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Coated sulfide solid electrolyte material and preparation method and application thereof

A solid electrolyte and sulfide technology, which is applied to active material electrodes, circuits, positive electrodes, etc., can solve the problem of reducing the interface compatibility between the sulfide solid electrolyte and the positive electrode material, limiting the coating method and the industrial application of the coating material. , the coating method is cumbersome and other problems, to achieve the effect of significant coating effect, improved interface stability, and low coating cost

Pending Publication Date: 2022-05-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the coating method is cumbersome and requires high cost; on the other hand, the oxide coating layer reduces the interface compatibility between the sulfide solid electrolyte and the positive electrode material, and it is necessary to prepare the positive electrode sheet to match the coating. post electrolyte
Both of these problems have limited the industrial application of the coating means and coating materials.

Method used

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  • Coated sulfide solid electrolyte material and preparation method and application thereof
  • Coated sulfide solid electrolyte material and preparation method and application thereof
  • Coated sulfide solid electrolyte material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) In a glove box with an argon atmosphere, LiSiPSCl sulfide solid electrolyte and LiFSI organic lithium salt were thoroughly mixed in a mortar at a mass ratio of 100:1 to obtain 505 mg of mixed powder.

[0051] (2) Transfer the mixed powder into a high-energy ball mill jar, and then add zirconia ball milling beads, the mass ratio of the ball milling beads to the mixed powder is 70:1, and the total mass is 35.5 g.

[0052] (3) Set the high-energy ball milling program at a rotational speed of 500 rpm / min, and each cycle is divided into 10 minutes of ball milling time and 5 minutes of resting time, and 48 cycles are performed for a total of 12 hours of high-energy ball milling.

[0053] (4) Collect the coated electrolyte powder in an argon atmosphere glove box to obtain a coated sulfide solid electrolyte material.

[0054] The electrochemical performance of the prepared coated sulfide solid electrolyte material was tested. The experimental program mainly consists of four...

Embodiment 2

[0065] (1) In an argon atmosphere glove box, LiSiPSCl sulfide solid electrolyte and LiFSI were thoroughly mixed at a mass ratio of 200:1 to obtain 502.5 mg of a mixed powder sample.

[0066] (2) Transfer the mixed powder into a high-energy ball mill jar, and then add zirconia ball milling beads, the mass ratio of the ball milling beads to the mixed powder is 70:1, and the total mass is 35.5 g.

[0067] (3) Set the high-energy ball milling program at a rotational speed of 500 rpm / min, and each cycle is divided into 10 minutes of ball milling time and 5 minutes of resting time, and 48 cycles are performed for a total of 12 hours of high-energy ball milling.

[0068] (4) Collect the coated electrolyte powder in an argon atmosphere glove box to obtain a coated sulfide solid electrolyte material.

[0069] The same electrochemical performance test scheme and electrolyte ionic conductivity test scheme as in Example 1 were used. It can be obtained that the first-cycle discharge speci...

Embodiment 3

[0071] (1) In an argon atmosphere glove box, LiSiPSCl sulfide solid electrolyte and LiFSI were thoroughly mixed at a mass ratio of 60:1 to obtain 510 mg of a mixed powder sample.

[0072] (2) Transfer the mixed powder into a high-energy ball mill jar, and then add zirconia ball milling beads, the mass ratio of the ball milling beads to the mixed powder is 70:1, and the total mass is 35.5 g.

[0073] (3) Set the high-energy ball milling program at a rotational speed of 500 rpm / min, and each cycle is divided into 10 minutes of ball milling time and 5 minutes of resting time, and 48 cycles are performed for a total of 12 hours of high-energy ball milling.

[0074] (4) Collect the coated electrolyte powder in an argon atmosphere glove box to obtain a coated sulfide solid electrolyte material.

[0075] The same electrochemical performance test scheme and electrolyte ionic conductivity test scheme as in Example 1 were used. We can obtain that the first discharge specific capacity o...

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Abstract

The invention discloses a coated sulfide solid electrolyte material which is composed of sulfide solid electrolyte particles and an organic lithium salt layer coated on the surfaces of the sulfide solid electrolyte particles. The organic lithium salt layer can be subjected to in-situ decomposition in the battery circulation process to form a stable positive electrode-sulfide electrolyte interface, so that the interface stability between the electrolyte in the composite positive electrode and the positive electrode in the solid-state battery can be improved; the problems of electrolyte structure damage, ionic conductivity reduction, generation of harmful reaction byproducts and the like caused by chemical or electrochemical side reaction paths in the circulation process of the electrolyte are inhibited, and the problem of battery capacity attenuation caused by polarization increase of the composite positive electrode side in the circulation process of the battery is effectively improved; the service life of the solid-state battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to a coated sulfide solid-state electrolyte material and a preparation method and application thereof. Background technique [0002] With the rapid development of portable electronic devices such as smartphones, laptops, cameras, etc. in modern society, the large-scale popularization of new energy vehicles and the emergence of scenarios such as the laying of smart grids, people's demand for high-efficiency energy storage devices has increased significantly. Lithium-ion batteries stand out among many energy storage devices due to their advantages such as high energy density, long cycle life, and good safety. However, the organic electrolytes of ethers or esters used in commercial lithium-ion batteries have physical and chemical properties such as flammability, volatility, easy decomposition and gas generation, and easy leakage, which makes the safety of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M4/131H01M10/42H01M10/0525
CPCH01M10/0562H01M4/131H01M10/4235H01M10/0525H01M2004/028Y02P70/50
Inventor 杨勇王康军梁子腾苏宇钟昊悦何霑凝张忠如
Owner XIAMEN UNIV
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