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Method of inhibiting growth of lithium dendrites through organic compound coating

An organic compound and lithium dendrite technology, which is applied in the field of organic compound coating to inhibit lithium dendrite growth, can solve problems such as dendrite growth, and achieve the effects of prolonging life, improving Coulomb efficiency and discharge capacity, and simple preparation method.

Active Publication Date: 2019-12-17
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can effectively solve the problem of dendrite growth when the existing metal lithium is used as a lithium battery

Method used

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  • Method of inhibiting growth of lithium dendrites through organic compound coating
  • Method of inhibiting growth of lithium dendrites through organic compound coating
  • Method of inhibiting growth of lithium dendrites through organic compound coating

Examples

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Embodiment 1

[0044] A method for inhibiting lithium dendrite growth by coating with an organic compound, comprising the following steps:

[0045] (1) Preparation of organic compound COF-LZU1 rich in Lewis acidic functional groups and lithium-loving elements, the specific steps are as follows:

[0046] (a) 1.3 g of 1,3,5-triformylbenzene was dissolved in 80 ml of 1,4-dioxane, then 1.3 g of 1,4-phenylenediamine was added, and ultrasonically dissolved;

[0047](b) 16 milliliters of acetic acid solutions with a concentration of 3.0mol / L are slowly dripped into the mixed solution obtained in step (a), and then left to stand at room temperature for 72 hours;

[0048] (c) collecting the material obtained in step (b), washing it alternately with dimethylformamide and tetrahydrofuran, centrifuging, and finally drying in an oven at 60°C;

[0049] (2) Mix and grind the organic compound obtained in step (1) with a binding agent and an inert solvent; the ratio of the organic compound to the binding ag...

Embodiment 2

[0053] A method for inhibiting lithium dendrite growth by coating with an organic compound, comprising the following steps:

[0054] (1) Preparation of organic compound COF-LZU1 rich in Lewis acidic functional groups and lithium-loving elements, the specific steps are as follows:

[0055] (a) 1.3 g of 1,3,5-triformylbenzene was dissolved in 80 ml of 1,4-dioxane, then 1.3 g of 1,4-phenylenediamine was added, and ultrasonically dissolved;

[0056] (b) 16 milliliters of acetic acid solutions with a concentration of 3.0mol / L are slowly dripped into the mixed solution obtained in step (a), and then left to stand at room temperature for 72 hours;

[0057] (c) collecting the material obtained in step (b), washing it alternately with dimethylformamide and tetrahydrofuran, centrifuging, and finally drying in an oven at 60°C;

[0058] (2) Mix and grind the organic compound obtained in step (1) with a binding agent and an inert solvent; the ratio of the organic compound to the binding a...

Embodiment 3

[0062] A method for inhibiting lithium dendrite growth by coating with an organic compound, comprising the following steps:

[0063] (1) Preparation of organic compound COF-LZU1 rich in Lewis acidic functional groups and lithium-loving elements, the specific steps are as follows:

[0064] (a) 1.3 g of 1,3,5-triformylbenzene was dissolved in 80 ml of 1,4-dioxane, then 1.3 g of 1,4-phenylenediamine was added, and ultrasonically dissolved;

[0065] (b) 16 milliliters of acetic acid solutions with a concentration of 3.0mol / L are slowly dripped into the mixed solution obtained in step (a), and then left to stand at room temperature for 72 hours;

[0066] (c) collecting the material obtained in step (b), washing it alternately with dimethylformamide and tetrahydrofuran, centrifuging, and finally drying in an oven at 60°C;

[0067] (2) Mix and grind the organic compound obtained in step (1) with a binding agent and an inert solvent evenly, the ratio of the organic compound to the bi...

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Abstract

The invention discloses a method of inhibiting growth of lithium dendrites through organic compound coating. The method comprises the following specific steps of: coating an organic compound on the surface of metal lithium to serve as a protective layer, and directly applying the protective layer to a battery negative electrode. On one hand, the organic compound is rich in Lewis acid functional groups and can interact with anions in an electrolyte, the moving speed of the anions is decreased, and the influence of space charges on the surface of a negative electrode is relieved, so that dendrite growth is inhibited, and on the other hand, lithium ion distribution can be adjusted due to rich lithium-philic elements, the phenomenon that the local lithium ion concentration is too high is reduced, and dendrite growth is inhibited. Therefore, when the coated lithium metal is used in the lithium battery, the coulombic efficiency and the discharge capacity of the battery can be effectively improved, the polarization of the lithium battery is reduced, and the service life of the lithium secondary battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for inhibiting lithium dendrite growth by coating with an organic compound. Background technique [0002] With the overall development of the economy and society, people's living standards have improved significantly, and the requirements for mobile electronic devices, new energy vehicles, etc. are also getting higher and higher. Accordingly, batteries are required to have high energy density and power density. Based on the light weight, extremely high capacity density and the lowest redox potential of metal lithium sheets, metal lithium is regarded as one of the most ideal anode materials for the new generation of batteries. However, lithium metal has many problems in practical applications, such as high reactivity, dendrite growth, and volume expansion. Among them, the growth of dendrites will pierce the battery separator, causing an internal short circ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0568H01M10/42
CPCH01M10/0568H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 康毅进徐英李涛周阳
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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