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Lithium copper composite belt recovery method

A recycling method and composite strip technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the unreported lithium-copper composite strip recycling method, the omission of the reaction process, etc., to achieve short time consumption and heat conduction Fast, gentle response and controllable effect

Pending Publication Date: 2022-03-08
TIANQI LITHIUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a mild reaction and high purity of recovered metal lithium, but there are omissions in the described reaction process, in which lithium nitride cannot directly react with carbon dioxide
So far, no recycling method for lithium-copper composite tapes has been reported

Method used

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  • Lithium copper composite belt recovery method
  • Lithium copper composite belt recovery method
  • Lithium copper composite belt recovery method

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Disclosed is a lithium-copper composite belt conditioning material. The copper foil of the lithium-copper composite belt is a double-sided photoelectrolytic copper foil with a thickness of 8 μm and a width of 200 mm. The lithium layer has a thickness of 25 μm and a width of 150 mm. The above-mentioned lithium-copper composite strip is placed in a closed space, wherein the ambient humidity of the closed space is controlled at 50-55%, and the N of the closed space 2 , O 2 The mass ratio is 7:1, CO 2 The concentration range is 0.5%; the lithium-copper composite strip will turn black within one minute when it reacts with the mixed gas. The lithium-copper composite strip and the mixed gas first occur as figure 1 The reaction shown in S1-2 generates lithium hydroxide, lithium nitride, and lithium oxide, and the surface of the lithium layer forms a loose and porous structure, which accelerates the nitriding and oxidation of lithium metal, and then the above-mentioned lithium...

Embodiment 2

[0085] Disclosed is a lithium-copper composite belt conditioning material. The copper foil of the lithium-copper composite belt is a double-sided photoelectrolytic copper foil with a thickness of 8 μm and a width of 200 mm. The lithium layer has a thickness of 25 μm and a width of 150 mm. The above-mentioned lithium-copper composite strip is placed in a closed space, wherein the ambient humidity of the closed space is controlled at 65 to 70%, and the N of the closed space is 2 , O 2 The mass ratio is 7:1, CO 2 The concentration range is 0.5%; the lithium-copper composite strip will turn black within one minute when it reacts with the mixed gas. The lithium-copper composite strip and the mixed gas first occur as figure 1 The reaction shown in S1-2 generates lithium hydroxide, lithium nitride, and lithium oxide, and the surface of the lithium layer forms a loose and porous structure, which accelerates the nitriding and oxidation of lithium metal, and then the above-mentioned l...

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Abstract

The invention relates to a lithium-copper composite belt recovery method, and belongs to the technical field of metal recovery. The lithium-copper composite belt recycling method comprises the steps that a lithium-copper composite belt is placed in a closed environment to react with mixed gas to generate white lithium carbonate, the mixed gas is mixed gas of N2, O2, H2O and CO2, the mass ratio of N2 to O2 is (4-9): 1, the humidity of the mixed gas is 10%-90%, and the volume concentration range of CO2 is 0.04%-2%; after more than 90% of metal lithium is converted into lithium carbonate, the lithium carbonate and copper foil are subjected to mechanical crushing, water dissolving, filtering, drying and crystallization, and copper slag and lithium carbonate powder can be obtained; and the metal lithium fully reacts and is converted into lithium carbonate. The recovery reaction of the lithium-copper composite belt is mild and controllable, the safety coefficient is high, the reaction is complete, and the copper base material and the high-purity lithium carbonate powder can be efficiently, simply and conveniently separated out.

Description

technical field [0001] The invention relates to a method for recycling a lithium-copper composite strip, which belongs to the technical field of metal recycling. Background technique [0002] In recent years, with the rapid promotion of new energy vehicles, the rapid expansion of the lithium-ion battery industry has led to rising prices for lithium-ion battery raw materials. Among them, lithium products are restricted by resource shortage and demand at the same time, causing their prices to increase exponentially. Therefore, the recycling of lithium-ion batteries throughout their life cycle is very important. At present, many companies around the world are carrying out recycling projects for decommissioned lithium-ion batteries and have achieved certain results. [0003] As one of the next-generation lithium-ion batteries, the development of lithium metal solid-state batteries is also accompanied by the generation of lithium-copper composite tape waste. Most of the current ...

Claims

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Application Information

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IPC IPC(8): C01D15/08C22B7/00C22B15/00C22B26/12H01M10/54
CPCC01D15/08C22B7/001C22B26/12C22B15/0006H01M10/54Y02P10/20Y02W30/84
Inventor 王广周复邹崴刘强
Owner TIANQI LITHIUM CORP
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