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Method for recovering waste battery lithium foil

A waste battery and recovery method technology, applied in the field of lithium foil recovery, can solve the problems of large surface area, low recovery rate, and poor product quality, and achieve the effects of high metal recovery rate, safe recovery method, and high production efficiency

Active Publication Date: 2015-08-26
南通盛能新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two main problems in the above recycling process: the one is that the recovery rate is low
Because the lithium foil is thin and has a large surface area, the surface is easily oxidized during recycling
Second, the product quality is poor
The content of oxygen and nitrogen in the metal lithium product obtained by the second recovery process is still unstable

Method used

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  • Method for recovering waste battery lithium foil

Examples

Experimental program
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Effect test

Embodiment

[0040] 1) In a drying room with a relative humidity of ≤2%, use a ￠350×400mm extruder with an extrusion force of 50 tons to extrude the bubbly waste lithium foil into a ￠120×1000mm lithium rod.

[0041] 2) Weigh 50Kg￠120×1000mm lithium rod, and add the lithium rod into the molten lithium tank under the protection of argon. Vacuum smelting and filtering are carried out in the lithium melting furnace to remove impurities and most of them. Melting vacuum: ≤1Pa, temperature: 200-220°C, time: 2 hours, filtration accuracy ≤50 microns.

[0042] 3) After the smelting operation is completed, the material in the lithium melting tank is filtered through a pipeline metal filter into a pure lithium tank to remove fine impurities such as lithium oxide and lithium nitride. Temperature: 200-220°C, filtration accuracy ≤2 microns.

[0043] 4) In a fully enclosed casting machine filled with argon, the materials obtained in step 3) are sequentially cast into metal molds of ￠125×300mm.

[0044]...

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Abstract

The invention relates to recovery of a lithium foil and particularly relates to a method for recovering a waste battery lithium foil. The method for recovering the waste battery lithium foil comprises the following steps: (1) performing extrusion forming; (2) performing coarse filtration; (3) performing fine filtration; (4) casting; (5) performing segregation melting; and (6) cutting. The metal lithium product recovered by the invention is high in product purity and is stable and further the metal recovery rate is high. The filtering and melting process is performed under a high vacuum condition, the casting and segregation melting process are performed under an argon protection condition, and the oxygen content and nitrogen content in the metal lithium product can be stably controlled. The recovery method is safe and reasonable. The recovery method is processed in a fully closed device, the filtering and melting process and the segregation melting process are continuously finished at a step and the production efficiency is high.

Description

technical field [0001] The invention relates to the recovery of lithium foil, in particular to a recovery method of waste battery grade lithium foil. Background technique [0002] In recent years, with the continuous development of primary lithium battery applications, battery-grade lithium foil as a negative electrode material is being increasingly used in the primary lithium battery industry. [0003] The lithium foil waste produced in the primary lithium battery production process contains complex impurities. At present, there is no process that can effectively and safely recycle it. The usual recycling methods are: 1) Downgrading. It is doped into industrial grade products for smelting recycling. 2) Smelting and filtering in a drying room or a vacuum furnace to obtain battery-grade lithium metal products. [0004] The above recycling process mainly has two problems: the one is that the recovery rate is low. Because the lithium foil is thin and has a large surface are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12H01M10/54
CPCY02P10/20Y02W30/84
Inventor 许文李文生
Owner 南通盛能新材料科技有限公司
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