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Lithium metal battery lithium negative electrode surface modification method, and lithium metal battery

A lithium metal battery and surface modification technology, which is applied to the surface modification of lithium metal negative electrodes of lithium metal batteries, in the field of lithium metal batteries, can solve problems such as low Coulombic efficiency, lithium dendrite growth, safety issues, etc., and achieve good repeatability, Higher discharge capacity and lower side reactions

Active Publication Date: 2018-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for surface modification and modification of the lithium metal negative electrode of a lithium metal battery in view of the deficiencies in the prior art, such as low coulombic efficiency, lithium dendrite growth and the safety problems caused by the metal lithium negative electrode.

Method used

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  • Lithium metal battery lithium negative electrode surface modification method, and lithium metal battery
  • Lithium metal battery lithium negative electrode surface modification method, and lithium metal battery
  • Lithium metal battery lithium negative electrode surface modification method, and lithium metal battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The surface modification modification of metal lithium negative electrode comprises the following steps:

[0032] Under the protection of dry argon gas, the polished and polished lithium metal sheet was immersed in the ionic liquid 1-butyl-2,3-dimethylimidazolium tetrafluoroborate ([BMIm]BF 4 ), take it out after 60 minutes of fluorination reaction, wipe off the residual liquid with non-stick wool wipe paper, and form a protective layer rich in lithium fluoride on the surface of the lithium metal sheet, the thickness of the protective layer is 200nm, and the fluorinated Lithium-coated lithium metal anode.

[0033] The SEM picture of the surface of the metal lithium sheet without fluorination treatment is as follows Figure 1a shown by Figure 1a As can be seen, there are obvious cracks and unevenness on the surface of the metal lithium sheet before the fluorination treatment; and the metal lithium sheet (such as Figure 1b Shown) the surface is free of cracks and smoot...

Embodiment 2

[0036] Under the protection of dry high-purity argon gas, the polished and polished lithium metal sheet was immersed in the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIm]BF 4 ), take it out after 10 minutes of fluorination reaction, wipe off the residual liquid with non-stick wool wipe paper, and form a layer of protective layer rich in lithium fluoride on the surface of the lithium metal sheet, the thickness of the protective layer is 30nm, and the fluorinated Lithium-coated lithium metal anode.

[0037] The prepared lithium fluoride-coated metal lithium negative electrode is assembled into a symmetrical battery, the separator is a PP film, and the electrolyte is lithium bistrifluoromethanesulfonylimide (concentration in the electrolyte is 1M) dissolved in a volume ratio of 1 : 1 1,3-dioxolane (DOL) / ethylene glycol dimethyl ether (DME) with the addition of 2 wt% LiNO 3 mixed solution. At a current density of 2mA / cm 2 , The deposition capacity is 1mAh / cm...

Embodiment 3

[0039] Under the protection of dry argon gas, the polished and polished lithium metal sheet was immersed in the ionic liquid 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIm]BF 4 ), take it out after 2 minutes of fluorination reaction, wipe off the residual liquid with non-stick wool wipe paper, and form a layer of protective layer rich in lithium fluoride on the surface of the lithium metal sheet, the thickness of the protective layer is 5nm, and the fluorinated Lithium-coated lithium metal anode.

[0040] The lithium fluoride-coated metal lithium negative electrode is assembled into a full battery as a negative electrode matched with the lithium cobalt oxide positive electrode material; the separator of the full battery is a PP / PE film, and the electrolyte is lithium bistrifluoromethanesulfonylimide ( 1 M in the electrolyte) was dissolved in 1,3-dioxolane (DOL) / ethylene glycol dimethyl ether (DME) at a volume ratio of 1:1 and added 8 wt% LiNO 3 mixed solution. The test...

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Abstract

The invention discloses a lithium metal battery lithium negative electrode surface modification method, and a lithium metal battery. The modification method comprises the following steps: a lithium metal negative electrode is impregnated in or coated with a fluorine-containing ionic liquid in a dry protection gas atmosphere, is fluorinated, and is taken out to make a protection layer rich in lithium fluoride formed on the surface of the metal lithium negative electrode in order to obtain a lithium fluoride coated metal lithium negative electrode. The lithium fluoride protection layer obtainedby surface fluorination is very uniform and dense, and can reduce the consumption of lithium metal and an electrolyte and inhibit the formation of lithium dendrites in order to make the metal lithiumnegative electrode have a high specific discharge capacity, a long cycle life and a good safety, so the stability and the high efficiency of the lithium metal battery in a long cycle process are achieved, use requirements of a high-energy and high-power power battery are met, the industrialization process of the lithium metal battery is facilitated, and lithium metal battery has a wide applicationprospect.

Description

technical field [0001] The invention relates to the field of lithium ion battery negative electrode materials and electrochemistry, in particular to a method for surface modification and modification of lithium negative electrodes of lithium metal batteries and lithium metal batteries. Background technique [0002] With the continuous development of industry, the combustion of traditional fossil fuels produces a large amount of harmful gases and smoke, which not only seriously affects the natural environment and social environment, but also poses a huge threat to the living environment of human beings. Therefore, the development of renewable clean energy has become a top priority. Lithium-ion batteries are widely used in portable electronic products because of their advantages such as wide operating voltage, high discharge capacity, stable discharge, and environmental friendliness. In recent years, with the increasing rise of electric vehicles and large-scale energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/0525H01M10/42H01M50/409
CPCH01M4/134H01M4/1395H01M10/0525H01M10/4235H01M50/409H01M4/04H01M4/366H01M10/052Y02E60/10H01M4/628H01M4/131H01M4/505H01M4/525H01M2300/0045
Inventor 熊训辉王钢杨成浩林志华林璋刘美林
Owner SOUTH CHINA UNIV OF TECH
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