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
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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...
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[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...
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[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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