Preparation method of metal lithium negative electrode with hydrophobic protective layer

A hydrophobic protective layer, metal lithium technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of unstable metal lithium negative electrodes, large interface impedance between metal lithium negative electrodes and solid electrolytes, and lithium dendrites. Achieve the effect of reducing production and R&D costs, solving large interface resistance, and enhancing bonding force

Active Publication Date: 2020-07-10
重庆天齐锂业有限责任公司
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  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a method for preparing a metal lithium negative electrode with a hydrophobic protective layer, and its purpose is to solve the problem that the metal lithium negative electrode is extremely unstable in the air, as When the negative electrode of a solid-state lithium battery is used, the interface impedance between the metal lithium negative electrode and the solid electrolyte is too large, and when used as the negative electrode of a lithium-ion battery, there is a technical problem that lithium dendrites are generated during the cycle.

Method used

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  • Preparation method of metal lithium negative electrode with hydrophobic protective layer
  • Preparation method of metal lithium negative electrode with hydrophobic protective layer
  • Preparation method of metal lithium negative electrode with hydrophobic protective layer

Examples

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Embodiment 1

[0036] A method for preparing a metal lithium negative electrode with a hydrophobic protective layer, comprising the following steps:

[0037] Step 1. 1g magnesium stearate and 0.5g polyethylene oxide are mixed to obtain a hydrophobic mixture.

[0038] Step 2. Dissolve the hydrophobic mixture in 25 mL of N-methylpyrrolidone solvent, heat and stir, set the heating temperature to 55° C., and set the stirring speed to 900 r / min until the hydrophobic mixture is completely dissolved to obtain a protective solution.

[0039] Step 3. Spin-coat the protective solution on both surfaces of the ultra-thin metal lithium sheet in dry argon. The spin coating speed was 600 r / min, and the spin coating lasted 60 s. After heating and curing, the heating temperature is 55°C for 30 minutes. A metal lithium negative electrode with a hydrophobic protective layer on both surfaces was obtained, and the thickness of the single-sided hydrophobic protective layer was 5 μm.

[0040] Stability test in ...

Embodiment 2

[0044] A preparation method of a metal lithium negative electrode with a hydrophobic protective layer, weighing 1g magnesium stearate and 0.5g polyvinylidene fluoride-hexafluoropropylene, using 25mL N-methylpyrrolidone solvent as a solvent, and proceeding according to the method in Example 1 Stirring and spin coating to prepare a metal lithium negative electrode with a hydrophobic protective layer on both surfaces, and the thickness of the hydrophobic protective layer on one side is 5 μm.

[0045] Stability test in air according to the method of embodiment 1, the results are shown in the appendix figure 2 , it can be seen that the metal lithium sheet obtained by the method of Example 2 can be placed stably in humid air for 1 min.

[0046] The impedance test was carried out according to the method of Example 1. The impedance of the lithium metal sheet treated by the method of Example 2 was 75 ohms, and the impedance of the lithium metal sheet obtained by coating polyvinylidene...

Embodiment 3

[0049] A preparation method of a metal lithium negative electrode with a hydrophobic protective layer, taking 1g magnesium stearate and 0.5g polydimethylsiloxane, using 25mL n-hexane as a solvent, stirring and spin coating according to the method in Example 1, A metal lithium negative electrode with a hydrophobic protective layer on both surfaces was prepared, and the thickness of the single-sided hydrophobic protective layer was 5 μm.

[0050] Stability test in air according to the method of embodiment 1, the results are shown in the appendix image 3 , it can be seen that the metal lithium sheet obtained by the method of Example 3 can be placed stably in humid air for 5 min.

[0051] The impedance test was carried out according to the method of Example 1, and the impedance of the metal lithium sheet obtained by the method of Example 3 was 120 ohms.

[0052] The charging and discharging test was carried out according to the method of Example 1. The battery assembled from the...

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Abstract

A preparation method of a metal lithium negative electrode with a hydrophobic protective layer comprises the following steps: 1, mixing a hydrophobic compound and a film-forming agent in a mass ratioof (0.5-3): 1 to obtain a hydrophobic mixture; 2, dissolving the hydrophobic mixture in a solvent, and uniformly mixing to obtain a protection solution, wherein the mass percentage of the hydrophobicmixture in the protective solution is 5-50%; 3, coating at least one surface of the ultrathin metal lithium foil with the protective solution in dry inert gas, and then performing curing treatment toobtain a metal lithium negative electrode with a hydrophobic protective layer on at least one surface, wherein the thickness of the single-sided hydrophobic protective layer is 100 nanometers to 10 microns. The technical problems that the metal lithium negative electrode is extremely unstable in air, the interface impedance of the metal lithium negative electrode and the solid electrolyte is too large when the metal lithium negative electrode is used as the negative electrode of the solid-state lithium battery, and lithium dendrites are generated in the circulation process when the metal lithium negative electrode is used as the negative electrode of the lithium ion battery are solved.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for secondary lithium batteries, in particular to a method for preparing a metal lithium negative electrode with a hydrophobic protective layer. Background technique [0002] Lithium-ion batteries have been widely studied and applied in the field of electrochemical energy storage due to their high energy density. At present, the negative electrode of lithium-ion batteries is mainly made of carbon material graphite. The theoretical specific capacity of graphite negative electrode is 372mAh / g, and its energy density has no room for improvement. It is difficult to meet the requirements of many high specific energy storage devices, such as the new Energy vehicles, so the existing lithium-ion batteries have gradually been unable to meet the increasingly high requirements in practical applications. The theoretical specific capacity of metal lithium is as high as 3860mAh / g, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/62H01M4/38H01M10/0525
CPCH01M4/1395H01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 周复王凯萱邹崴赵木刘强朱琴杨洋赵本常
Owner 重庆天齐锂业有限责任公司
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