Method for regenerating cathode material of waste lithium ion battery through electrolysis of molten alkali

A lithium-ion battery, cathode material technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of high cost, easy secondary pollution, complex process flow, etc., achieve high recovery efficiency, is conducive to recovery, metal resources The effect of reuse

Inactive Publication Date: 2019-05-31
NANJING UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for molten alkali electrolysis to regenerate the positive electrode material of waste lithium-ion batteries, which can Simplify the treatment process, avoid secondary environmental pollution, and can directly synthesize high-quality lithium-ion battery cathode materials while recycling waste lithium-ion battery cathode materials, which has significant economic benefits

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  • Method for regenerating cathode material of waste lithium ion battery through electrolysis of molten alkali
  • Method for regenerating cathode material of waste lithium ion battery through electrolysis of molten alkali
  • Method for regenerating cathode material of waste lithium ion battery through electrolysis of molten alkali

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Embodiment 1

[0034] Example 1 is to prepare the regenerated high-quality lithium cobaltate positive electrode material by one-step electrolysis in the mixed molten alkali system of KOH and LiOH by pre-reducing the processed waste lithium ion battery positive electrode lithium cobaltate material, such as figure 1 As shown, the specific steps are:

[0035] (1) Pretreatment of waste lithium-ion battery positive electrode materials: Disassemble the waste lithium cobalt oxide battery after discharge treatment, put it into a reduction tube furnace, pass in argon-hydrogen mixed gas, and control the H 2 Velocity is 50 m 3 / h, control the flow rate of Ar to 50 m 3 / h, after heating up to 200°C and keeping it warm for 2 h, scrape off the treated waste lithium cobaltate powder from the aluminum foil;

[0036] (2) Molten alkali electrolysis: Mix and grind KOH and LiOH at a mass ratio of 3:1, heat to 300 °C and melt, add pre-reduced waste lithium cobaltate powder, and the mass ratio of positive elect...

Embodiment 2

[0043]Example 2 Prepare the regenerated high-quality lithium manganate cathode material by one-step electrolysis in the mixed molten alkali system of KOH and LiOH with the lithium manganate cathode material of the waste lithium ion battery treated in the pre-reduction atmosphere, such as figure 1 As shown, the specific implementation method is:

[0044] (1) Pretreatment of waste lithium-ion battery positive electrode materials: Disassemble the waste lithium manganate battery after discharge treatment, put it into a reduction tube furnace, pass in argon-hydrogen mixed gas, and control H 2 Velocity is 50 m 3 / h, control the flow rate of Ar to 50 m 3 / h, after heating up to 200°C and keeping it warm for 2 h, scrape off the treated waste lithium manganate powder from the aluminum foil;

[0045] (2) Molten alkali electrolysis: KOH and LiOH are mixed and ground at a mass ratio of 3:1, heated to 300 °C and melted, and the waste lithium manganate powder after pre-reduction treatment...

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Abstract

The invention provides a method for regenerating a cathode material of a waste lithium ion battery through electrolysis of molten alkali. The method includes the following steps: 1) mechanically disassembling the waste lithium ion battery, separating a mixture of the cathode material, and reducing the cathode material of the waste lithium ion battery in an argon and hydrogen atmosphere; 2) mixinghydroxide with the molten alkali, taking the pre-reduced cathode material of the waste lithium ion battery in the step 1) as a raw material, and preparing a high-quality lithium ion battery cathode material by a one-step electrolysis method. The method has the advantages that through pre-reduction, the valence state of transition metal elements in the waste lithium battery is reduced, the dissolution quantity of the transition metal elements is increased, and the problem that high-valence cathode materials are insoluble is solved. Compared with the prior art, the method has the advantages thatthe use of hydrogen peroxide and organic acids is avoided, and the recovery rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of waste materials, and in particular relates to a method for regenerating positive electrode materials of waste lithium-ion batteries through molten alkali electrolysis. Background technique [0002] Lithium-ion batteries are one of the most widely used energy storage devices at present, and are widely used in civilian and military fields such as portable electronic devices and new energy vehicles. With the increasing number of users, the application of lithium-ion batteries will have more large potential market. After hundreds of cycles of lithium-ion batteries, the positive electrode material will gradually lose its activity, leading to a decrease in battery capacity and being scrapped. However, most of the existing waste lithium-ion batteries have not been effectively disposed of. These materials that cannot be naturally degraded will give natural Potential hazard to the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/14C25B11/04C25B11/03C22B7/00C22B23/02C22B26/12H01M10/54
CPCY02P10/20Y02W30/84
Inventor 张会刚沈子涵濮军江熠辉
Owner NANJING UNIV
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