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A method for preparing lithium strips by continuous electrodeposition

A technology of electrodeposition and lithium strips, which is applied in the field of continuous electrodeposition to prepare lithium strips, can solve problems such as the inability to continuously prepare ultra-thin lithium strips, and achieve the effects of easy storage and transportation, uniform film layers, and simple methods

Active Publication Date: 2018-11-06
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the current technical problem that the ultra-thin lithium strip (thickness<30μm) cannot be continuously prepared, and the ultra-thin metal base strip is conveyed, and the substrate pretreatment, lithium electrodeposition and post-treatment operations are continuously carried out, and finally the obtained Ultra-thin lithium ribbons with a thickness below 30 μm

Method used

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  • A method for preparing lithium strips by continuous electrodeposition
  • A method for preparing lithium strips by continuous electrodeposition

Examples

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Embodiment 1

[0044] A high-purity copper foil strip with a thickness of 10 μm is used as the deposition base strip, and the surface is uniformly coated with a metal lithium layer with a thickness of about 15 μm through pre-treatment, electrodeposition, and post-treatment processes, and finally an ultra-thin lithium strip (such as figure 2shown). The pre-treatment conditions are: 1M sodium hydroxide solution for degreasing, 0.05M dilute nitric acid solution for second immersion activation, the activation here is actually a coarsening process, and the above-mentioned each treatment is washed with high-purity water and quickly dried at 80°C . Electrodeposition conditions are: use 10mA cm -2 The high-current deposition of 5s allows a small amount of lithium to deposit everywhere on the surface of the copper foil substrate, and then enters the 0.1mA·cm -2 The low current lithium electrodeposition, the low current lithium deposition time is 5h, the electrolyte formula is EC, PC, DMC, lithium ...

Embodiment 2

[0046] A high-purity copper foil tape with a thickness of 10 μm is used as the deposition base tape, and the surface is uniformly covered with a metal lithium layer with a thickness of about 8 μm through pretreatment, electrodeposition, and post-treatment processes, and finally an ultra-thin lithium strip (lithium layer) is obtained. thickness is 8 μm). The pre-treatment conditions are: 1M sodium hydroxide solution for degreasing, 0.05M dilute nitric acid solution for second immersion activation, the activation here is actually a coarsening process, and the above-mentioned each treatment is washed with high-purity water and quickly dried at 80°C . Electrodeposition conditions are: use 5.0mA·cm -2 The high-current deposition of 10s allows a small amount of lithium to deposit everywhere on the surface of the copper foil substrate, and then enters the 0.02mA·cm -2 The low-current lithium electrodeposition, the low-current lithium deposition time is 10h, and the electrolyte form...

Embodiment 3

[0048] A high-purity copper foil tape with a thickness of 10 μm is used as the deposition base tape, and the surface is uniformly covered with a metal lithium layer with a thickness of about 28 μm through pre-treatment, electrodeposition, and post-treatment processes, and finally an ultra-thin lithium tape (lithium layer) is obtained. thickness is 28 μm). The pre-treatment conditions are: 1M sodium hydroxide solution for degreasing, 0.05M dilute nitric acid solution for second immersion activation, the activation here is actually a coarsening process, and the above-mentioned each treatment is washed with high-purity water and quickly dried at 80°C . The electrodeposition condition is: use 50mA·cm -2 The high-current deposition of 0.5s allows a small amount of lithium to deposit everywhere on the surface of the copper foil substrate, and then enters the 1mA·cm -2 The low-current lithium electrodeposition, the low-current lithium deposition time is 1h, and the electrolyte form...

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Abstract

The invention relates to a method for preparing metallic lithium strips, in particular to a method for preparing a lithium strip by means of continuous electrodeposition. The method for preparing the lithium strip by means of continuous electrodeposition is provided. The method includes the following steps of a, pretreatment, b, lithium electrodeposition and c, aftertreatment which are conducted in sequence. According to the step of pretreatment, a metallic base strip is subjected to activating treatment. According to the step of lithium electrodeposition, a constant current is adopted for electrodeposition of lithium, the electric current density is controlled to be 5-50mA / cm<2> at first, and deposition lasts for 0.5-10s; and then the electric current density is adjusted to be 0.02-1mA / cm<2>, and deposition time is 1-10h. According to the step of aftertreatment, the electrodeposited metallic strip is subjected to passivation, and accordingly the metallic lithium strip is obtained. The thicknesses of all parts of the metallic lithium strip are uniform and compact, the thickness of a lithium clad layer can be regulated and controlled by regulating the electric current density and plating solution immersion time, lithium strips of various thicknesses can be prepared easily, and ultrathin lithium strips with the thicknesses being smaller than 30 microns can be prepared particularly. The method is simple, cost is low, and the metallic lithium strips can be produced in a large-scale mode.

Description

technical field [0001] The invention relates to a method for preparing lithium metal strips, in particular to a method for preparing lithium strips by continuous electrodeposition. Background technique [0002] Lithium is a light rare metal with very broad application prospects. As one of the important elements to promote the development of science and technology in the 21st century, it is hailed as the "Energy Star" by scientists. Metal lithium ribbons have high energy density and are widely used as anode materials for metal lithium batteries, which have good application prospects. However, at present, traditional commercial lithium metal strips are mainly produced by mechanical processing. The thickness of lithium strips prepared by this technology is basically more than 100 μm, which is not conducive to the miniaturization and thin filmization of batteries. And due to the limitations of lithium toughness and equipment precision, it is difficult to prepare ultra-thin lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/42C25D7/06C25D5/48C25D5/34C25D5/44
CPCC25D3/42C25D5/34C25D5/44C25D5/48C25D7/0692
Inventor 曹乃珍徐川刘强高洁邹崴何霞
Owner TIANQI LITHIUM CORP
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