Preparation method of Ni-Co-Al ternary precursor with continuous concentration gradient
A concentration gradient, nickel-cobalt-aluminum technology, applied in chemical instruments and methods, electrical components, nickel compounds, etc., can solve the problems of complex process, poor battery cycle performance, low battery energy density, etc., and achieve simple process and good cycle performance Good, good product stability
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[0028] Example 1
[0029] Prepare solution
[0030] Use deionized water to prepare a 1.5M nickel sulfate solution, a 0.5M cobalt sulfate solution, a 0.2M sodium metaaluminate solution, and a mixed solution of ammonia and sodium hydroxide. The ammonia concentration is 2M and the sodium hydroxide concentration is 4M.
[0031] reaction
[0032] Add 10L of dilute ammonia solution into the 100L reactor, and add the above solutions to the reactor in parallel flow. Adjust the concentration of nickel solution and cobalt solution at the moment the raw materials are added to the reactor: add deionized water to the nickel solution at a flow rate of 0.5L / h, and add cobalt with a concentration of 1.2M to the cobalt solution at a flow rate of 0.5L / h Solution. When the concentration of the nickel solution is 0.1M or the cobalt solution is 1M, stop adding raw materials to the reaction kettle and age for 10 hours. During the whole process, the pH of the system was 11, and the reaction temperature ...
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[0036] Example 2
[0037] Prepare solution
[0038] Use deionized water to prepare 2M nickel sulfate solution, 1M cobalt sulfate solution, 0.5M sodium metaaluminate solution, and a mixed solution of ammonia and sodium hydroxide, where the concentration of ammonia is 3M and the concentration of sodium hydroxide is 6M.
[0039] reaction
[0040] 15L of dilute ammonia solution was added to the 100L reactor, and the above solutions were added to the reactor in parallel flow. Adjust the concentration of nickel solution and cobalt solution at the moment the raw materials are added to the reactor: add deionized water to the nickel solution at a flow rate of 1L / h, and add a 1M cobalt solution to the cobalt solution at a flow rate of 1L / h. When the concentration of the nickel solution is 0.1M or the cobalt solution is 1M, stop adding raw materials to the reaction kettle and age for 12h. In the whole process, the pH of the system was 11.5 and the reaction temperature was 65°C.
[0041] Post-pr...
Example Embodiment
[0044] Example 3
[0045] Prepare solution
[0046] Use deionized water to prepare 1M nickel sulfate solution, 0.3M cobalt sulfate solution, 0.3M sodium metaaluminate solution, and a mixed solution of ammonia and sodium hydroxide, where the concentration of ammonia is 1M and the concentration of sodium hydroxide is 3M .
[0047] reaction
[0048] Add 20L of dilute ammonia solution into the 100L reactor, and add the above solutions to the reactor in parallel flow. Adjust the concentration of nickel solution and cobalt solution at the moment the raw materials are added to the reactor: add deionized water to the nickel solution at a flow rate of 0.1L / h, and add cobalt with a concentration of 1.5M to the cobalt solution at a flow rate of 0.5L / h Solution. When the concentration of the nickel solution is 0.1M or the cobalt solution is 1M, stop adding raw materials to the reaction kettle and age for 24h. In the whole process, the pH of the system was 12 and the reaction temperature was 5...
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