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Preparation method of lithium-copper composite negative electrode foil piece

A foil and negative electrode technology, applied in the field of preparation of lithium-copper composite negative electrode foil, can solve the problems of inability to realize large-scale production and application, lithium metal power failure, poor mechanical strength, etc., to avoid weak bonding, Improve contact and facilitate the effect of production scale-up

Active Publication Date: 2018-03-20
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that poor mechanical strength is the biggest defect of metal lithium / copper anode foils
The contact force between the lithium metal negative electrode and the copper foil layer is poor, which leads to the power failure of the lithium metal during the working process of the battery, making it impossible to achieve large-scale production and application

Method used

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  • Preparation method of lithium-copper composite negative electrode foil piece
  • Preparation method of lithium-copper composite negative electrode foil piece

Examples

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preparation example Construction

[0017] see attached figure 1 , 2 , the present embodiment provides a preparation method of a lithium-copper composite negative electrode foil. The lithium metal foil is evenly adhered on the surface of the copper foil by using a spaced local pressure enhancement method to form a lithium-copper composite negative electrode foil. The specific method steps as follows:

[0018] 1) Sandwich the copper foil 2 between the lithium metal foils 1 to form a lithium foil / copper foil / lithium foil sandwich layer;

[0019] 2) Use ordinary calendering equipment, start the traction system, make the lithium foil / copper foil / lithium foil sandwich layer pass through the rolling roller 4 to form interval partial pressure on it, the pressure range is 0.05MPa~5MPa, and make a pre-composite lithium foil / copper foil / lithium foil sandwich;

[0020] 3) Pass the pre-composite lithium foil / copper foil / lithium foil sandwich sheet through the rolling roller again, and apply pressure for shaping. The pre...

Embodiment 1

[0026] A preparation method of a lithium-copper composite negative electrode foil, the steps are as follows:

[0027] 1) A 6-micron-thick copper foil is sandwiched between two layers of 50-micron-thick lithium foil to form a sandwich structure.

[0028] 2) Start the traction system so that the lithium foil / copper foil / lithium foil sandwich layer passes through the upper and lower rollers. The upper roller is a concave-convex plate, and the convex shape is circular, with a diameter of 500 microns and a circular interval of 1 mm. Use rolling rollers to form interval partial pressure, and pre-composite lithium foil and copper foil;

[0029] 3) Make the pre-composite lithium foil / copper foil / lithium foil sandwich sheet pass through the rolling roller again, and apply pressure for shaping to obtain the composite lithium metal negative electrode foil).

Embodiment 2

[0031] A preparation method of a lithium-copper composite negative electrode foil, the steps are as follows:

[0032] 1) A 6-micron-thick copper foil is sandwiched between two layers of 50-micron-thick lithium foil to form a sandwich structure.

[0033] 2) Start the traction system so that the lithium foil / copper foil / lithium foil sandwich layer passes through the upper and lower flat pressing plates. The upper flat pressing plate is a concave-convex plate. The pressure plate forms a spaced local pressure enhancement, and pre-composites the lithium foil and the copper foil.

[0034] 3) Make the pre-composite lithium foil / copper foil / lithium foil sandwich sheet pass through the rolling roller again, and apply pressure for shaping to obtain a composite lithium metal negative electrode foil.

[0035] The spaced local pressure enhancement method adopted in the present invention adopts rolling or flat pressing, the surface of the rolling roller or flat pressing plate is a concave-...

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Abstract

The invention relates to a preparation method of a lithium-copper composite negative electrode foil piece. An intermittent local pressure enhancement method is adopted for uniformly adhering lithium metal foil pieces on the surface of a copper foil, and a lithium-copper composite negative electrode foil piece is formed. The preparation method comprises the following concrete steps: clamping the copper foil between the lithium metal foil pieces to form a lithium foil / copper foil / lithium foil sandwich layer; adopting common rolling equipment, starting a traction system, and enabling the lithiumfoil / copper foil / lithium foil sandwich layer to pass through a grinding roller, so as to form intermittent local pressure on the lithium foil / copper foil / lithium foil sandwich layer, wherein the pressure range is 0.05-5MPa, and a pre-compounded lithium foil / copper foil / lithium foil sandwich slice is formed; and enabling the pre-compounded lithium foil / copper foil / lithium foil sandwich slice to pass through the grinding roller again, and applying pressure for shaping, wherein the pressure range is 0.02-5MPa, so that the lithium-copper composite negative electrode foil piece is obtained. The preparation method provided by the invention has the beneficial effects that layer-to-layer contact of the prepared lithium-copper composite negative electrode foil piece is uniform, contact of a lithiummetal negative electrode with the copper foil is further improved, and the problem that the lithium metal foil piece and the copper foil are infirmly bonded is avoided, so that outage of lithium metal in a working process of a battery is prevented.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a lithium-copper composite negative electrode foil. Background technique [0002] At present, the commonly used negative electrode material of lithium battery is graphite material. The theoretical specific capacity of graphite negative electrode is 372mAh / g. The energy density of traditional graphite negative electrode system has little room for improvement. The theoretical specific capacity of metal lithium is 3860mAh / g, and the redox potential is low. , lithium metal has natural advantages as the negative electrode of lithium-ion batteries, and lithium metal negative electrodes are considered by the industry to be the ultimate negative electrode solution for high-energy-density batteries. At present, the metal lithium / copper negative electrode foil using copper foil as current collector and tab is the key research of lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1395H01M10/0525
CPCH01M4/0435H01M4/1395H01M10/0525Y02E60/10
Inventor 刘婧孟繁慧郑涛高凡王欣全周江伍绍中
Owner TIANJIN LISHEN BATTERY
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