Solid electrolyte sheet and preparation method of sulfide solid electrolyte sheet

A technology of solid electrolyte and sulfide, which is applied in the direction of solid electrolyte fuel cells, solid electrolytes, non-aqueous electrolytes, etc., can solve the problem that solid electrolyte sheets are easily broken, achieve uniformity of sulfide solid electrolyte sheets, reduce thickness, and improve preparation success rate effect

Pending Publication Date: 2020-04-03
HUANENG CLEAN ENERGY RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention provides a preparation method of a solid electrolyte sheet and a sulfide solid electrolyte sheet. The sulfide solid electrolyte sheet of the present inv

Method used

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  • Solid electrolyte sheet and preparation method of sulfide solid electrolyte sheet
  • Solid electrolyte sheet and preparation method of sulfide solid electrolyte sheet

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preparation example Construction

[0028] A method for preparing a sulfide solid electrolyte sheet, comprising the following steps:

[0029] Step 1, the Li 2 S and P 2 S 5 The raw materials are mixed according to the set molar ratio, and ball milled to obtain the mixed powder; Li 2 S and P 2 S 5 The molar ratio of Li 2 S:P 2 S 5 =2.0~4.0; adopt ball mill to carry out ball milling, the rotating speed of ball milling is 370-510rpm, the time of ball milling is 30-40h;

[0030] Step 2, the mixed powder obtained in step 1 is crushed under a protective atmosphere and then sealed in a vacuum environment, and then heat-treated to obtain an electrolyte powder; the mixed powder is sealed in a vacuum quartz glass tube, and the vacuum degree of the vacuum quartz glass tube is lower than 0.1MPa; heat treatment temperature is 240-260℃, heat treatment time is 2-4h;

[0031] Step 3, take the polymer fiber skeleton and place it in a tableting mold, take out the electrolyte powder obtained in step 2 under a protective a...

Embodiment 1

[0034] Will Li 2 S and P 2 S 5 As the initial raw material, weigh Li 2 S mass 0.9827g, P 2 S 5 Mass 2.0173g, then Li 2 S and P 2 S 5 Place it in a 50mL zirconia ball mill jar (contains 10 ZrO particles with a diameter of 10mm) 2 Ball milling beads), and placed in the high-energy ball mill of the ball mill, the ball milling time is 40h, the ball milling speed is 370rpm, and the ball milling temperature is normal temperature; 2 2 (07 P 3 S 11 Sulfide solid electrolyte. After heat treatment and cooling, take out the powder in the glove box, and use a 450-mesh sieve to screen out the powder that meets the particle size.

[0035] The polymer fiber skeleton is cut and cut, and then placed in a tableting mold, the fired powder is evenly spread on the polymer fiber skeleton, and then directly compressed into a tablet under a tablet machine at a pressure of 400 MPa to obtain a polymer Li supported by the fibrous skeleton 7 P 3 S 11 Sulfide solid-state electrolyte sheet, ...

Embodiment 2

[0039] Will Li 2 S and P 2 S 5 As the initial raw material, weigh Li 2 S mass 1.1554g, P 2 S 5 Mass 1.8445g, then Li 2 S and P 2 S 5 Place it in a 50mL zirconia ball mill jar (contains 10 ZrO particles with a diameter of 10mm) 2 ball milling beads), and placed in a ball mill for high-energy ball milling, the ball milling time was 30 h, the ball milling speed was 510 rpm, and the ball milling temperature was normal temperature. After ball milling, in an argon-filled glove box (O 2 2 O3 P.S. 4 Sulfide solid electrolyte. After heat treatment and cooling, take out the powder in the glove box, and use a 600-mesh sieve to screen out the powder that meets the particle size.

[0040] The polymer fiber backbone is trimmed and placed in a tablet mold. Spread the fired powder evenly on the polymer fiber skeleton. Then it was directly compressed into tablets under a tablet press at a pressure of 360 MPa to obtain Li 3 P.S. 4 A sulfide solid electrolyte sheet, which has exce...

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Abstract

The invention discloses a solid electrolyte sheet and a preparation method of a sulfide solid electrolyte sheet. The solid electrolyte sheet comprises a plurality of skeletons and a solidified solid electrolyte, the skeletons are embedded in the solid electrolyte, the skeletons are crossed, and pores are arranged among the skeletons; the preparation method comprises the following steps: mixing Li2S and P2S5 raw materials according to a set molar ratio, carrying out ball milling to obtain mixed powder, grinding the mixed powder in a protective atmosphere, sealing the ground mixed powder in a vacuum environment, and carrying out heat treatment to obtain electrolyte powder; and placing the solid electrolyte sheet and the polymer fiber skeletons in a tabletting mold, and performing tablettingin a protective atmosphere to obtain a sulfide solid electrolyte sheet. According to the structure of the solid electrolyte sheet, the strength of the solid electrolyte can be improved, the preparation success rate of the electrolyte sheet is improved, the sulfide solid electrolyte sheet prepared by adopting the polymer fiber skeletons has high strength and structural stability, the thickness of the solid electrolyte sheet is reduced, and the possibility is provided for further preparing a high-energy-density sulfide all-solid-state battery.

Description

technical field [0001] The invention belongs to the technical field of all solid batteries, and in particular relates to a preparation method of a solid electrolyte sheet and a sulfide solid electrolyte sheet. Background technique [0002] Since the 1990s, lithium-ion batteries have been vigorously developed and gradually applied to mobile electronic devices and electric vehicles. With the large-scale application of lithium-ion batteries, its safety issues cannot be ignored. Because traditional lithium-ion batteries contain a large amount of flammable and explosive organic liquid electrolyte, when the battery is overcharged or overdischarged or impacted and collided, it is easy to cause the battery to burn or even explode. The safety problem of batteries also limits the further large-scale application of lithium-ion batteries. At present, all-solid-state batteries are composed of positive electrodes, negative electrodes and solid electrolytes, and do not contain any liquid...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M8/10
CPCH01M8/10H01M10/0562H01M2300/0068Y02E60/10Y02E60/50
Inventor 徐若晨曹曦裴杰刘明义朱勇曹传钊朱连峻郑建涛李晴徐越张汉志宋向阳耿巍巍王绍民
Owner HUANENG CLEAN ENERGY RES INST
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