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

Composite solid electrolyte and preparation method thereof, and solid lithium battery and preparation method thereof

A technology of solid electrolyte and solid lithium, which is applied in the manufacture of electrolyte batteries, composite electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of low decomposition voltage, small number of ion migration, poor ability to dissolve lithium salts, etc., to achieve small interface resistance, The effect of high ion transfer number and low price

Inactive Publication Date: 2020-03-13
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
View PDF7 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low decomposition voltage, small ion migration number and poor ability to dissolve lithium salts in the polyethylene oxide-based composite solid electrolyte, the invention provides a composite solid electrolyte and a preparation method thereof

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
  • Composite solid electrolyte and preparation method thereof, and solid lithium battery and preparation method thereof
  • Composite solid electrolyte and preparation method thereof, and solid lithium battery and preparation method thereof
  • Composite solid electrolyte and preparation method thereof, and solid lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The invention provides a method for preparing a composite solid electrolyte, comprising the following steps:

[0040] Dissolving at least one polymer of polycaprolactone and polycaprolactone derivatives and lithium salt in an organic solvent to obtain a first solution;

[0041] adding garnet oxide to the first solution, and mixing to obtain a second solution;

[0042] The second solution is cast and dried to obtain a composite solid electrolyte.

[0043]The above-mentioned preparation method is explained in detail below.

[0044] The polycaprolactone derivatives involved are polystyrene-polycaprolactone, polyethylene oxide-polycaprolactone, polyvinylidene fluoride-polycaprolactone, polyacrylonitrile-polycaprolactone, perfluoropolyether - at least one of polycaprolactone, polymethacrylic acid-polycaprolactone, polydimethylsiloxane-polycaprolactone.

[0045] The lithium salt is selected from lithium bistrifluoromethylsulfonylimide, lithium bisfluorosulfonimide, lithium...

Embodiment 1

[0076] A method for preparing a composite solid electrolyte, comprising the steps of:

[0077] S11. 1 g of polycaprolactone (PCL) and 0.25 g of LiFSI were dissolved in acetonitrile solvent and mixed uniformly to obtain a first solution.

[0078] S12. Add 0.139g Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Add to the first solution obtained in step S11, and mix well to obtain the second solution.

[0079] S13. Cast the second solution obtained in step S12 into a polytetrafluoroethylene container, then place it in a vacuum drying oven, and dry it at 80° C. for 12 hours to obtain a composite solid electrolyte.

[0080] The composite solid electrolyte obtained in Example 1 is tested for mechanical properties, AC impedance and ionic conductivity, electrochemical window and ion migration number, wherein:

[0081] (1). Stress-strain curve: using the conventional stress-strain measurement method, the test results are as follows figure 1 shown.

[0082] from figure 1 It can be seen that whe...

Embodiment 2

[0092] A method for preparing a composite solid electrolyte, comprising the steps of:

[0093] S21. Dissolving 1 g of polycaprolactone (PCL) and 0.5 g of LiFSI in tetrahydrofuran solvent and mixing them uniformly to obtain a first solution.

[0094] S22. Add 0.22g Li 5 La 3 Ta 2 o 12 Add to the first solution obtained in step S21, and mix well to obtain a second solution.

[0095] S23. Cast the second solution obtained in step S22 into a polytetrafluoroethylene plate, then place it in a vacuum drying oven, and dry it at 60° C. for 15 hours to obtain a composite solid electrolyte.

[0096] According to the test method of Example 1, the composite solid electrolyte obtained in Example 2 was subjected to corresponding performance tests. After testing, at 60°C, the ionic conductivity of the composite solid electrolyte is 1.5×10 -4 S / cm, the decomposition voltage is 4.7V, and the ion migration number is 0.543.

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
Ionic conductivityaaaaaaaaaa
Ionic conductivityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of solid-state lithium batteries, and particularly provides a composite solid-state electrolyte and a preparation method thereof, a solid-state lithium battery and a preparation method thereof. The preparation method comprises the following steps of dissolving at least one polymer of polycaprolactone and a polycaprolactone derivative and a lithium saltin an organic solvent to obtain a first solution; adding garnet oxide into the first solution, and uniformly mixing to obtain a second solution; and casting and drying the second solution to obtain the composite solid electrolyte. The preparation method disclosed by the invention has the characteristics of simple process, low energy consumption, no pollution, low price and the like; more importantly, the obtained composite electrolyte has the characteristics of high ionic conductivity, electrochemical window greater than 4.5 V, high ion mobility, small interface resistance, good mechanical properties and the like.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium batteries, and in particular relates to a composite solid electrolyte and a preparation method thereof, a solid-state lithium battery and a preparation method thereof. Background technique [0002] Solid-state lithium batteries have the advantages of high energy density, good safety, high working voltage, and no safety problems of liquid electrolyte due to high temperature, so they have great application prospects in many fields. The key component in a solid-state lithium battery is a solid-state electrolyte, which is generally required to have a high ionic conductivity at a stable operating voltage and operating temperature. [0003] Common solid electrolytes are mainly divided into two categories: inorganic ceramic solid electrolytes and organic polymer solid electrolytes. Among them, inorganic ceramic electrolytes include sulfides, oxides, hydrides, borides and phosphides, which ha...

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): H01M10/058H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0088Y02E60/10Y02P70/50
Inventor 邓永红王庆荣池上森韩兵徐洪礼冯东宇王军
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY 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