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Layered composite solid electrolyte as well as preparation method and application thereof

A solid electrolyte and layered composite technology, which is applied in the direction of electrolyte, non-aqueous electrolyte battery, electrolyte immobilization/gelation, etc., can solve the problems of low mechanical strength, low ionic conductivity, large specific surface resistance, etc., and achieve improvement Effects of mechanical strength, improvement of ionic conductivity, and reduction of specific surface resistance

Active Publication Date: 2020-11-13
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a layered composite solid electrolyte and its preparation method to overcome the problems of low ion conductivity, large specific area resistance and low mechanical strength of current polymer solid electrolytes at room temperature

Method used

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  • Layered composite solid electrolyte as well as preparation method and application thereof
  • Layered composite solid electrolyte as well as preparation method and application thereof
  • Layered composite solid electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A layered composite solid electrolyte, the preparation method is as follows:

[0041] 1) Soak 0.5 g of vermiculite in 100 mL of saturated NaCl solution, stir at 120 °C for 24 h, and wash the sodium ion-intercalated vermiculite five times with deionized water. Then 100 mL of 2 mol / L LiCl solution was added, stirred at 120 °C for 24 h, and the lithium-ion intercalated vermiculite was repeatedly washed 5 times with deionized water. Finally, ultrasonically disperse in deionized water for 30 min, and centrifuge at 8000 r / min for 10 min to obtain a vermiculite nanosheet dispersion, in which the concentration of vermiculite nanosheets is 0.1 mg / mL.

[0042] 2) Take 163 mL of the vermiculite nanosheet dispersion in 1) and add it to the suction filtration device, and perform suction filtration at a suction filtration pressure of 0.2 bar, so that the vermiculite nanosheets will slowly self-stack on the basement membrane to obtain layered vermiculite stone frame.

[0043]3) Put ...

Embodiment 2

[0048] A layered composite solid electrolyte, the preparation method is as follows:

[0049] 1) The preparation of the vermiculite nanosheet dispersion is the same as in Example 1;

[0050] 2) Weigh 113 mL of the vermiculite nanosheet dispersion in 1) and add it to a suction filtration device, and perform suction filtration at a suction filtration pressure of 0.2 bar, so that the vermiculite nanosheets will slowly self-stack on the basement membrane to obtain a layered Vermiculite frame.

[0051] 3) Put the layered vermiculite framework obtained in 2) into a vacuum oven at 200°C for heat treatment for 12 h, and then soak in acetonitrile for 2 h for swelling treatment.

[0052] 4) Suction filter the swollen layered vermiculite framework obtained in step 3) in 53 mL of a 0.01% polyethylene oxide-bistrifluoromethanesulfonimide lithium acetonitrile mixed solution, and the suction pressure After that, it was taken out and placed in a glove box filled with argon to heat and dry to...

Embodiment 3

[0054] A layered composite solid electrolyte, the preparation method is as follows:

[0055] 1) The preparation of the vermiculite nanosheet dispersion is the same as in Example 1;

[0056] 2) Weigh 515 mL of the vermiculite nanosheet dispersion in 1) and add it to a suction filtration device, and perform suction filtration at a suction filtration pressure of 0.2 bar, so that the vermiculite nanosheets will slowly self-stack on the basement membrane to obtain a layered Vermiculite frame.

[0057] 3) Put the layered vermiculite framework obtained in 2) into a vacuum oven at 200°C for heat treatment for 12 h, and then soak in acetonitrile for 2 h for swelling treatment.

[0058] 4) Suction filter the swollen layered vermiculite framework obtained in step 3) in 240 mL of 0.01% polyethylene oxide-bistrifluoromethanesulfonimide lithium acetonitrile mixed solution, and the suction pressure After that, it was taken out and placed in a glove box filled with argon to heat and dry to ...

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Abstract

The invention belongs to the technical field of all-solid-state lithium-sulfur batteries, and particularly relates to a layered composite solid-state electrolyte, a preparation method thereof and an application of the layered composite solid-state electrolyte in a solid-state lithium-sulfur battery. The preparation method comprises the steps of firstly, constructing a layered framework by utilizing nanosheets, and then introducing polyoxyethylene-lithium salt between layers of the layered framework to obtain the layered composite solid electrolyte. The invention provides a layered composite solid electrolyte. Compared with a polymer solid electrolyte, the layered composite solid electrolyte prepared by the invention has good room-temperature ionic conductivity, migration number, thin and high mechanical strength and low specific surface resistance, so that excellent electrochemical performance and safety performance can be realized in the application of the solid-state lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state lithium-sulfur batteries, and in particular relates to a layered composite solid-state electrolyte, a preparation method thereof, and an application thereof in solid-state lithium-sulfur batteries. Background technique [0002] The traditional liquid organic electrolyte is flammable and volatile, and it is easy to induce the growth of lithium dendrites to cause short circuit of the battery, which poses a great safety hazard in the process of recycling. At present, solid electrolytes are expected to become ideal substitutes for liquid electrolytes due to their light weight, non-flammability, easy processing, high safety performance, and wide electrochemical window, and are widely used in portable electronic products, electric vehicles and large in the power storage system. [0003] At present, solid electrolytes are mainly divided into inorganic solid electrolytes, organic polymer solid el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/052H01M2300/0094H01M2300/0085Y02E60/10
Inventor 王景涛彭娜武文佳李文鹏
Owner ZHENGZHOU UNIV
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