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Sulfide solid electrolyte material with high stability to lithium, preparation method and application thereof

A solid electrolyte, solid electrolyte technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of battery capacity reduction, chemical instability, service life attenuation, etc., achieve high air stability, improve ionic The effect of conductivity and long stabilization time

Active Publication Date: 2020-06-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfide solid electrolyte has the disadvantage of chemical instability, and it is easy to react with lithium metal during the cycle, which will lead to a decrease in battery capacity and a rapid decline in service life.

Method used

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  • Sulfide solid electrolyte material with high stability to lithium, preparation method and application thereof
  • Sulfide solid electrolyte material with high stability to lithium, preparation method and application thereof
  • Sulfide solid electrolyte material with high stability to lithium, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) The present embodiment provides a kind of sulfide solid state electrolyte, and its chemical composition is Li 7 Nb 0.12 P 2.88 S 10.7 o 0.3 , can also be written as a chemical composition of 7Li 2 S 2.88P 2 S 5 0.12Nb 2 o 5 ;

[0038] (2) will Li 2 S, P 2 S 5 and dopant Nb 2 o 5 Mixed according to the molar ratio of 7:2.88:0.12, put into a stainless steel grinding tank protected by argon, the rotating speed of ball milling is 500rpm, and the ball milling time is 30h to obtain the initial solid electrolyte material;

[0039] (3) Put the initial solid electrolyte material obtained in step (2) into a quartz test tube, seal it, and then heat treat it at 250°C for 1 hour, and then grind it into powder to obtain the sulfide solid electrolyte material Li 7 Nb 0.12 P 2.88 S 10.7 o 0.3 (That is, a sulfide solid-state electrolyte material with high stability to lithium).

[0040] (4) Put Li first 2 S and LiI were placed in a ball mill jar and mechanically ...

Embodiment 2

[0048] (1) The present embodiment provides a kind of sulfide solid state electrolyte, and its chemical composition is Li 7 Nb 0.5 P 2.5 S 9.75 o 1.25 , can also be written as a chemical composition of 7Li 2 S 2.5P 2 S 5 0.5Nb 2 o 5 ;

[0049] (2) will Li 2 S, P 2 S 5 and dopant Nb 2 o 5 Mix according to the molar ratio of 7:2.5:0.5, put it into an argon-protected stainless steel grinding tank, the ball milling speed is 550rpm, and the ball milling time is 40h to obtain the initial solid electrolyte material;

[0050] (3) Put the initial solid electrolyte material obtained in step (2) into a quartz test tube, seal it, and then heat treat it at 240°C for 2 hours, and then grind it into powder to obtain the sulfide solid electrolyte material Li 7 Nb 0.5 P 2.5 S 9.75 o 1.25 .

[0051] (4) Put Li first 2 S and LiI were placed in a ball milling tank and mechanically milled for 15 hours under an argon atmosphere, with a rotational speed set at 500 rpm; 7 Nb 0.5 ...

Embodiment 3

[0054] (1) The present embodiment provides a kind of sulfide solid state electrolyte, and its chemical composition is Li 7 W 0.5 P 2.5 S 9.75 o 1.5 , can also be written as a chemical composition of 7Li 2 S 2.5P 2 S 5 ·1WO 3 ;

[0055] (2) will Li 2 S, P 2 S 5 and dopant WO 3 Mix according to the molar ratio of 7:2.5:1, put it into an argon-protected stainless steel grinding tank, the ball milling speed is 450rpm, and the ball milling time is 40h to obtain the initial solid electrolyte material;

[0056] (3) Put the initial solid electrolyte material obtained in step (2) into a quartz test tube, seal it, and then heat treat it at 250°C for 2 hours, and then grind it into powder to obtain the sulfide solid electrolyte material Li 7 W 0.5 P 2.5 S 9.75 o 1.5 .

[0057] (4) Put Li first 2 S and LiI were placed in a ball mill jar and mechanically milled for 15 hours under an argon atmosphere, with a rotational speed set at 550 rpm; 7 W 0.5 P 2.5 S 9.75 o 1.5 ...

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Abstract

The invention discloses a sulfide solid electrolyte material with high stability to lithium, a preparation method thereof. A chemical composition is 7Li2S. XP2S5. YMmOn, x is greater than 0, y is greater than 0, m is greater than 0, n is greater than 0, and M is a metal element. The preparation method comprises the following steps: mixing and ball-milling Li2S, P2S5 and MmOn to obtain an initial solid electrolyte material; and putting the obtained initial solid electrolyte material into a quartz test tube, sealing, carrying out heat treatment, and grinding into powder in an inert gas atmosphere to obtain the sulfide solid electrolyte material with high stability to lithium. The electrolyte also has the advantages of high air stability, good stability to lithium metal, wide electrochemicalwindow and the like, and the all-solid-state lithium battery assembled by the solid electrolyte material has the characteristics of high charge-discharge specific capacity, high safety, excellent cycle stability and the like.

Description

technical field [0001] The invention relates to the technical field of solid-state electrolyte materials for lithium-ion batteries, in particular to a novel sulfide solid-state electrolyte material with high stability to lithium, a preparation method thereof, and an application of solid-state lithium batteries. Background technique [0002] With the continuous improvement of people's living standards, the increasing popularity of digital electronic equipment and emerging electric vehicles, people have put forward higher requirements for energy storage equipment, and lithium-ion batteries have high energy density, excellent cycle stability and no memory. Utility and other advantages are being applied on a large scale. However, traditional liquid lithium-ion batteries contain a large amount of flammable and volatile organic electrolytes, which can easily cause safety problems such as fires under the conditions of overcharge, overdischarge, and high temperature. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/052H01M10/0525C01B25/26
CPCH01M10/0562H01M10/052H01M10/0525C01B25/26H01M2300/0068C01P2004/03C01P2006/40Y02P70/50
Inventor 王秀丽蒋朝涂江平
Owner ZHEJIANG UNIV
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