A kind of preparation method of ultra-thin lithium strip for lithium metal battery

A technology for lithium metal batteries and lithium strips, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of difficult to control thickness, inability to realize ultra-thin lithium sheet preparation, and large mold reaction loss.

Active Publication Date: 2021-03-05
中科深蓝汇泽新能源(青岛)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently reported solutions also have problems such as large mold loss due to reaction, and difficulty in controlling the thickness under ultra-thin requirements.
None of this traditional or improved method can realize the preparation of ultra-thin lithium flakes (several micrometers or tens of micrometers)

Method used

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  • A kind of preparation method of ultra-thin lithium strip for lithium metal battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Install the 10 micron thick copper foil on the winding machine through the casting roll and the calendering roll, and then control the humidity of the heating kettle and the casting and calendering working chamber below 1%, and the vacuum degree is -0.1MPa, and heat the heating kettle to 180°C, put the lithium ingot into the heating kettle through the transition chamber, open the feeding port after the lithium ingot melts, and use argon to pressurize the heating kettle (5 MPa), so that the molten lithium flows evenly through the casting die. Extended on the copper foil, the die head gap is 200 microns, the winding speed of the copper foil is controlled at 10 m / min, after the cooling roll, the temperature of the composite lithium strip is at 100°C, and the gap of the two-roll calender is adjusted at 20 microns, the lithium strip passes through the gap, and the total thickness is 20 microns after secondary rolling, and the effective thickness of the lithium strip is 10 mic...

Embodiment 2

[0017] Install the 12-micron thick copper foil on the winding machine through the casting roller and calendering roller, then control the humidity of the heating kettle and the casting and calendering working chamber below 1%, and the vacuum degree is above -0.1MPa, and heat the heating kettle to 180°C, put the lithium ingot into the heating kettle through the transition chamber, open the feeding port after the lithium ingot melts, and use argon to pressurize the heating kettle (5 MPa), so that the molten lithium passes through the casting die evenly Flow cast on the copper foil, the die gap is 200 microns, the coiling line speed of the control copper foil is at 10 m / min, after passing through the cooling roll, the temperature of the composite lithium strip is controlled at 100°C, and the temperature of the double-roll calender is adjusted. The gap is 30 microns, the lithium strip passes through the gap, and the total thickness is 30 microns after secondary rolling. The effect...

Embodiment 3

[0019] Install the 40-micron thick laser perforated copper foil on the winding machine through the casting roll and the calendering roll, and then control the humidity of the heating kettle and the casting and calendering working chamber to be below 1%, and the vacuum degree to be above -0.1MPa. Heat the heating kettle to 200°C, add lithium ingots into the heating kettle through the transition chamber, open the feeding port after the lithium ingots are melted, and use argon to pressurize the heating kettle (6MPa), so that the molten lithium passes through the casting die The head is evenly cast onto the copper foil, the gap between the die heads is 300 microns, the winding speed of the copper foil is controlled at 12 m / min, and the temperature of the composite lithium strip is controlled at 100 ° C after passing through the cooling roll, and the double-roller calendering is adjusted The gap of the machine is 90 microns, the lithium strip passes through the gap, and the total th...

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Abstract

The invention relates to a producing method of an ultra-thin lithium flake used by a lithium metal battery. According to the method, a molten lithium ingot is cast onto an ultra-thin copper foil base material, and is supplemented by double-roll cold-pressing to produce an ultra-thin lithium ribbon used by the lithium metal battery. Compared with traditional commercially-available thicker (greater than 100 [mu]m) lithium ribbons, the ultra-thin lithium ribbon produced by the method has the thickness which can be controlled to be between 10 [mu]m and 50 [mu]m, thus increases the volume energy density of the lithium battery, is very suitable for producing flexible energy storage devices such as ultra-thin lithium batteries, can reduces the use amount of lithium, and has good practical significance.

Description

technical field [0001] The invention belongs to the field of lithium negative electrode materials for lithium metal batteries, and relates to a preparation method of an ultra-thin lithium strip. Background technique [0002] Due to the significant advantages of high specific energy and high specific power, lithium metal batteries are considered to be the power battery system with the most development potential; with the development of technology, especially the popularity of wearable electronic devices and the rapid development of new energy vehicles The development requires the battery to be thinner and thinner, and at the same time, it puts forward higher requirements for the energy density of the battery. [0003] Lithium metal anode materials have a very high theoretical capacity (3800 mAh / g), which is an ideal choice for increasing the energy density of batteries. In a system that matches the current lithium-containing cathode materials, there must be a large excess of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/134H01M4/1395H01M10/0525
CPCH01M4/043H01M4/0435H01M4/134H01M4/1395H01M10/0525Y02E60/10
Inventor 崔光磊王庆富徐红霞董杉木许高洁
Owner 中科深蓝汇泽新能源(青岛)有限责任公司
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