Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Three-dimensional inorganic polymer composite solid electrolyte and ternary solid-state lithium battery

A solid electrolyte and inorganic polymer technology, applied in solid electrolyte, non-aqueous electrolyte battery, lithium battery, etc., can solve the problems of poor long-term cycle performance of batteries, mechanical properties of composite solid electrolytes that need to be further improved, and short cycle life. Achieve the effects of improving cycle stability, low cost, and prolonging cycle life

Inactive Publication Date: 2020-06-05
SAIC MOTOR +1
View PDF7 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the self-supporting inorganic polymer composite solid electrolyte prepared from PVDF, LLZO, and lithium salt in the prior art has poor long-term cycle performance and short cycle life when applied to batteries, and the mechanical properties of the composite solid electrolyte to be further improved

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-dimensional inorganic polymer composite solid electrolyte and ternary solid-state lithium battery
  • Three-dimensional inorganic polymer composite solid electrolyte and ternary solid-state lithium battery
  • Three-dimensional inorganic polymer composite solid electrolyte and ternary solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First, in an argon glove box, PVDF HSV 900 and nanometer Ta-LLZO ceramic powder (average particle size is 300nm, particle size distribution diagram as shown in Fig. figure 1 shown), and the lithium salt LiFSI was dissolved in NMP and stirred for 12 h to obtain a uniform viscous slurry.

[0047] Then, the slurry is scraped-coated on the PI porous membrane using a casting coating machine. During the casting coating process, the height of the membrane device is adjusted to be 10-500 microns, and the moving speed of the push rod is 1-50 mm / sec. Repeat scraping times 2 to 5 times, the amount of slurry coating is 1.95mg / cm 2 (The following examples are the same), air drying at 80°C for 12h, vacuum drying at 60°C for 24h to remove residual solvent, and obtain LLZO-PVDF composite solid electrolyte based on PI porous membrane.

[0048] In addition, micron (particle size 3-5 micron) and submicron (particle size 0.6-1 micron) Ta-LLZO ceramic powders were used as fillers, respecti...

Embodiment 2

[0055] First, in an argon glove box, dissolve PVDF HSV 1800, nano-Al-LLZO ceramic powder (average particle size 200nm) and lithium salt LiTFSI in NMP with a mass ratio of 30:30:40, and stir for 15 hours to obtain Uniform viscous slurry.

[0056] Then, the slurry is coated on a PI porous membrane using a cast coater (surface morphology see Figure 4 Scanning electron microscope photographs, the scale is 5 microns), 80 ° C blast drying for 8 hours, 60 ° C vacuum drying for 24 hours to remove residual solvents, to obtain LLZO-PVDF composite solid electrolyte based on PI porous membrane; after the coating electrolyte slurry is dried, the surface Refer to the appearance Figure 5 . according to Figure 4 and Figure 5 In contrast, it can be seen that the electrolyte slurry is uniformly and densely filled in the pores of the PI porous membrane, forming a three-dimensional solid electrolyte.

[0057] The room temperature ionic conductivity of the composite electrolyte is 2.3×10 -...

Embodiment 3

[0060] First, in an argon glove box, PVDF 761A with a mass ratio of 30:40:30, nanometer Ta-LLZO ceramic powder (average particle size of 300nm, also known as LLZTO) and lithium salt LiClO 4 Dissolved in NMP, stirred for 10h to obtain a uniform viscous slurry.

[0061] Then, the slurry was coated on the PI porous membrane using a casting coater, air-dried at 60°C for 12h, and vacuum-dried at 70°C for 48h to remove residual solvents to obtain a LLZO-PVDF composite solid electrolyte based on the PI porous membrane (reference It is PI+LLZTO-PVDF composite electrolyte).

[0062] In addition, the composite electrolyte LLZTO-PVDF with no PI porous membrane as the substrate (the preparation method is the same as that with the PI porous membrane as the substrate, the difference is that the electrolyte without the PI membrane substrate is the electrolyte slurry by casting coating machine coated on a glass plate, and after drying, a self-supporting film without a PI film substrate is ob...

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
Aperture rangeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a three-dimensional inorganic polymer composite solid electrolyte and a ternary solid-state lithium battery. The composite solid electrolyte is formed by casting and coating electrolyte slurry on a polyimide porous membrane. The electrolyte slurry comprises a polymer, nano ceramic powder and lithium salt, and the electrolyte slurry permeates into the polyimide porous membrane to form the solid electrolyte in a three-dimensional structure. According to the invention, the polyimide porous membrane is used as a base material film; the electrolyte slurry containing the nanoceramic powder and the polymer is coated through tape casting, so that the slurry fully permeates into the polyimide porous membrane to form the composite solid electrolyte in the three-dimensional skeleton structure, and the performance parameters of the composite solid electrolyte are controllable; the mechanical properties of the composite solid electrolyte are greatly improved; the lithium dendritic crystal growth inhibition capability is enhanced; the cycle stability of the battery can be improved; and the cycle life is prolonged; and in addition, the preparation process of the three-dimensional inorganic polymer composite solid electrolyte is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of solid-state lithium battery production, in particular to a three-dimensional inorganic polymer composite solid electrolyte and a ternary solid-state lithium battery. Background technique [0002] Lithium-ion batteries are currently the battery system with the best comprehensive performance, featuring high specific energy, high cycle life, small size, light weight, no memory effect, and no pollution. However, currently widely used lithium-ion batteries use flammable liquid organic electrolytes or gel electrolytes, which have potential safety hazards such as flammability and internal short circuits, while the use of solid electrolytes can fundamentally ensure the safety of lithium-ion batteries Therefore, solid electrolytes have always been one of the research hotspots in the industry. According to different types of components, solid electrolytes can be divided into three categories: polymer electrolytes,...

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): H01M10/056H01M10/052H01M10/0525
CPCH01M10/052H01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 张博晨胡江奎刘波谷穗范丽珍
Owner SAIC MOTOR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com