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Metal lithium negative electrode piece, preparation method thereof and metal lithium secondary battery

A metal lithium and negative electrode technology, which is applied in the repair/maintenance of secondary batteries, lithium batteries, battery electrodes, etc., can solve problems such as the inability to completely eliminate the influence of lithium dendrite growth, and improve safety performance and cycle performance. Effect of large actual surface area and reduced risk of short circuit

Inactive Publication Date: 2018-01-12
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above preparation methods of lithium metal negative electrodes can inhibit lithium dendrites to a certain extent, but cannot completely eliminate the influence of lithium dendrite growth, and the safety performance and cycle performance of metal lithium secondary batteries still need to be further improved.

Method used

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  • Metal lithium negative electrode piece, preparation method thereof and metal lithium secondary battery
  • Metal lithium negative electrode piece, preparation method thereof and metal lithium secondary battery
  • Metal lithium negative electrode piece, preparation method thereof and metal lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Press the 500μm metal lithium foil and the copper grid current collector together;

[0050] Dissolve PEO in acetonitrile to make a polymer electrolyte solution with a concentration of 1%, add Super P (the mass ratio of Super P to PEO is 1:99) into the polymer electrolyte solution and stir evenly, and spread the mixed solution on the set On the fluid metal lithium layer, the solvent is evaporated to dryness, and a composite conductive film with a thickness of 0.1 μm is formed on the surface of the metal lithium layer to obtain a metal lithium negative electrode sheet.

[0051] The positive electrode sheet is prepared by a conventional method. The positive electrode active material on the positive electrode sheet is lithium iron phosphate, and the metal lithium negative electrode sheet, lithium iron phosphate positive electrode sheet, and separator are wound by a winding process, and a lithium battery is made with a liquid electrolyte.

Embodiment 2

[0055] Coating a layer of 1 μm metal lithium layer on the surface of copper foil by vacuum evaporation method;

[0056] PVDF-HFP was dissolved in N,N-dimethylformamide (DMF) to make a polymer electrolyte solution with a concentration of 10%, and carbon nanotubes (the mass ratio of carbon nanotubes to PVDF-HFP was 99:1 ) was added into the polymer electrolyte solution and stirred evenly, the mixed solution was coated on the metal lithium layer of the current collector, the solvent was evaporated to dryness, and a composite conductive film with a thickness of 1 μm was formed on the metal lithium surface to obtain a metal lithium negative electrode sheet.

[0057] The positive electrode sheet is prepared by a conventional method. The positive electrode active material on the positive electrode sheet is lithium iron phosphate, and the metal lithium negative electrode sheet, lithium iron phosphate positive electrode sheet, and separator are laminated by a lamination process, and the...

Embodiment 3

[0061] A metal lithium layer of 5 μm is plated on the surface of the etched copper foil by vacuum evaporation method;

[0062] Dissolve the polycarbonate polymer in acetone to make a polymer electrolyte solution with a concentration of 50%, add acetylene black (the mass ratio of acetylene black to polycarbonate polymer is 50:50) into the polymer electrolyte solution and stir evenly, Coating the mixed solution on a substrate with a smooth surface, evaporating the solvent to obtain a composite film with a thickness of 100 μm, and pressing the composite film on the surface of the lithium metal layer by rolling to obtain a lithium metal negative electrode sheet.

[0063] The positive electrode sheet is prepared by a conventional method. The positive electrode active material on the positive electrode sheet is lithium iron phosphate, and the metal lithium negative electrode sheet and the lithium iron phosphate positive electrode sheet are laminated with a solid electrolyte to form a...

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Abstract

The invention discloses a metal lithium negative electrode piece, a preparation method thereof and a metal lithium secondary battery. The metal lithium negative electrode piece comprises a current collector, wherein a metal lithium layer is formed on the current collector; a composite conductive film is formed on the metal lithium layer. The preparation method of the metal lithium negative electrode piece comprises the following steps: laminating a metal lithium foil and the current collector together, or plating lithium metal on the surface of the current collector; dissolving a polymer electrolyte in a solvent to prepare a polymer electrolyte solution; adding a conductive agent into the polymer electrolyte solution; stirring uniformly and then coating a mixed solution on the metal lithium layer; after evaporating the solvent, forming the composite conductive film on the surface of the metal lithium layer to obtain the metal lithium negative electrode piece; or, coating the mixed solution on a substrate and evaporating the solvent to obtain the composite conductive film, laminating the composite conductive film on the surface of the metal lithium layer to form the composite conductive film and obtain the metal lithium negative electrode piece. The metal lithium negative electrode piece provided by the invention can inhibit lithium dendrites, prevent batteries from being short-circuited, and improve safety performance and cycling performance of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium metal negative electrode sheet and a preparation method thereof, and a lithium metal secondary battery using the lithium metal negative electrode sheet. Background technique [0002] Lithium-ion battery is a rechargeable battery composed of positive electrode, negative electrode, separator and electrolyte or electrolyte. It is widely used in mobile communication equipment, notebook computers, digital Electronic products such as cameras, and gradually play a role in the field of electric vehicles and energy storage. At present, graphite is mostly used as the anode material of lithium-ion batteries. Due to the limited theoretical specific capacity of graphite, as the market demands higher and higher energy density of batteries, metallic lithium anodes have been extensively studied as a negative electrode with high theoretical specific capacity. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/42H01M10/052
CPCY02E60/10
Inventor 赵伟李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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