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Elastomer epoxy resin-based all-solid-state electrolyte as well as preparation method and application thereof

A technology of bulk epoxy resin and epoxy resin, which is applied in the field of elastomeric epoxy resin-based all-solid-state electrolyte and its preparation, can solve the problems of increased battery interface resistance, unfavorable cation transmission, and decreased cycle performance, so as to improve energy efficiency. Density, increase ionic conductivity, improve the effect of mechanical properties

Inactive Publication Date: 2021-02-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, since most of the preparation methods use solvents, the battery must be assembled after the solvent has evaporated completely.
There are three disadvantages in this way of preparing the electrolyte. First, when the electrolyte prepared in this way is in contact with the electrode, there are gaps in the solid-solid contact interface, which will lead to an increase in the interface resistance of the battery and a decrease in cycle performance.
Second, the process of solvent volatilization may cause holes in the electrolyte, which is not conducive to the transport of cations.
Finally, due to the presence of solvents inside the electrolyte, there is a high probability that there will be solvent residues

Method used

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  • Elastomer epoxy resin-based all-solid-state electrolyte as well as preparation method and application thereof
  • Elastomer epoxy resin-based all-solid-state electrolyte as well as preparation method and application thereof
  • Elastomer epoxy resin-based all-solid-state electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Polyethylene glycol diglycidyl ether (PEGDGE), polyetheramine (D2000) and lithium bistrifluoromethanesulfonimide (LiTFSI) were pre-dried in a vacuum oven.

[0033] (2) Add PEGDGE and LiTFSI (mass ratio: 1:0.22) into a screw bottle in a glove box, and stir at a constant temperature of 50°C for 12 hours (200r / min) until the lithium salt is completely dissolved. Similarly, add D2000 and LiTFSI (mass ratio: 1:0.25) into the screw bottle, and stir for 12 hours at a constant temperature of 50°C (rotating at 200r / min) until the lithium salt is completely dissolved.

[0034] (3) Add PEGDGE and D2000 (mass ratio: 2:3) dissolved in LiTFSI in step (2) into a screw bottle, and stir at a constant temperature of 50°C for 0.5h (rotating speed: 200r / min) until the system is evenly mixed.

[0035] (4) Put the mixed solution of step (3) into the transition chamber of the glove box to evacuate, and perform ultrasonic treatment for 0.5 h to remove air bubbles in the mixed solution.

...

Embodiment 2

[0040] (1) Polyethylene glycol diglycidyl ether (PEGDGE), polyether amine (D900) and lithium bistrifluoromethanesulfonimide (LiTFSI) were pre-dried in a vacuum oven.

[0041] (2) Put PEGDGE and D900 (1:1.4) into a screw bottle and add an appropriate amount of lithium bistrifluoromethanesulfonimide (LiTFSI) (the mass ratio of PEGDGE+D900 to LiTFSI is 1:0.1), at 50 Stir at constant temperature for 12 h (rotating at 200 r / min) until the lithium salt is completely dissolved.

[0042] (3) Quickly transfer to vacuum equipment, and pump out the gas in the mixed liquid in the screw bottle as much as possible.

[0043] (4) Pour the mixed liquid after vacuum treatment into the lower part of the mold mentioned above quickly, and put it into a vacuum oven, quickly place the upper part of the mold, and continue to cure for 3 hours under the vacuum condition of 100°C.

[0044] The mold was taken out from the vacuum oven, and the glass plate and release paper were removed to obtain an all-s...

Embodiment 3

[0049] (1) Polyethylene glycol diglycidyl ether (PEGDGE), polyether amine (D900) and lithium bistrifluoromethanesulfonimide (LiTFSI) were pre-dried in a vacuum oven.

[0050] (2) Put PEGDGE500 and D900 (1:1.4) into a screw bottle and add an appropriate amount of lithium bistrifluoromethanesulfonimide (LiTFSI) (the mass ratio of PEGDGE+D900 to LiTFSI is 1:0.4), at 50 Stir at constant temperature for 12 h (rotating at 200 r / min) until the lithium salt is completely dissolved.

[0051] (3) Quickly transfer to vacuum equipment, and pump out the gas in the mixed liquid in the screw bottle as much as possible.

[0052] (4) Pour the mixed liquid after vacuum treatment into the lower part of the mold mentioned above quickly, and put it into a vacuum oven, quickly place the upper part of the mold, and continue to cure for 3 hours under the vacuum condition of 100°C.

[0053] The mold was taken out from the vacuum oven, and the glass plate and release paper were removed to obtain an al...

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Abstract

The invention relates to an elastomer epoxy resin-based all-solid-state electrolyte as well as a preparation method and application thereof, and solves the technical problems that impurities are introduced in the preparation process of an existing cross-linked solid-state polymer electrolyte, a solvent is used, and the working temperature range of the existing thermoplastic polymer solid-state electrolyte is narrow. The electrolyte is prepared from a precursor solution, and is characterized in that the precursor solution is only composed of an epoxy resin monomer, a curing agent and alkali metal salt; alkali metal cations are dissociatedfrom the alkali metal salt under the solvation action of the epoxy resin monomer and the curing agent; and the epoxy resin monomer and the curing agent aresubjected to a cross-linking reaction, and the obtained electrolyte is an elastomer electrolyte self-supporting film, serves as a skeleton of the electrolyte, and is also responsible for ion transmission. The invention also provides a preparation method and application of the electrolyte. The method can be applied to the field of lithium ion battery solid electrolyte.

Description

technical field [0001] The invention relates to a lithium-ion battery solid electrolyte, in particular to an elastomer epoxy resin-based all-solid electrolyte and a preparation method and application thereof. Background technique [0002] With the development of lithium batteries, intelligent electronic devices and electric vehicles have also been developed and upgraded, and people have begun to explore lithium secondary batteries with higher energy density. Lithium metal is an ideal choice for lithium battery anodes due to its high energy density and low reduction potential. However, traditional lithium batteries usually use organic liquid electrolytes, which often have adverse reactions with lithium metal, which limits the use of lithium metal anodes. In addition, there are frequent reports of mobile phones, computers, and automobile power plant explosions in the news. From a safety point of view, it is urgent to study batteries with high safety performance. Traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525H01M10/42C08G59/50C08G59/22C08G59/20
CPCH01M10/0565H01M10/058H01M10/0525H01M10/4235C08G59/5006C08G59/20C08G59/22Y02E60/10Y02P70/50
Inventor 于运花蔡鑫王珅兰金叻杨小平
Owner BEIJING UNIV OF CHEM TECH
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