Unlock instant, AI-driven research and patent intelligence for your innovation.

Mesoporous nanoparticle gel composite electrolyte with lithium ion conduction as well as preparation method and application of mesoporous nanoparticle gel composite electrolyte

A composite electrolyte and nanoparticle technology, used in composite electrolytes, electrolyte immobilization/gelling, circuits, etc., can solve the problems of low decomposition voltage, inability to meet large-scale applications, and low ionic conductivity, and achieve ionic conductivity. The effect of improving, improving mechanical properties, and high conductivity at room temperature

Active Publication Date: 2020-06-02
INST OF CHEM CHINESE ACAD OF SCI
View PDF16 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The widely studied PEO-based polymer electrolytes have the limitations of low ionic conductivity and low decomposition voltage. The composite electrolyte prepared by adding inorganic fillers can improve the ionic conductivity and mechanical properties. The ionic conductivity of the composite electrolyte is 10 -5 ~10 -4 Between the ion conductivity of conventional liquid lithium-ion batteries10 -3 ~10 -2 There is still a big gap in comparison, and it cannot meet the needs of large-scale applications. Therefore, a flexible gel composite electrolyte with an ion conductivity comparable to that of liquid lithium-ion batteries has been prepared.

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
  • Mesoporous nanoparticle gel composite electrolyte with lithium ion conduction as well as preparation method and application of mesoporous nanoparticle gel composite electrolyte
  • Mesoporous nanoparticle gel composite electrolyte with lithium ion conduction as well as preparation method and application of mesoporous nanoparticle gel composite electrolyte
  • Mesoporous nanoparticle gel composite electrolyte with lithium ion conduction as well as preparation method and application of mesoporous nanoparticle gel composite electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1, PEO / LiTFSI / PVDF-HFP / surface modified mesoporous nanoparticles (MCM41-Li)

[0061] Synthesis of surface-modified mesoporous nanoparticles: synthetic routes such as figure 1 As shown, the specific steps are as follows: 50mL of toluene and 1.5g of mesoporous silica MCM41, N 2 After stirring for 60 minutes under the atmosphere, slowly add 3g of MPTMS (mercaptopropyltrimethoxysilane), keep stirring at 40°C for 12h, wash with ethanol and water three times and vacuum dry at 40°C for 12h to obtain mercaptolated mesoporous silica; The above product was dissolved in 30% hydrogen peroxide solution in N 2 Stir under air for 10 hours, the product is washed with alcohol and water to obtain a wet material; add the above wet material to 1mol / L lithium nitrate and stir for 6 hours, wash with ethanol and water three times, and dry in vacuum to obtain surface-modified mesoporous nanoparticles, denoted as MCM41 -Li.

[0062] Preparation of composite electrolyte membrane: 0.5g...

Embodiment 2

[0064] Example 2, PEO / LiTFSI / PVDF-HFP / surface modified mesoporous nanoparticles (SBA15-Li)

[0065] Synthesis of surface-modified mesoporous nanoparticles: the method is the same as in Example 1 of the present invention, the difference is that the mesoporous silicon oxide is SBA15, and the surface-modified mesoporous nanoparticles are obtained, denoted as SBA15-Li.

[0066] Preparation of composite electrolyte membrane: Dissolve 0.5g of polyvinylidene fluoride-hexafluoropropylene (Mw=400000) in 5ml of acetone, 0.3263g of lithium bistrifluoromethanesulfonimide, 0.1-0.4g of surface-modified mesoporous nanoparticles (SBA15-Li) and 0.5g polyoxyethylene (Mw=1000000) are dissolved in 10ml acetonitrile, the two kinds of solutions after dissolving are mixed and stirred evenly, then poured on the polytetrafluoroethylene mould of dryness and cast to form film, Vacuum drying to obtain a composite electrolyte membrane, also known as PEO / LiTFSI / PVDF-HFP / surface-modified mesoporous nanopart...

Embodiment 3

[0068] Example 3, PEO / LiTFSI / PVDF-HFP / surface-modified mesoporous nanoparticles (MCM41-Li) gel composite electrolyte

[0069] The composite electrolyte membrane prepared in Example 1 of the present invention was mixed with 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide of 1mol / L lithium trifluoromethanesulfonyl imide Soak in ([EMIm]TFSI) solution for 6 hours to obtain the target gel composite electrolyte membrane (that is, a mesoporous nanoparticle gel composite electrolyte with lithium ion conduction), also known as PEO / LiTFSI / PVDF-HFP / surface modified mesoporous Nanoparticle (MCM41-Li) gel composite electrolyte.

[0070] combine Figure 8 It can be seen that the gel composite electrolyte prepared in this example is compared with the composite electrolyte prepared in Example 1. The ion conductivity of the composite electrolyte in Example 1 of the present invention is 3.29×10 at 20°C. -5 S / cm, the ionic conductivity of the electrolyte in this example is 1.301×...

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
electrical conductivityaaaaaaaaaa
strengthaaaaaaaaaa
electrical conductivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a mesoporous nanoparticle gel composite electrolyte with lithium ion conduction as well as a preparation method and application of the mesoporous nanoparticle gel composite electrolyte. The mesoporous nanoparticle gel composite electrolyte is prepared from surface-modified mesoporous nanoparticles, a polymer, an ionic liquid and a lithium salt, wherein the surface-modifiedmesoporous nanoparticles are obtained by performing surface modification on mesoporous nanoparticles by using a silane coupling agent. The preparation method comprises the steps of mixing the polymer,the lithium salt, the surface-modified mesoporous nanoparticles and an organic solvent, pouring the mixture into a mold, casting to form a film, and carrying out vacuum drying to obtain a composite electrolyte membrane; and soaking the composite electrolyte membrane in an ionic liquid solution of the lithium salt to obtain the mesoporous nanoparticle gel composite electrolyte. The electrolyte disclosed by the invention is high in ionic conductivity and mechanical strength; the preparation method is simple, has the advantage of wide electrochemical window, and can be matched with the existingcommercial positive electrode material, so that the gel composite electrolyte can be used for preparing a lithium ion battery with excellent performance.

Description

technical field [0001] The invention relates to a mesoporous nanoparticle gel composite electrolyte with lithium ion conduction, a preparation method and application thereof, and belongs to the field of gel composite electrolytes. Background technique [0002] Lithium-ion battery has the advantages of large capacity, high working voltage, low pollution and high safety performance, and is a green and environmentally friendly secondary energy battery. Gel composite electrolyte quasi-solid-state lithium-ion battery has a very good application prospect and has attracted attention from all sides. Gel composite electrolyte has also become one of the hot spots in the field of lithium-ion battery research. Gel composite electrolytes have the advantages of high ionic conductivity, flexibility, and good contact with the electrode interface. Compared with composite polymer electrolytes, gel composite electrolytes have higher ionic conductivity and better thermal stability. Compared wi...

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): H01M10/0565H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0565H01M10/4235H01M2300/0085H01M2300/0088Y02E60/10
Inventor 林原张思东解东梅方艳艳周晓文
Owner INST OF CHEM CHINESE ACAD OF SCI