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Sulfide solid electrolyte and preparation method and application thereof

A solid electrolyte, sulfide technology, applied in solid electrolytes, composite electrolytes, non-aqueous electrolytes, etc., can solve problems such as no battery electrochemical performance, and achieve good air stability, good ionic conductivity, and low synthesis cost. Effect

Pending Publication Date: 2022-03-04
湖州昆仑先端固态电池科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN113104813A discloses a kind of sulfide solid electrolyte and its preparation method, by introducing BH 4 - The anionic group increases the transport channel and promotes the conduction of lithium ions, while the ionic conductivity of the sulfide solid electrolyte is improved, but it does not involve the electrochemical performance of the battery

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  • Sulfide solid electrolyte and preparation method and application thereof
  • Sulfide solid electrolyte and preparation method and application thereof
  • Sulfide solid electrolyte and preparation method and application thereof

Examples

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Embodiment 1

[0040] This embodiment provides a preparation method of a sulfide solid electrolyte, the preparation method is as follows:

[0041] (1) Under the protection of an argon atmosphere, according to the ratio of the substance molar ratio of 4.5:1:1:0.5:2, weigh Li with a purity of more than 99%. 2 S, P 2 S 5 , metal Li powder, sulfur and LiCl are mixed, then the above-mentioned raw materials are ball milled under the condition of moisture content below 10ppm, the rotating speed of the ball mill is 350rpm, and the time of the ball mill is 15.0h, wherein the ball-to-material ratio of the ball mill is 35:1, obtaining Primary powder material.

[0042] (2) The powder raw material obtained in step (1) is pressed into tablets by a tablet press to obtain a sheet-like raw material, and the sheet-shaped raw material is loaded into a sintering mold for sintering, wherein the temperature is raised to 550°C, the sintering time is 4.0h, and then cooled to room temperature with the furnace, ta...

Embodiment 2

[0044] This embodiment provides a preparation method of a sulfide solid electrolyte, the preparation method is as follows:

[0045] (1) Under the protection of an argon atmosphere, weigh Li with a purity of more than 99% according to the ratio of the substance molar ratio of 4.5:1:1.02:0.5:2 2 S, P 2 S 5 , metal Li powder, sulfur and LiCl are mixed, then the above-mentioned raw materials are ball milled under the condition of moisture content below 10ppm, the rotating speed of the ball mill is 350rpm, and the time of the ball mill is 15.0h, wherein the ball-to-material ratio of the ball mill is 35:1, obtaining Primary powder material.

[0046] (2) The powder raw material obtained in step (1) is pressed into tablets by a tablet press to obtain a sheet-like raw material, and the sheet-shaped raw material is loaded into a sintering mold for sintering, wherein the temperature is raised to 550°C, the sintering time is 4.0h, and then cooled to room temperature with the furnace, t...

Embodiment 3

[0048] This embodiment provides a preparation method of a sulfide solid electrolyte, the preparation method is as follows:

[0049] (1) Under the protection of an argon atmosphere, weigh Li with a purity of more than 99% according to the ratio of the substance molar ratio of 4.5:1:1.02:0.5:1:1 2 S, P 2 S 5 , metal Li powder, sulfur, LiCl and LiBr are mixed, and then the above raw materials are ball milled under the condition of water content below 10ppm, the rotating speed of the ball mill is 350rpm, the time of the ball mill is 15.0h, and the ball-to-material ratio of the ball mill is 35:1 , to obtain the first powder material.

[0050] (2) The powder raw material obtained in step (1) is pressed into tablets by a tablet press to obtain a sheet-like raw material, and the sheet-shaped raw material is loaded into a sintering mold for sintering, wherein the temperature is raised to 550°C, the sintering time is 4.0h, and then cooled to room temperature with the furnace, take ou...

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Abstract

The invention provides a sulfide solid electrolyte and a preparation method and application thereof. The chemical formula of the sulfide solid electrolyte is Li6PS5Cl1-zMz, M is Br or I, and z is larger than or equal to 0 and smaller than 1. The preparation method comprises the following steps: mixing Li2S, P2S5, metal Li powder, sulfur, LiCl and LiM, and mechanically grinding to obtain a powder primary material; and sintering the obtained primary powder material to obtain the sulfide solid electrolyte. According to the preparation method of the sulfide solid electrolyte provided by the invention, the lithium ion conductivity of the sulfide solid electrolyte and the stability of a material interface are improved, and the capacity retention ratio of the prepared solid-state battery is optimized.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a sulfide solid electrolyte and a preparation method and application thereof. Background technique [0002] As one of the main energy storage devices, the battery has the advantages of high energy density and long cycle life. However, the organic solvent used in the electrolyte is flammable, which limits the further application of the battery. In recent years, all-solid-state batteries have attracted widespread attention due to their high safety performance. Unlike traditional electrolytes, solid-state electrolytes can not only prevent electrolyte leakage and electrode short circuits, but also increase the energy density of batteries in one step. [0003] At present, solid-state electrolytes can be mainly divided into three categories: sulfide solid-state electrolytes, oxide solid-state electrolytes, and polymer solid-state electrolytes. Among them, in terms of ionic conduc...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/052
CPCH01M10/0562H01M10/052H01M2300/0068H01M2300/0088Y02E60/10
Inventor 孙春胜朱少华申海鹏王靖
Owner 湖州昆仑先端固态电池科技有限公司
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