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A kind of preparation method of lithium metal negative electrode

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

Active Publication Date: 2021-08-27
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 through holes on a lithium metal foil material, the hole diameter is 100 nm, and the hole spacing is 500 nm;

[0020] Step 2: Coat the functional glue on the front and back sides of the lithium metal foil after pore formation;

[0021] Step 3: The lithium metal negative electrode can be obtained by vacuum drying at 50°C, and the thickness of the functional adhesive layer after drying is 100 nm.

[0022] The functional glue is prepared from ceramic powder, lithium salt and binder, and the preparation method includes: step 1: weighing lithium lanthanum zirconium oxygen (LLZO) and lithium perchlorate in 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 are mixed, and after ul...

Embodiment 2

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

[0027] Step 2: Coat the functional glue on the front and back sides of the lithium metal foil after pore formation;

[0028] Step 3: The lithium metal negative electrode can be obtained by vacuum drying at 80°C, and the thickness of the functional adhesive layer after drying is 1 μm.

[0029] The functional glue is prepared from ceramic powder, lithium salt and a binder, and the preparation method includes: step 1: weighing lithium lanthanum zirconium tantalum oxide (LLZTO), hexafluoroarsenic according to 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 hexafluo...

Embodiment 3

[0033] A method for preparing a lithium metal negative electrode, comprising the following steps: step 1: preparing through holes on a lithium metal foil, the hole diameter being 600 nm, and the hole spacing being 1 mm;

[0034] Step 2: Coat the functional glue on the front and back sides of the lithium metal foil after pore formation;

[0035] Step 3: The lithium metal negative electrode can be obtained by vacuum drying at 110°C, 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: weighing lithium lanthanum titanium oxide (LLTO) and lithium tetrafluoroborate in a mass ratio of 20:25:55 (LiBF 4 ), (polyvinylidene fluoride-hexafluoropropylene) copolymer (PVDF-HFP);

[0037] Step 2: Using N-methylpyrrolidone as a solvent, lithium lanthanum titanium oxide (LLTO), lithium tetrafluoroborate (LiBF) 4 ), (polyvinylidene fluoride-hexaf...

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Abstract

The invention discloses a preparation method of a lithium metal negative electrode. Step 1: prepare transparent holes on a lithium metal foil, the hole diameter is 100nm-1mm, and the hole distance is 500nm-1cm; Step 2: apply functional glue on the The positive and negative sides of the lithium metal foil after pore making; step 3: vacuum drying at 50-150°C to obtain the lithium metal negative electrode, and the thickness of the dried functional adhesive layer is 100nm-10μm. The advantages are: by forming a stable solid electrolyte protective layer on the surface of the lithium electrode, it can effectively inhibit the dendrite growth of the lithium metal negative electrode, reduce the side reaction between the electrolyte and lithium metal, and significantly improve the Coulombic efficiency and cycle life of the battery, and The prepared lithium metal negative electrode has better environmental stability, and is still safe and stable even under high humidity conditions. Moreover, the preparation method is basically the same as the current coating process in the 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. Solving the safety problem of lithium-ion batteries is the premise for the wide 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 large-scale application in electric vehicles. security risks. Even in the field of small electronics, there are often reports of some security incidents. The safety of lithium-ion batteries has become a key factor restricting its further development. [0003] At the same time, with the advancement of science...

Claims

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Application Information

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Patent Type & Authority Patents(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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