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

Solid electrolyte and preparation method thereof, and lithium secondary solid-state battery

A solid electrolyte, lithium salt technology, applied in non-aqueous electrolyte battery, electrolyte battery manufacturing, secondary battery and other directions, can solve the problems of complex preparation method and high cost, achieve simple preparation process, high production efficiency, and improve energy density. Effect

Active Publication Date: 2020-09-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF13 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is complicated and the cost is high

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
  • Solid electrolyte and preparation method thereof, and lithium secondary solid-state battery
  • Solid electrolyte and preparation method thereof, and lithium secondary solid-state battery
  • Solid electrolyte and preparation method thereof, and lithium secondary solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] The preparation method of the solid electrolyte of the present invention comprises the following steps:

[0051] a, mixing the polymer substrate, lithium salt and additives to obtain a slurry;

[0052] b. The slurry is formed into a film, and then dried to obtain a solid electrolyte;

[0053] In one embodiment, step a can specifically adopt the following method:

[0054] (1) Select polymer substrates, additives, and select a certain quality of solvents, including but not limited to NMP, DMF, etc., calculated by mass ratio, controlled at 60% to 85% of the total amount of slurry;

[0055] (2) adding the polymer substrate into the solvent, and stirring at room temperature for 1 to 2 hours to form a stable and uniform transparent colloid;

[0056] (3) Ultrasonic disperse the additive in a solvent whose total mass of the slurry is 10% for 10 minutes to 1 hour.

[0057] (4) Add the supersonicated additive and lithium salt directly to the glue solution prepared in step (2),...

Embodiment 1

[0064] Synthesis of Ta-doped β-LiAlSi 2 o 6 , the synthesis steps are as follows:

[0065] (1) LiOH·H with a mass percentage of 28.7% 2 O, 65.7% montmorillonite, 5.6% tantalum oxide were stirred in 20ml (when the montmorillonite was 7.1g) in isopropanol for 24 hours and dried.

[0066] (2) Grind the lumps dried in step (1) into powder, place them evenly in a crucible, and burn them in air at 900° C. for 9 hours with a heating rate of 5° C. / min.

[0067] (3) The powder sample completed by burning paper in step (2) was ball milled 30 times at a speed of 800r / min, each time being 5min, to obtain β-LiAlSi doped with Ta 2 o 6 ,spare.

[0068] The Ta-doped β-LiAlSi 2 o 6 See the XRD pattern of figure 1 . figure 1 Among them, MMT is the XRD pattern of montmorillonite. From figure 1 It can be seen that the peaks at 23.7° and 25.48° are Ta-doped β-LiAlSi 2 o 6 The two most obvious characteristic peaks of XRD show that the present invention has successfully prepared Ta-dope...

Embodiment 2

[0096] Referring to the preparation method of Example 1, the composition of the solid electrolyte is changed, and the solid electrolyte is composed of the following components in mass percentage: 65% of the polymer substrate; 25% of the lithium salt; 10% of the additive; wherein, the polymer substrate is Polyvinylidene fluoride (PVDF), lithium salt is LiTFIS, additive is β-LiAlSi doped with Ta 2 o 6 .

[0097] Using this solid electrolyte to form a battery, the first charge and discharge capacity is 150mAh / g at a rate of 0.1C. According to the picture of the rate performance, the capacity is also close to 150mAh / g at 35 cycles, and the Coulombic efficiency is close to 100%; at a rate of 0.5C , the first cycle capacity is 100mAh / g, but it will quickly rise to 130mAh / g after 2-3 cycles, the capacity is close to 135mAh / g at 40 cycles, and the capacity is still 110mAh / g after 600 cycles.

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 relates to a solid electrolyte and a preparation method thereof, and a lithium secondary solid-state battery, belongs to the technical field of secondary batteries and solves a technicalproblem to provide a low-cost solid electrolyte. The solid electrolyte comprises a polymer base material, lithium salt and additive, wherein the additive is Ta-doped beta-LiAlSi2O6. By adopting the novel inorganic solid electrolyte additive, ionic conductivity of the solid electrolyte is improved, meanwhile, growth of lithium dendrites can be inhibited, energy density of the battery is improved,and finally, cycle performance and the rate capability of the battery are improved. The solid electrolyte further has ion conductivity, high ion mobility and good cycle performance and rate capabilityat room temperature. The preparation process is simple, the solid electrolyte slurry can be well mixed in a short time, production efficiency is high, and manufacturing cost is low.

Description

technical field [0001] The invention relates to a solid electrolyte, a preparation method thereof and a lithium secondary solid state battery, belonging to the technical field of secondary batteries. Background technique [0002] With the continuous development of new energy electric vehicles and portable electronic devices, lithium-ion batteries have become the first choice for commercial batteries, but the energy density of traditional liquid lithium-ion batteries is low, and the energy density of liquid lithium iron phosphate secondary batteries is only 150Wh / kg, it is difficult to meet the needs of new energy electric vehicles and portable electronic devices for high energy density secondary batteries. At the same time, the difficulty in ensuring the safety of liquid lithium-ion batteries is another important factor restricting the development of the new energy industry. Therefore, finding a higher energy density and safer secondary battery system is the key to the deve...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/052H01M10/42
CPCH01M10/052H01M10/056H01M10/058H01M10/4235H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 吕维强孙庆伟张星意
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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