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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  • Abstract
  • Description
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  • Application Information

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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 sol

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  • Green method for recycling lithium in cathode materials

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[0037] Example 1

[0038] A method for recycling lithium in waste lithium iron phosphate positive electrode material, comprising the following steps:

[0039] (1) The waste lithium iron phosphate positive electrode material of the separated aluminum current collector is mixed with water, and ammonium bicarbonate is added under stirring conditions, so that the ammonium bicarbonate concentration after mixing is 50g / L, and the liquid-solid volume mass ratio (L / kg) is 15; after completing the above operations, the reaction kettle is sealed, and carbon dioxide gas is introduced, and the leaching of lithium in the positive electrode material is realized under the conditions that the pressure of the reaction kettle is 0.2 MPa and the reaction temperature is 15 ° C. Obtain lithium extraction liquid and lithium extraction residue;

[0040] (2) Evaporate the lithium extraction liquid at 60°C to realize the escape of volatile components, synchronously precipitate lithium carbonate, sepa...

Example Embodiment

[0042] Example 2

[0043] A method for recycling lithium in waste nickel-cobalt lithium manganate positive electrode material, comprising the following steps:

[0044] (1) The waste nickel-cobalt lithium manganate positive electrode material of the separated aluminum current collector is mixed with water, and sodium bicarbonate is added under stirring conditions, so that the sodium bicarbonate concentration after mixing is 250g / L, and the liquid-solid volume-to-mass ratio (L / kg) is 5; after completing the above-mentioned operations, the closed reactor is passed into carbon dioxide gas, and the reactor pressure is 0.5MPa, and the reaction temperature is that the leaching of lithium in the positive electrode material is realized under the condition of 40 ° C, and the liquid-solid separation of the material after the reaction is performed. , respectively obtain lithium extraction liquid and lithium extraction residue;

[0045] (2) Evaporate the lithium extraction liquid at 90°C...

Example Embodiment

[0047] Example 3

[0048] A method for recycling lithium in waste lithium cobalt oxide positive electrode material, comprising the following steps:

[0049] (1) The waste lithium cobalt oxide positive electrode material of the separated aluminum current collector is mixed with water, and ammonia water is added under stirring conditions, so that the ammonia water concentration after mixing is 100g / L, and the liquid-solid volume-to-mass ratio (L / kg) is 10; Complete; After the above operation, the reaction kettle was sealed, and carbon dioxide gas was introduced, and the leaching of lithium in the positive electrode material was realized under the conditions that the pressure of the reaction kettle was 0.8 MPa and the reaction temperature was 90 ° C. and lithium extraction residue;

[0050] (2) Evaporate the lithium extraction liquid at 100°C, and when the volatile components escape, precipitate lithium carbonate synchronously, separate the lithium carbonate from the precipitati...

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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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