High-ion-conductivity sulfide solid electrolyte based on liquid phase method and preparation method thereof

A solid electrolyte, high-ion technology, applied in electrochemical generators, circuits, electrical components, etc., can solve problems such as the reduction of electrical conductivity, and achieve the effect of eliminating grain boundary resistance, improving electrolyte performance, and improving ionic conductivity.

Active Publication Date: 2019-06-14
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
View PDF8 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes the liquid phase method to obtain the sulfide solid electrolyte of the target crystal form; the present inven

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0050] Example 1

[0051] In the glove box, weigh out Li according to 75∶25 2 S and P 2 S 5 , Added to the container containing dehydrated tetrahydrofuran. Stir at 600 rpm for 48h. The resulting suspension was vacuum filtered. The obtained powder was precipitated and dried at 150°C and -0.1MPa for 2h. Put the obtained powder into a sealed ball mill tank, vacuum the ball mill tank, and ball mill for 3 hours at a rotation speed of 300 rpm. Take out the material in the glove box, heat treatment at 200°C for 1 h under the protection of an inert atmosphere to obtain the target sulfide solid electrolyte.

[0052] The electrolyte obtained above was put into a mold, and hot pressed at 100 MPa and 100° C. for 30 minutes to obtain a sulfide solid electrolyte sheet with a thickness of 30 μm. The prepared solid electrolyte has an ionic conductivity of 1.3×10 at room temperature -3 S / cm.

Example Embodiment

[0053] Example 2

[0054] In the glove box, weigh Li according to 70:29 2 S, P 2 S 5 , Added to the container containing dehydrated tetrahydrofuran. Stir at 600 rpm for 24h. The resulting suspension was dried at 150°C and -0.1MPa for 12 hours. The obtained powder and the measurement ratio of P 2 O 5 (Li 2 S: P 2 S 5 : P 2 O 5 =70:29:1) Put it into a sealed ball mill jar, vacuum the ball mill jar, and ball mill for 3 hours at a speed of 300 rpm. Take out the material from the glove box and heat it at 230°C for 2h under the protection of an inert atmosphere to obtain the target sulfide solid electrolyte.

[0055] The electrolyte obtained above was put into a mold, and hot pressed at 100 MPa and 100° C. for 30 minutes to obtain a sulfide solid electrolyte sheet with a thickness of 30 μm. The prepared solid electrolyte has an ionic conductivity of 6.2×10 at room temperature -3 S / cm.

Example Embodiment

[0056] Example 3

[0057] In the glove box, weigh Li according to 70:25 2 S, P 2 S 5 , Added to a container containing anhydrous acetonitrile. Stir at 1000 rpm for 36 hours. The resulting suspension was dried at 150°C and -0.1MPa for 12 hours. The obtained powder and the metering ratio of LiCl (Li 2 S: P 2 S 5 :LiCl=70:25:5) Put it into a sealed ball mill jar, evacuate the ball mill jar, and ball mill for 3 hours at 300 rpm. Take out the material in the glove box, heat treatment at 260°C for 1 h under the protection of an inert atmosphere to obtain the target sulfide solid electrolyte.

[0058] Add the obtained electrolyte to the NMP sizing and apply it on the PET film, pass 5 sets of counter rolls (total length 0.6m) with a pitch of 30μm and a temperature of 150℃ at a speed of 10cm / min, and then peel off after vacuum drying at 80℃ for 1h. Sulfide electrolyte membrane. The prepared solid electrolyte has an ionic conductivity of 9.2×10 at room temperature -4 S / cm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Ionic conductivityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a high-ion-conductivity sulfide solid electrolyte based on a liquid phase method and a preparation method thereof. The preparation method comprises the following steps: (1) adding raw materials at least comprising Li2S and P2S5 and a solvent into a stirring container, stirring, performing vacuum filtration, and drying under reduced pressure to obtain a mixture a; (2) filling the mixture a in the step (1) into a ball milling tank, vacuumizing, and performing ball milling to obtain a mixture b; (3) and taking out the mixture b in the step (2) from a glove box, and performing heat treatment under the protection of inert atmosphere to obtain the high-ion-conductivity sulfide solid electrolyte material. According to the invention, the porous structure introduced by solvent and crystallization solvent molecules in the obtained sulfide solid electrolyte is eliminated by secondary ball milling under reduced pressure after drying under reduced pressure, so that the high-ion-conductivity sulfide solid electrolyte is obtained. The invention further adopts a hot pressing or hot paired roller mode for molding, thereby enhancing the combination effect of the sulfide solidelectrolyte and further improving the ionic conductivity.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes, in particular to a high ion conductivity sulfide solid electrolyte based on a liquid phase method and a preparation method thereof. Background technique [0002] The ever-increasing consumption of digital electronics and the emerging electric vehicle industry have put forward higher requirements for energy storage devices. Lithium secondary batteries have many advantages such as high energy density, excellent cycle performance, no memory effect and no environmental pollution, and are favored by the market. However, lithium-ion batteries using organic electrolytes are gradually failing in the face of the market's increasingly high requirements for safety, energy density, and cycle life. [0003] Inorganic solid electrolytes have the advantages of non-flammability, wide electrochemical stability window, and large shear modulus, and have the advantages of safety and service life that org...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M10/0562H01M10/0525
CPCY02E60/10
Inventor 卢骋陈功田光磊佘圣贤
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap