Method for recycling lithium in lithium battery cathode materials by electrochemical method
A technology of battery positive electrode and positive electrode material, which is used in battery recycling, electrochemical generators, secondary batteries, etc., to achieve high-efficiency recycling, adjustable quality, and a variety of effects
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Embodiment 1
[0029] Step 1: take lithium ferrous phosphate material as the positive electrode sheet, use sodium chloride solution as the electrolyte, and graphite as the negative electrode, apply a 0.1V potential to it in the electrolytic cell for electrochemical recovery, wherein the concentration of the sodium chloride solution is 0.025mol / L, the time is 2h, so that the lithium ions in the positive plate move into the electrolyte solution to form a lithium-containing solution. A lithium-containing solution is obtained. After the experiment finishes, detect the lithium content in the positive electrode sheet, and the migration rate of lithium can reach 95.3%, and detect the lithium content in the lithium-containing solution, which is 1.1g / L (in terms of Li 2 O meter).
[0030] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, to which 280g / L of Na 2 CO 3 , the excess coefficient is 105%, and the precipitation of lithi...
Embodiment 2
[0032] Step 1: Use lithium ferrous phosphate material as the positive electrode sheet, lithium sulfate solution as the electrolyte, and copper sheet as the negative electrode, apply a potential of 0.3V to it in the electrolytic cell for electrochemical recovery, and the concentration of the sodium chloride solution is 0.5mol / L, and the time is 1.5h, so that the lithium ions in the positive electrode move into the electrolyte solution to form a lithium-containing solution. After the experiment finishes, detect the lithium content in the positive electrode sheet, and the removal rate of lithium can reach 99.1%, and detect the lithium content in the lithium-containing solution, which is 1.1g / L (in terms of Li 2 O meter).
[0033] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, to which 280g / L of Na 2 CO 3 , the excess coefficient is 105%, and the precipitation of lithium carbonate is obtained. After the prec...
Embodiment 3
[0035]Step 1: Use lithium cobalt oxide as the positive electrode, lithium hydroxide solution as the electrolyte, and copper sheet as the negative electrode, and apply a potential of 1.05V in the electrolytic cell for electrochemical recovery, wherein the concentration of lithium hydroxide solution is 0.35 mol / L, the time is 2.5h, so that the lithium ions in the positive electrode move into the electrolyte solution to form a lithium-containing solution. After the experiment finishes, detect the lithium content in the positive electrode sheet, and the migration rate of lithium can reach 72.8%, and detect the lithium content in the lithium-containing solution, which is 1.1g / L (in terms of Li 2 O meter).
[0036] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, into which CO 2 , the end point of the control reaction is: Li in the solution 2 Stop feeding CO when the O concentration is about 6g / L and the pH of t...
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