Metal lithium material with artificially constructed polymer SEI film and preparation and application thereof

A technology of polymer and metal lithium, applied in structural parts, active material electrodes, secondary battery manufacturing and other directions, can solve the problems of lithium dendrite growth and cracking, and achieve inhibiting the generation of lithium dendrites, the preparation method is simple, and the production The effect of mature technology

Active Publication Date: 2020-07-14
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention only uses physical properties (strength and elasticity of the SEI film) to suppress lithium dendrites. As the battery cycle progresses, this SEI film will rupture quickly, so that lithium dendrites will continue to grow

Method used

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  • Metal lithium material with artificially constructed polymer SEI film and preparation and application thereof
  • Metal lithium material with artificially constructed polymer SEI film and preparation and application thereof
  • Metal lithium material with artificially constructed polymer SEI film and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of commercial Kevlar fiber is adopted as raw material to obtain a kind of dispersion liquid in order to be coated on the lithium metal surface, the preparation method that forms one deck polymer artificial SEI film after solvent volatilization, comprises the following steps:

[0031] 1) Add 1.0g of Kevlar fiber and 1.5g of potassium hydroxide to 500mL of anhydrous dimethyl sulfoxide, stir and dissolve for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;

[0032] 2) Take 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1) and add 60 mL of deionized water to obtain a large amount of floc, and filter the Kevlar fiber into a film by vacuum filtration, And wash with 100mL of anhydrous dimethyl sulfoxide, remove the membrane and dissolve it in 30mL of anhydrous dimethyl sulfoxide, stir at 80°C for 5 days to obtain a pure Kevlar nanofiber dispersion;

[0033] 3) Take 100 μL of the pure Kevlar nanofiber dispersion obtained in...

Embodiment 2

[0042]1) Add 2.0g of Kevlar fiber and 1.5g of potassium hydroxide to 100mL of anhydrous dimethyl sulfoxide, stir and dissolve for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;

[0043] 2) Take 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1) and add 90 mL of deionized water to obtain a large amount of floc, and filter the Kevlar fiber into a film by vacuum filtration. And wash with 100mL of anhydrous dimethyl sulfoxide, remove the membrane and dissolve it in 10mL of anhydrous dimethyl sulfoxide, stir at 30°C for 2 days to obtain a pure Kevlar nanofiber dispersion;

[0044] 3) Take 10 mL of the pure Kevlar nanofiber dispersion obtained in the above steps, drop it onto a metal lithium strip with a thickness of 100 μm, and use a spatula to coat the dispersion with a thickness of 200 μm, and then heat it to 90° C. By drying the dimethyl sulfoxide solvent, a lithium metal material with a polymer artificial SEI film is obtained.

Embodiment 3

[0046] 1) Add 2.0g of Kevlar fiber and 1.5g of potassium hydroxide to 100mL of anhydrous dimethyl sulfoxide, stir and dissolve for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;

[0047] 2) Take 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1) and add 90 mL of deionized water to obtain a large amount of floc, and filter the Kevlar fiber into a film by vacuum filtration. And wash with 100mL of anhydrous dimethyl sulfoxide, remove the membrane and dissolve it in 10mL of anhydrous dimethyl sulfoxide, stir at 70°C for 2 days to obtain a pure Kevlar nanofiber dispersion

[0048] 3) Take 100 μL of the pure Kevlar nanofiber dispersion obtained in the above steps, drop it on a metal lithium sheet with a thickness of 500 μm, and then heat it on a heating platform to 50° C. to dry the dimethyl sulfoxide solvent to obtain a polymerized Lithium metal materials for artificial SEI films.

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Abstract

The invention relates to a metal lithium material with an artificially constructed polymer SEI film and preparation and application thereof. Commercial Kevlar fibers are used as a raw material to prepare a pure Kevlar nanofiber dispersion liquid, the surface of a lithium substrate is coated with the pure Kevlar nanofiber dispersion liquid, and a polymer artificial SEI film is formed after a solvent volatilizes. Compared with other lithium metal modification methods, the method has the advantages that since the raw materials are aramid fibers produced by Dupont Company, the production technology is mature, the method can be used for large-scale production of polymer artificial SEI films, and the preparation method is simple; the SEI film constructed by the invention is high in strength, hascertain flexibility, is of a reticular structure with rich amide functional groups, and can effectively inhibit the generation of lithium dendrites in the intercalation / deintercalation process of lithium ions.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and relates to a lithium metal material with an artificially constructed polymer SEI film and its preparation and application. Background technique [0002] Lithium metal batteries (lithium-sulfur batteries, lithium-oxygen batteries, solid-state batteries) are one of the commonly used secondary batteries, with high energy density and excellent cycle performance, and are currently the mainstream choice for electric vehicle batteries. The commonly used anode material is graphite, which has a low theoretical capacity of only 375mAh g -1 , which greatly limits the development of the electric energy storage industry represented by electric vehicles. In order to meet the needs of society, it is imminent to develop next-generation secondary batteries with high energy density. [0003] At present, dendrites will form in the metal Li negative electrode during the charge-discharge cycle, ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525H01M10/04
CPCH01M4/134H01M4/382H01M4/628H01M10/0427H01M10/0525H01M2004/027Y02E60/10Y02P70/50
Inventor 闵宇霖郑帅时鹏辉范金辰徐群杰朱晟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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