Method for preparing gradient niobium-tungsten-tantalum-doped cobaltosic oxide
A technology of cobalt tetroxide and niobium tungsten is applied in the field of lithium ion batteries, which can solve the problems of uneven distribution of doping elements, uneven precipitation, and easy hydrolysis.
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Embodiment 1
[0026] Prepare a cobalt chloride solution with a concentration of 1mol / L as solution A, and accurately measure 4500L for use; prepare a sodium hydroxide solution with a concentration of 2mol / L, add 0.05 times the volume of ammonia solution with a concentration of 180g / L as solution B ; The hydrogen peroxide solution with a concentration of 5mol / L is prepared as the C solution; the niobium pentachloride absolute ethanol solution with a concentration of 4g / L is prepared as the D solution, according to the formula: D solution volume = (xx × A solution concentration × preparation product requirements niobium doping amount) / (concentration of D solution × percentage of cobalt in cobalt tetroxide), the calculated volume of required D solution is 450L, and accurately measure 450L of absolute ethanol for use;
[0027] When the synthesis reaction starts, determine that the synthesis time is 15 hours, add the D solution to the spare absolute ethanol at a flow rate of 30L / h to be the E sol...
Embodiment 2
[0030] Prepare a cobalt sulfate solution with a concentration of 1.5 mol / L as solution A, and accurately measure 5400 L for use; prepare a sodium hydroxide solution with a concentration of 4 mol / L, add 0.08 times the volume of ammonia solution with a concentration of 180 g / L as solution B ; Prepare a hydrogen peroxide solution with a concentration of 8mol / L as the C solution; prepare a tungsten hexachloride absolute ethanol solution with a concentration of 6g / L as the D solution, according to the formula: D solution volume = (xx × A solution concentration × preparation product requirements Doped tungsten amount) / (concentration of D solution × percentage of cobalt in cobalt tetroxide), the calculated volume of required D solution is 540L, and accurately measure 540L of absolute ethanol for use;
[0031] When the synthesis reaction starts, determine that the synthesis time is 18 hours, add the D solution to the spare absolute ethanol at a flow rate of 30L / h to form the E solution...
Embodiment 3
[0034] Prepare a cobalt nitrate solution with a concentration of 2mol / L as the A solution, and accurately measure 6000L for subsequent use; prepare a sodium hydroxide solution with a concentration of 6mol / L, add 0.1 times the volume and a concentration of 180g / L ammonia solution to be the B solution; Prepare hydrogen peroxide solution with a concentration of 10mol / L as solution C; prepare tantalum pentachloride absolute ethanol solution with a concentration of 8g / L as solution D. Quantity of tantalum) / (concentration of D solution × percentage of cobalt in cobalt tetroxide), the calculated volume of required D solution is 600L, and accurately measure 600L of absolute ethanol for use;
[0035] When the synthesis reaction starts, determine that the synthesis time is 20h, add the D solution to the spare absolute ethanol at a flow rate of 30L / h to form the E solution, and simultaneously add the A solution at a flow rate of 300L / h, the B solution and the C solution In the reaction k...
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