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Preparation method of lithium metal anode

A lithium metal negative electrode and lithium metal technology, applied in the direction of electrode manufacturing, battery electrodes, electrode current collector coating, etc., can solve the problems of large equipment differences and complexity, and achieve dendrite growth inhibition, side reactions, and good environment The effect of stability

Active Publication Date: 2018-11-16
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electroplating method is required, which is relatively complicated, and is quite different from the current lithium battery industry equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a lithium metal negative electrode, comprising the following steps: Step 1: preparing transparent holes on a lithium metal foil, the diameter of the holes is 100nm, and the hole distance is 500nm;

[0020] Step 2: Coating the functional glue on the front and back of the lithium metal foil after the hole is made;

[0021] Step 3: Vacuum drying at 50° C. to obtain a lithium metal negative electrode, and the thickness of the dried functional adhesive layer is 100 nm.

[0022] The functional glue is prepared from ceramic powder, lithium salt and binder. The preparation method includes: Step 1: Weigh lithium lanthanum zirconium oxide (LLZO) and lithium perchlorate according to a mass ratio of 5:5:90. (LiClO 4 ), polyethylene oxide (PEO);

[0023] Step 2: Using N-methylpyrrolidone as a solvent, lithium lanthanum zirconium oxide (LLZO), lithium perchlorate (LiClO 4 ), polyethylene oxide (PEO) and N-methylpyrrolidone were mixed, and after ultrasonic di...

Embodiment 2

[0026] A method for preparing a lithium metal negative electrode, comprising the following steps: Step 1: preparing transparent holes on a lithium metal foil, the diameter of the holes is 300 nm, and the hole distance is 1 μm;

[0027] Step 2: Coating the functional glue on the front and back of the lithium metal foil after the hole is made;

[0028] Step 3: Vacuum drying at 80° C. to obtain a lithium metal negative electrode, and the thickness of the dried functional adhesive layer is 1 μm.

[0029] The functional glue is prepared from ceramic powder, lithium salt and binder. The preparation method includes: Step 1: Weigh lithium lanthanum zirconium tantalum oxide (LLZTO), arsenic hexafluoride at a mass ratio of 15:15:70 Lithium Oxide (LiAsF 6 ), lithium hexafluoroarsenate (LiAsF 6 );

[0030] Step 2: Using N-methylpyrrolidone as a solvent, lithium lanthanum zirconium tantalum oxide (LLZTO), lithium hexafluoroarsenate (LiAsF 6 ), lithium hexafluoroarsenate (LiAsF 6 ) mix...

Embodiment 3

[0033] A method for preparing a lithium metal negative electrode, comprising the following steps: Step 1: preparing transparent holes on a lithium metal foil, the hole diameter is 600nm, and the hole distance is 1mm;

[0034] Step 2: Coating the functional glue on the front and back of the lithium metal foil after the hole is made;

[0035] Step 3: Vacuum drying at 110° C. can obtain the lithium metal negative electrode, and the thickness of the functional adhesive layer after drying is 3 μm.

[0036] The functional glue is prepared from ceramic powder, lithium salt and binder. The preparation method includes: Step 1: Weigh lithium lanthanum titanyl oxide (LLTO), lithium tetrafluoroborate (LiBF 4 ), (polyvinylidene fluoride-hexafluoropropylene) copolymer (PVDF-HFP);

[0037] Step 2: Using N-methylpyrrolidone as a solvent, lithium lanthanum titanyl oxide (LLTO), lithium tetrafluoroborate (LiBF 4 ), (polyvinylidene fluoride-hexafluoropropylene) copolymer (PVDF-HFP) and N-meth...

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Abstract

The invention discloses a preparation method of a lithium metal anode. The preparation method comprises the following steps: step one, preparing through holes on a lithium metal foil material, whereinthe diameter of the through holes is 100nm to 1mm, and the hole distance is 500nm to 1cm; step two, coating the front surface and the back surface of the lithium metal foil material after hole forming with a functional adhesive; step three, carrying out vacuum drying at 50 to 150 DEG C, thus obtaining the lithium metal anode, wherein the thickness of functional adhesive layers after drying is 100nm to 10mu m. The preparation method disclosed by the invention has the advantages that a stable solid-state electrolyte protective layer is formed on the surface of a lithium electrode, so that dendritic growth of the lithium metal anode can be effectively inhibited, side reaction of electrolyte and metal lithium is reduced, the coulombic efficiency of a battery is remarkably improved, and the cycle life of the battery is remarkably prolonged; the prepared lithium metal anode has better environment stability, and the lithium metal anode is still safe and stable even under a high-humidity condition; the preparation method is basically consistent with a current coating technology in lithium battery industry and is simple and feasible.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and relates to a preparation method of a lithium metal negative electrode. Background technique [0002] In recent years, lithium-ion batteries have been widely used in mobile phones, computers and electric vehicles due to their high energy and power density, excellent cycle performance and no pollution. The solution to the safety problem of lithium-ion batteries is the prerequisite for the widespread application of lithium-ion batteries. Although lithium-ion batteries have achieved great success in small and medium-sized batteries such as mobile electronics, there are still serious problems in the large-scale application of electric vehicles. security risks. Even in the field of small electronics, there are often reports of safety incidents. The safety of lithium-ion batteries has become a key factor restricting its further development. [0003] At the same time, with the advanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/139H01M10/0525
CPCH01M4/0404H01M4/139H01M4/628H01M10/0525Y02E60/10
Inventor 李峥冯玉川何泓材刘京亮熊伟强张博杨帆南策文
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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