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High ion conductivity sulfide solid electrolyte material and its preparation method and application

A solid electrolyte, ionic conductivity technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of capacity decay, shortened cycle life, reduction of positive active material, etc. Low ionic conductivity, the effect of solving the shuttle effect and improving the cycle stability

Active Publication Date: 2019-02-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the shuttle effect causes internal self-discharge of the battery, and on the other hand, the positive active material decreases, which is an important factor causing capacity fading and shortening cycle life.

Method used

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  • High ion conductivity sulfide solid electrolyte material and its preparation method and application
  • High ion conductivity sulfide solid electrolyte material and its preparation method and application
  • High ion conductivity sulfide solid electrolyte material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Will Li 2 S, P 2 S 5 Mixed with dopants MnS and LiI according to the molar ratio of 3.35:1.45:0.1:0.3 and high-energy mechanical ball milling, the speed and time of high-energy mechanical ball milling were 370rpm and 40 hours, so as to obtain the initial solid electrolyte material.

[0047] (2) The solid electrolyte raw material obtained in step (1) is placed in a tube furnace, and heat-treated under an argon atmosphere. The flow rate of argon gas for the reaction was 100 sccm, and the temperature and time of the reaction were 240° C. and 1 hour, respectively.

[0048] (3) Then, by grinding, the solid electrolyte obtained in step (2) is ground into powder, and the grinding is carried out under an inert atmosphere, the water content of the atmosphere is less than 1ppm, and the oxygen content is less than 1ppm. Then use a 200-450 mesh sieve to screen the solid electrolyte powder with a suitable particle size to obtain the MnS and LiI doped high ion conductivity sul...

Embodiment 2

[0053] (1) Will Li 2 S, P 2 S 5 Mixed with dopants MnS and LiI according to the molar ratio of 3.25:1.4:0.2:0.5 and high-energy mechanical ball milling, the speed and time of high-energy mechanical ball milling were 510rpm and 40 hours, so as to obtain the initial solid electrolyte material.

[0054] (2) The solid electrolyte raw material obtained in step (1) is placed in a tube furnace, and heat-treated under an argon atmosphere. The flow rate of argon gas for the reaction was 100 sccm, and the temperature and time of the reaction were 250° C. and 2 hours, respectively.

[0055] (3) Then, by grinding, the solid electrolyte obtained in step (2) is ground into powder, and the grinding is carried out under an inert atmosphere, the water content of the atmosphere is less than 1ppm, and the oxygen content is less than 1ppm. Then use a 200-450 mesh sieve to screen the solid electrolyte powder with a suitable particle size to obtain the MnS and LiI doped high ion conductivity sul...

Embodiment 3

[0059] (1) Will Li 2 S, P 2 S 5 Mixed with dopants MnS and LiI according to the molar ratio of 3.1:1.35:0.3:0.8 and high-energy mechanical ball milling, the speed and time of high-energy mechanical ball milling were 510rpm and 60 hours, so as to obtain the initial solid electrolyte material.

[0060] (2) The solid electrolyte raw material obtained in step (1) is placed in a tube furnace, and heat-treated under an argon atmosphere. The flow rate of argon gas for the reaction was 100 sccm, and the temperature and time of the reaction were 260° C. and 3 hours, respectively.

[0061] (3) Then, by grinding, the solid electrolyte obtained in step (2) is ground into powder, and the grinding is carried out under an inert atmosphere, the water content of the atmosphere is less than 1ppm, and the oxygen content is less than 1ppm. Then use a 200-450 mesh sieve to screen the solid electrolyte powder with a suitable particle size to obtain the MnS and LiI doped high ion conductivity sul...

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Abstract

The invention discloses a high ionic conductivity sulfide solid electrolyte material, and a preparation method and application of the high ionic conductivity sulfide solid electrolyte material in a full-solid lithium-sulfur battery. A chemical composition of the material is Li7P3-xMnxS11-(3x+y) / 2Iy, wherein x is greater than 0 and less than 0.5, and y is greater than 0 and less than 1. The preparation method of the material comprises the following steps: mixing and ball-milling Li2S, P2S5, MnS and LiI to obtain an initial solid electrolyte material; and performing heat treatment for the initial solid electrolyte material under the inert gas, and then grinding into powder to obtain the high ionic conductivity sulfide solid electrolyte material. The lithium-sulfur solid battery is prepared by preparing a composite positive electrode formed by ball milling and uniformly mixing sulfur, conductive carbon black and solid electrolyte, and the positive electrode is used for solving the disadvantages of low electron conductivity rate of the sulfur and low ion conductivity. The prepared lithium-sulfur battery has the advantages of high safety, high energy density and high cycling stability.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte materials for lithium ion batteries, in particular to a high ion conductivity sulfide solid electrolyte material and a preparation method and application thereof. Background technique [0002] With the popularity of portable devices such as mobile phones and computers, people's demand for high-capacity energy storage devices continues to grow, and lithium batteries are currently a chemical power source with high energy density and good cycle stability among rechargeable batteries. Lithium batteries are being used large-scale applications. However, while the organic liquid electrolyte lithium-ion battery is developing into the field of energy storage and mobile electronics, the safety problems presented cannot be ignored. On the one hand, the organic electrolyte is volatile and flammable. When the battery is overcharged, overdischarged, or at high temperature, it will expand and the elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/0562
CPCH01M10/052H01M10/0562H01M2300/0068Y02E60/10
Inventor 涂江平徐若晨夏新辉王秀丽
Owner ZHEJIANG UNIV
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