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Functionalized quantum dot composite solid electrolyte membrane and preparation method and application thereof

A solid electrolyte membrane, quantum dot technology, applied in solid electrolytes, non-aqueous electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of limited membrane processing, low ionic conductivity, no high efficiency, low resistance lithium ion transfer channels, etc. Achieving the effect of mild conditions and simple preparation process

Active Publication Date: 2019-11-26
河南景创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of material called Quantum Dot (QDS) was developed by researchers at Los Alamos National Laboratory for better understanding how it works when used on different types of battery systems like LiCoO2 or LMH. It allows for easier manufacturing processes that result in improved energy density compared to previous materials.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency and reliability of producing highly functionalized composite material called LISM® or All-Solid ElectroLithium Battery (ASSLB) without compromizing on either physical security or environmental factors like flammability. Current solutions involve adding solvents into the compositions containing these components, leading to decreased ion conduction rates and reduced cellular conductivities. Additionally, current techniques involving modifying the composition itself may result in impurities from the added chemical agents themselves.

Method used

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  • Functionalized quantum dot composite solid electrolyte membrane and preparation method and application thereof
  • Functionalized quantum dot composite solid electrolyte membrane and preparation method and application thereof
  • Functionalized quantum dot composite solid electrolyte membrane and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The preparation steps of the functionalized quantum dot composite solid electrolyte membrane are as follows:

[0037] 1) Preparation of PEGDGE functionalized carbon quantum dots P-PQD:

[0038]Pipette 540 μL of diethylenetriamine liquid into a 10 mL centrifuge tube, pipette 250 μL of PEGDGE (molecular weight 500) into the above centrifuge tube, shake well and place in an ultrasonic cleaner for 20 minutes to disperse the two substances evenly, then place in The ring-opening reaction was carried out in a constant temperature box at 110°C for 30 minutes. At this time, the epoxy group on the PEGDGE and the amino group on diethylenetriamine underwent a ring-opening reaction, and the PEGDGE molecular chain was successfully grafted onto the diethylenetriamine molecule; weigh 0.9606g of anhydrous Put citric acid in a 10mL centrifuge tube, add 2g of deionized water to it, shake it up, place it in an ultrasonic cleaner for 15 minutes to make it completely dissolve to obtain an aq...

Embodiment 2

[0042] The mass of P-PQD in step 2) in Example 1 was adjusted to 0.05g, and the other steps were the same as in Example 1 to prepare a membrane, and a solid electrolyte membrane with a doping amount of 5% was obtained, which was denoted as Membrane-2. The physical photo is as follows figure 2 As shown (cut into a circular electrolyte membrane with a diameter of 19mm), the fluorescent photo under 365nm ultraviolet light is shown in image 3 As shown, the SEM image of the cross-section is shown in Figure 4 shown.

Embodiment 3

[0044] The mass of P-PQD in step 2) in Example 1 was adjusted to 0.1 g, and the other steps were the same as in Example 1 to prepare a membrane to obtain a solid electrolyte membrane with a doping amount of 10%, which was designated as Membrane-3.

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Abstract

The invention belongs to the technical field of solid electrolyte membranes for all-solid-state lithium batteries, and particularly relates to an application of a functionalized quantum dot compositesolid electrolyte membrane to the field of the all-solid-state lithium batteries. The functionalized quantum dot composite solid electrolyte membrane is prepared by selecting polyethylene oxide (PEO)as a polymer matrix, performing co-mixing and microwave-assisted reaction on polyethylene glycol diglycidyl ether (PEGDGE), diethylenetriamine and a citric acid aqueous solution to prepare PEGDGE functionalized carbon quantum dots as fillers, co-mixing PEGDGE functionalized carbon quantum dot dispersion liquid, Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and the PEO to prepare a membrane casting solution, and performing a casting method. The prepared functionalized quantum dot composite solid electrolyte membrane shows more excellent lithium ion conductivity and mechanical property compared with a traditional PEO electrolyte membrane.

Description

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Claims

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Application Information

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Owner 河南景创新能源科技有限公司
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