target at any time. The adjustment range is: power 200-500W, radiation temperature 10-200℃, laser evaporation time 2-10 hours, solid A layer of lithium ion active material with a thickness of 0.01-10 μm will be attac...

Embodiment 3

[0035] In this example, lithium phosphorus oxynitride was selected as the solid electrolyte, and the interface modification film was prepared by laser evaporation.

[0036] The preparation steps of the solid electrolyte interface modification membrane:

[0037] (1) and (2) are identical with step (1) and (2) among the embodiment 1;

[0038](3) Place the sintered and cooled target in step (2) in an electron beam evaporator, fill the electron beam evaporator with an argon-oxygen mixed gas with an oxygen content of 10% by volume, and perform electron beam evaporation on one side of the solid electrolyte; According to the needs of the battery model for the thickness of the solid electrolyte interface modification film, the power, temperature and electron beam evaporation time of the target can be adjusted at any time. The adjustment range is: power 200-400W, radiation temperature 10-100°C, electron beam evaporation time 2 -10 hours, a layer of lithium ion active material with a t...

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Abstract

The invention relates to an interfacial modification membrane for a solid electrolyte for a lithium battery and a preparation method thereof. The interfacial modification membrane for the solid electrolyte for the lithium battery is characterized in that a layer of interfacial modification membrane is attached to one face or both faces of a solid electrolyte. The preparation method of the interfacial modification membrane comprises the following steps of: (1) selecting a fast-ionic conductor or a uniform mixture of a lithium-ion active material and water; (2) forming a target material by compressing the fast-ionic conductor or the uniform mixture, sintering the target material for 3-24 hours at the temperature of 500-1200 DEG C, and then, carrying out natural cooling with a furnace; and (3) attaching the target material to the face or the both faces of the solid electrolyte through magnetron sputtering, laser evaporation or electron beam evaporation, thereby obtaining the interfacial modification membrane for the solid electrolyte. According to the interfacial modification membrane for the solid electrolyte for the lithium battery and the preparation method thereof, as the layer of interfacial modification membrane is attached to the face / faces of the solid electrolyte playing a diaphragm role, the interfacial impedance between the solid electrolyte and an electrolytic solution and other types of electrolytes is reduced, the ion transmission capacity of an interface layer of the solid electrolyte is improved, and the discharge performance of the battery is effectively improved; and the preparation method is simple, and the large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a solid electrolyte interface modification film for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-air battery is a new type of battery, including metal lithium electrode, air electrode and solid electrolyte. As a battery with extremely high specific energy, lithium-air battery has a theoretical energy density close to that of gasoline. [0003] At present, the structure of lithium-air batteries generally uses a solid electrolyte as a separator to separate the lithium electrode and the air electrode in the battery case into two regions, so that the lithium electrode is isolated from the air electrode. An electrolyte (lithium ion electrolyte or solid electrolyte) is added to the lithium electrode area, and an aqueous electrolyte is added to the air electrode area. The solid electrolyte blocks the transfer of water and oxygen i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M12/02H01M12/00
CPCY02E60/10
Inventor 杨同欢桑林刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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