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Green method for recycling lithium in cathode materials

A technology for positive electrode materials and materials, which is applied in the field of lithium in the positive electrode materials of clean and recycled waste lithium ion batteries, can solve the problems that qualified lithium carbonate products cannot be obtained and are not suitable for recycling, and it is difficult to achieve deep purification, small removal difficulty, and transformation high efficiency effect

Active Publication Date: 2017-01-18
北京中科百特科技有限公司
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Problems solved by technology

However, the method is not suitable for reclaiming the lithium in the positive electrode material, because: under this condition, the lithium in the positive electrode material is converted into lithium carbonate, and will not be leached into the solution, and the impurities in the positive electrode material aluminum, iron, Calcium, magnesium, etc. will be leached to the liquid phase together, even if a small amount of lithium is leached, qualified lithium carbonate products cannot be obtained

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  • Green method for recycling lithium in cathode materials

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Effect test

Embodiment 1

[0038] A method for reclaiming lithium in waste lithium iron phosphate cathode material, comprising the steps of:

[0039] (1) Mix the waste lithium iron phosphate positive electrode material separated from the aluminum current collector with water, add ammonium bicarbonate under stirring conditions, so that the concentration of ammonium bicarbonate after mixing is 50g / L, and the volume-to-mass ratio of liquid to solid (L / kg) is 15; after the above operations are completed, the reactor is closed, carbon dioxide gas is introduced, and the leaching of lithium in the positive electrode material is realized under the condition that the pressure of the reactor is 0.2 MPa and the reaction temperature is 15 ° C, and the liquid-solid separation of the material after the reaction is carried out. Obtain lithium extraction solution and lithium extraction residue;

[0040] (2) Evaporate the lithium extraction solution at 60°C, and when the volatile components escape, lithium carbonate is ...

Embodiment 2

[0043] A method for reclaiming lithium in waste nickel-cobalt lithium manganese oxide positive electrode material, comprising the steps:

[0044] (1) Mix the waste nickel-cobalt-lithium-manganese-manganese-oxide positive electrode material separated from the aluminum current collector with water, add sodium bicarbonate under stirring conditions, so that the concentration of sodium bicarbonate after mixing is 250g / L, and the volume-to-mass ratio of liquid to solid (L / kg) is 5; after the above operations are completed, the reactor is closed, carbon dioxide gas is introduced, and the leaching of lithium in the positive electrode material is realized under the condition that the pressure of the reactor is 0.5MPa and the reaction temperature is 40°C, and the liquid-solid separation of the material after the reaction is carried out. , to obtain the lithium extraction solution and the lithium extraction residue respectively;

[0045] (2) Evaporate the lithium extraction solution at ...

Embodiment 3

[0048] A method for reclaiming lithium in spent lithium cobalt oxide cathode materials, comprising the steps of:

[0049] (1) Mix the waste lithium cobaltate positive electrode material separated from the aluminum current collector with water, add ammonia water under stirring conditions, so that the concentration of ammonia water after mixing is 100g / L, and the liquid-solid volume-to-mass ratio (L / kg) is 10; complete After the above operation, the reactor is closed, carbon dioxide gas is introduced, and the lithium in the positive electrode material is leached under the conditions of the reactor pressure of 0.8MPa and the reaction temperature of 90°C, and the liquid-solid separation of the reacted material to obtain the lithium extraction solution respectively. and lithium extraction residue;

[0050] (2) Evaporate the lithium extraction solution at 100°C. When the volatile components are released, lithium carbonate is precipitated synchronously. Lithium carbonate is separated...

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Abstract

The invention provides a green method for recycling lithium in cathode materials, and the method comprises the following steps of 1, using cathode materials containing lithium and mixture of weak base and water as the reaction raw materials, carrying out reaction at the temperature of 5 DEG C-90 DEG C and at the pressure of 0.2 MPa-1.0 MPa, proceeding liquid-solid separation on the materials remaining after the reaction and then obtaining lithium and residue; 2, carrying out postprocessing on the extraction solution of lithium to obtain lithium carbonate. The green method for recycling lithium in cathode materials has simple procedures and green reaction process, during which, the leaching efficiency of lithium is larger than 95 WT%, the purity of lithium carbonate is larger than 98.5 WT%, and the impurity content satisfies national standard GB / T11075 2013.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and relates to a method for recovering lithium in positive electrode materials, in particular to a method for cleanly recovering lithium in positive electrode materials of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have become the main type of power batteries due to their significant advantages of high voltage, large specific energy, light weight, long cycle life and good safety performance. With the development of the new energy vehicle industry, the related new energy vehicle power battery industry will also grow rapidly. At the same time, about 15% of the total power batteries are scrapped every year, and it is expected that the climax of lithium-ion battery scrapping will soon be ushered in. If waste lithium-ion batteries are not disposed of safely, it will cause great harm to the environment and public safety. The current conventional practic...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 张洋郑诗礼李平周宏明张敏王晓健范兵强王宏岩
Owner 北京中科百特科技有限公司
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