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A kind of mesoporous nanoparticle gel composite electrolyte with lithium ion conduction and its preparation method and application

A composite electrolyte and nanoparticle technology, which is applied in composite electrolytes, electrolyte immobilization/gelation, circuits, etc., can solve problems such as low ionic conductivity, low decomposition voltage, and inability to meet large-scale applications

Active Publication Date: 2021-09-10
INST OF CHEM CHINESE ACAD OF SCI
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  • 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

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  • A kind of mesoporous nanoparticle gel composite electrolyte with lithium ion conduction and its preparation method and application
  • A kind of mesoporous nanoparticle gel composite electrolyte with lithium ion conduction and its preparation method and application
  • A kind of mesoporous nanoparticle gel composite electrolyte with lithium ion conduction and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0061] Surface-modified mesoporous nanoparticles synthesized: The synthetic route figure 1 , The following steps: 100mL three-necked flask was added 50mL of toluene and 1.5g of the mesoporous silica MCM41, N 2 After stirring for 60min under an atmosphere was slowly added dropwise 3g MPTMS (mercaptopropyl trimethoxysilane), was stirred for 12h incubation, ethanol, water washed three times at 40 ℃ and dried in vacuo at 40 ℃ 12h, to give thiolated mesoporous silica; N the above product in 30% hydrogen peroxide solution 2 Was stirred under an atmosphere 10H, product was purified by alcohol washing water resulting moist mass; and added to the wet material to 1mol / L lithium nitrate was stirred 6h, after ethanol, washed three times with water, and dried in vacuo to obtain a surface-modified mesoporous nanoparticles, referred to as MCM41 -Li.

[0062] Preparation of a composite electrolyte...

Embodiment 2

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

[0065] Surface-modified mesoporous nanoparticles: the same method as in Example 1 of the present invention, is different to SBA15 mesoporous silica, mesoporous obtain a surface-modified nanoparticles, referred to as SBA15-Li.

[0066] Preparation of a composite electrolyte membrane: 0.5g of polyvinylidene fluoride - hexafluoropropylene (Mw = 400000) was dissolved in 5ml of acetone, 0.3263g of lithium bis (trifluoromethanesulfonyl) imide, 0.1 ~ 0.4g mesoporous surface-modified nanoparticles (SBA15-Li) 0.5g and polyoxyethylene (Mw = 1000000) was dissolved in 10ml of acetonitrile, after the two solutions are mixed and stirred to dissolve uniformly, and then poured into a Teflon mold cast of the film-forming dry static, and dried in vacuo to give the composite electrolyte membrane, also known as PEO / LiTFSI / PVDF-HFP / mesoporous surface-modified nanoparticles (SBA15-Li).

[0067] Comb...

Embodiment 3

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

[0069] Composite electrolyte membrane obtained in Preparation Example 1 will be implemented in 1mol / L of lithium bis (trifluoromethanesulfonyl) imide 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide of the present invention, ([EMIm] TFSI) was soaked 6h, to obtain a gel composite electrolyte membrane of the target (i.e., having lithium ion conductivity mesoporous nanoparticles gel composite electrolyte), also known as PEO / LiTFSI / PVDF-HFP / surface-modified mesoporous nanoparticles (MCM41-Li) gel composite electrolyte.

[0070] Combine Figure 8 Understood, the gel composite electrolyte prepared in this embodiment as compared with the composite electrolyte prepared in Example 1, at 20 ℃ ionic conductivity of the composite electrolyte in Example 1 of the present embodiment of the invention is 3.29 × 10 -5 S / cm, the present embodiment the e...

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Abstract

The invention discloses a mesoporous nanoparticle gel composite electrolyte with lithium ion conduction, a preparation method and application thereof. It is made of surface-modified mesoporous nanoparticles, polymers, ionic liquids and lithium salts; the surface-modified mesoporous nanoparticles are obtained by surface modification of mesoporous nanoparticles using a silane coupling agent. Its preparation method is as follows: after mixing polymer, lithium salt, surface-modified mesoporous nanoparticles and organic solvent, casting it on a mold to form a film, drying in vacuum to obtain a composite electrolyte membrane; then soaking in the ionic liquid solution of lithium salt , that is. The electrolyte of the present invention has high ionic conductivity and mechanical strength; the preparation method is simple, and has the advantages of wide electrochemical window, and can match with existing commercial positive electrode materials, so that a lithium-ion battery with excellent performance can be prepared by using the gel composite electrolyte .

Description

Technical field [0001] The present invention relates to a nanoparticle gel preparation method and the composite electrolyte having lithium ion conductivity Application of a mesoporous, belonging to the field of gel composite electrolyte. Background technique [0002] A lithium ion battery having a large capacity, high operating voltage, less pollution and safety advantages, a green, environmentally friendly energy of the secondary battery. Quasi-solid gel composite electrolyte lithium-ion batteries have a very good prospect, has been the concern from all sides, the gel composite electrolyte also become a hot topic in the field of lithium-ion battery research. Gel composite electrolyte having a high ionic conductivity, flexibility, and good contact with the electrode interface. Compared with the gel composite electrolyte composite polymer electrolyte has higher ion conductivity, better thermal stability, as compared with the inorganic solid electrolyte having a gel composite elect...

Claims

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Application Information

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Patent Type & Authority Patents(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