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PEO-based composite solid electrolyte as well as preparation method and application thereof

A solid electrolyte, ethyl technology, applied in electrolyte immobilization/gelation, circuits, secondary batteries, etc., can solve problems such as reducing electrolyte conductivity, improve interface contact, promote dissolution, and increase lithium ion migration number Effect

Pending Publication Date: 2022-03-25
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But simply adding MOFs, the agglomeration between inorganic particles will reduce the conductivity of the electrolyte, and the interface problem between inorganic particles and PEO cannot be ignored. Facing the current mainstream high-voltage electrode materials, it is necessary to widen its electrochemical stability window.

Method used

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  • PEO-based composite solid electrolyte as well as preparation method and application thereof
  • PEO-based composite solid electrolyte as well as preparation method and application thereof
  • PEO-based composite solid electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Preparation of PEO-based composite solid electrolyte CPE20:

[0077] 1. Preparation of ZIF-8 nanoparticles

[0078] 1.0g of Zn(NO 3 ) 2 ·6H 2 O (zinc nitrate hexahydrate) and 4.0 g of 2-methylimidazole were stirred and dissolved in 40 mL of methanol (99.98%, analytically pure) solution, and ultrasonic (300 W) was processed for 25 minutes to obtain a uniformly dispersed transparent and clear solution; The two were mixed, and the mixed solution was stirred at 50° C. and 300 rpm for 4 hours, and then aged at room temperature for 24 hours to complete the precipitation. Centrifuge at 9000rpm for 5min to obtain a white precipitate, wash the white precipitate with methanol, repeat the centrifugation three times, then vacuum-dry at 60°C for 48 hours, take it out and grind it thoroughly and then dry it in vacuum at 100°C for 12 hours to completely remove ZIF-8 The residual moisture in the pores was obtained to obtain ZIF-8 nanoparticles, which were transferred into a glove b...

Embodiment 2

[0084] Preparation of PEO-Based Composite Solid Electrolyte CPE5

[0085]Take the PEO treated in Example 1 and the ZIF-8 nanoparticles and ionic liquid prepared in Example 1, according to the molar ratio of 18:1, weigh 0.881g of PEO and 0.319g of bistrifluoromethanesulfonimide Lithium (LiTFSI), calculated according to 5% of the sum of the mass of PEO and LiTFSI and weighed 0.06g of ZIF-8 nanoparticles, calculated according to 20% of the sum of the mass of PEO, LiTFSI and ZIF-8 and weighed 0.252g of ions liquid. Add LiTFSI to a beaker containing 20ml of analytically pure anhydrous acetonitrile, stir to dissolve fully, then add the ionic liquid, after the ionic liquid is evenly dispersed in the solution, add ZIF-8 nanoparticles, stir for 4 hours until the ZIF-8 After the nanoparticles are uniformly distributed in the solution, add PEO slowly in two batches, and stir while adding; after the addition is completed, stir at a constant temperature of 45°C for 24 hours, and set the s...

Embodiment 3

[0087] Preparation of PEO-Based Composite Solid Electrolyte CPE10

[0088] Take the PEO treated in Example 1 and the ZIF-8 nanoparticles and ionic liquid prepared in Example 1, according to the molar ratio of 18:1, weigh 0.881g of PEO and 0.319g of bistrifluoromethanesulfonimide Lithium (LiTFSI), calculated according to 10% of the sum of the mass of PEO and LiTFSI and weighed 0.12g of ZIF-8 nanoparticles, calculated according to 20% of the sum of the mass of PEO, LiTFSI and ZIF-8 and weighed 0.264g of ions liquid. Add LiTFSI into a beaker containing 20ml of analytically pure anhydrous acetonitrile, stir to dissolve fully, then add ionic liquid, after the ionic liquid is uniformly dispersed in the solution, add ZIF-8 nanoparticles, stir for 4 hours until ZIF-8 After the nanoparticles are uniformly distributed in the solution, add PEO slowly in two batches, and stir while adding; after the addition is completed, stir at a constant temperature of 45°C for 24 hours, and set the s...

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Abstract

The invention discloses a PEO-based composite solid electrolyte as well as a preparation method and application thereof. The electrolyte is composed of PEO, MOFs, a lithium salt and an ionic liquid. The preparation method comprises the following steps: uniformly distributing nano-scale MOFs particles and lithium salt in PEO by adopting a solution mixing method, adding an ionic liquid as a plasticizer into the PEO to form a multi-ion channel network, and finally pouring a PEO mixed solution into a mold for drying to obtain the composite solid electrolyte. The composite solid electrolyte can stably operate normal-pressure and high-pressure batteries at normal temperature, can stably operate in a high-temperature environment in which liquid electrolyte is difficult to operate, and has a relatively great application prospect in the field of new energy solid-state energy storage batteries.

Description

technical field [0001] The invention belongs to the field of solid-state electrolytes in lithium-ion batteries, and in particular relates to a PEO-based composite solid-state electrolyte and its preparation method and application. Background technique [0002] Energy has injected a strong impetus into the development of modern society, plays a vital role in the prosperity and development of the economy and society, and greatly promotes the progress of society. For a long time, traditional fossil energy has been the main source of energy. While creating a large amount of social wealth, it has also caused a series of economic, social and environmental problems. Traditional fossil energy, as a non-renewable energy, faces the growing energy demand, and its exploitable reserves will be exhausted in the near future; in the process of production and use, a large amount of greenhouse gases and harmful wastes will inevitably be generated, which directly threatens For the survival an...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0565C08G83/00C08J3/09C08L71/02C08L87/00
CPCH01M10/0525H01M10/0565C08G83/008C08J3/09C08J3/096H01M2300/0085C08J2371/02C08J2487/00
Inventor 邹汉波张彪陈胜洲杨伟
Owner GUANGZHOU UNIVERSITY