High-voltage type monocrystalline ternary cathode material and preparation method thereof
A cathode material and a single-crystal-like technology, which is applied in the field of high-voltage type single-crystal-like ternary cathode materials and their preparation, can solve the problems of low first-week Coulomb efficiency, reduced material energy utilization rate, large degree of mixing, etc. The effect of high first-week Coulombic efficiency, good single crystal morphology, and high compaction density
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Embodiment 1
[0041] 1) Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water according to the stoichiometric ratio of 1:1:1, and make a mixed solution with a total concentration of metal cations of 2mol / L, and stir to make it fully mixed to obtain a mixed solution. saline solution.
[0042]2) Prepare respectively 5mol / L ammonium oxalate precipitant solution and 8mol / L ammonia solution; then pump the above-mentioned mixed salt solution into the reactor at a rate of 10L / h, while controlling the flow rate of ammonium oxalate solution and ammonia solution Make the pH value of the mixed salt solution 6.5, the ammonium oxalate precipitation dose used is based on the total molar number of metal ions in the oxalate ion and nickel salt, cobalt salt, manganese salt 1:1.5 ~ 1:2, the reaction process control reactor The temperature is 50°C, and the stirring speed is 200r / min; after all the metal cation mixture is pumped into the reactor, it is aged for 20 hours; then the re...
Embodiment 2
[0049] 1) Dissolve nickel acetate, cobalt acetate, and manganese acetate in deionized water according to the stoichiometric ratio of 6:2:2, and make a mixed solution with a total concentration of metal cations of 1.5mol / L, and stir to make it fully mixed evenly to obtain Mix the salt solution.
[0050] 2) Prepare 3mol / L ammonium oxalate precipitant solution and ammonia solution of 6mol / L respectively; The pH value of the mixed salt solution is 6, and the ammonium oxalate precipitation dose used is based on the 1:1.5 to 1:2 total molar number of metal ions in the oxalate ion and nickel salt, cobalt salt, and manganese salt. The reaction process is controlled by the reactor. The temperature is 50°C, and the stirring speed is 300r / min; after all the metal cation mixture is pumped into the reactor, it is aged for 16 hours; then the reacted product is separated by centrifugal filtration to obtain a reaction precipitate, which is washed with deionized water until the precipitate SO...
Embodiment 3
[0057] 1) Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water according to the stoichiometric ratio of 0.85:0.1:0.05, and make a mixed solution with a total concentration of metal cations of 1.8mol / L, and stir to make it fully mixed evenly to obtain Mix the salt solution.
[0058] 2) prepare the ammonium oxalate precipitant solution of 4mol / L and the ammonia solution of 8mol / L respectively; Make the pH value of the mixed salt solution 5.5, the ammonium oxalate precipitation dose used is based on the total molar number of oxalate ions and nickel salts, cobalt salts, and manganese salts, which is 1:1.5 to 1:2. The temperature is 50°C, and the stirring speed is 250r / min; after all the metal cation mixture is pumped into the reactor, it is aged for 18 hours; then the reacted product is separated by centrifugal filtration to obtain a reaction precipitate, which is washed with deionized water until the precipitate SO in 4 2+ Percentage (wt%) is less ...
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