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High-performance sulfide solid electrolyte sheet as well as preparation method and application thereof

A technology of solid electrolyte and electrolyte sheet, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of low density and low ionic conductivity, and achieve the effect of reducing density

Active Publication Date: 2022-07-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-performance sulfide solid electrolyte sheet and its preparation method and application in order to solve the technical problem of low density and ionic conductivity of the existing sulfide solid electrolyte sheet

Method used

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  • High-performance sulfide solid electrolyte sheet as well as preparation method and application thereof
  • High-performance sulfide solid electrolyte sheet as well as preparation method and application thereof
  • High-performance sulfide solid electrolyte sheet as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0032] Example 1: Sulfide solid state electrolyte powder was prepared as follows:

[0033] Step (1): under an inert atmosphere, place 1 g of lithium sulfide (purity > 99%) and phosphorus pentasulfide (purity > 98%) in an agate mortar and grind separately for 10 minutes in a molar ratio of 4:1, and then grind the two Mixing and grinding for 10min to mix to obtain raw material powder;

[0034] Step (2): under an inert atmosphere, transfer 1 g of the raw material powder obtained in step 1 into a 100 mL aluminum oxide ball milling jar, seal it and put it into a ball mill for two-way ball milling, first clockwise ball milling for 30 minutes, and let stand for 10 minutes , and then ball-milled counterclockwise for 30min, left standing for 10min, the ball-milling speed was 370r / min, the total ball-milling time was 20h, and the grinding balls were 5 aluminum oxide grinding balls with a diameter of 10 mm and 15 with a diameter of 5 mm to obtain the solid state of sulfide. Electrolyte ...

Embodiment 2

[0040] Embodiment 2: The preparation method of a high-performance sulfide solid-state electrolyte sheet of this embodiment is carried out according to the following steps:

[0041] Step 1: After compacting the sulfide solid electrolyte powder of Example 1 to 801 μm, 804 μm, and 806 μm respectively, perform hot-pressing pretreatment at 280 °C, the heating rate is 20 °C / min, the holding time is 3h, and the heating is started for 1h After applying pressure, the pressure is 500 MPa, and the pressure holding time is 1 h. After the pressure is released, the heat preservation is continued, and after the heat preservation is completed, it is naturally cooled to room temperature to obtain an electrolyte sheet precursor; in this step, rapid cooling is adopted, thereby retaining the high phase transition temperature obtained. ionic phase;

[0042] Step 2: Heating the electrolyte sheet precursor to 130°C, the heating rate is 20°C / min, applying a pressure of 500MPa while heating and mainta...

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Abstract

The invention discloses a high-performance sulfide solid electrolyte sheet and a preparation method and application thereof. The invention belongs to the field of solid electrolyte. The invention aims to solve the technical problem that the existing sulfide solid electrolyte sheet is low in density and ionic conductivity. The high-performance sulfide solid electrolyte sheet is prepared by performing hot pressing pretreatment on sulfide solid electrolyte powder and then performing vitrification treatment, the density of the high-performance sulfide solid electrolyte sheet is higher than 98.5%, the lithium ion conductivity is higher than 3mS / cm, and the ion activation energy is lower than 15kJ / moL. The invention discloses a method for carrying out vitrification treatment on a material in a glass transition interval to prepare a sheet, so that the aims of reducing the crack density of a sulfide solid electrolyte sheet and improving the grain boundary structure of the sulfide solid electrolyte sheet are fulfilled, and the sulfide solid electrolyte sheet with high density and high ionic conductivity is obtained.

Description

technical field [0001] The invention belongs to the field of solid electrolytes, and in particular relates to a high-performance sulfide solid-state electrolyte sheet and a preparation method and application thereof. Background technique [0002] With the wide application of electric vehicles, solid electrolytes have attracted much attention due to their good safety. Among them, sulfide solid electrolytes have good machinability and high ionic conductivity on the basis of extremely high safety. As a result, more attention has been paid to solid electrolytes. Solid electrolytes mainly include oxides, sulfides, and polymer solid electrolytes. Among them, sulfide solid electrolytes have extremely strong processing properties and extremely high ionic conductivity, so solid electrolytes are especially Sulfide solid electrolytes have received extensive attention due to their good machinability and cycling stability. [0003] At present, the existing sulfide solid electrolyte shee...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0068Y02P70/50Y02E60/10
Inventor 钱明芳贾政刚张学习
Owner HARBIN INST OF TECH
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