A kind of ternary positive electrode material and preparation method, lithium ion battery
A cathode material and element technology, applied in the field of lithium ion battery electrode materials, ternary cathode materials and preparation fields, can solve the problems of many gaps, many internal gaps, and low compaction density of ternary cathode materials.
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[0038] A method for preparing a ternary positive electrode material provided in an embodiment of the present invention includes the following steps:
[0039] Step 1: Take one of the manganese source and the aluminum source, the nickel source, the cobalt source, the lithium source and the complex, and combine the manganese source and the aluminum source, the nickel source and the cobalt The sources are mixed evenly and prepared into a solution A, the molar amount of the nickel element in the solution A: the molar amount of the cobalt element: the molar amount of the manganese element or the aluminum element is x:y:z, wherein, 0<x≤0.9, 0 <y<0.4, 0<z<0.5; the lithium source is formulated into solution B; the complex is formulated into solution C;
[0040] Step 2: Add the solution B and the solution C dropwise to the solution A at the same time to obtain the solution D, the dropping rate of the solution B and the solution C is 0.1-20ml / min, and the dropping is finished Finally, a...
Embodiment 1
[0068] A preparation method of a ternary positive electrode material, comprising the following steps:
[0069] Step 1: Mix nickel nitrate, cobalt nitrate, and manganese nitrate in a molar ratio of 0.6:0.2:0.2 to prepare 256ml of solution A with a concentration of 0.6M. The lithium nitrate of 1.05 times of the total molar weight of nickel, cobalt and manganese three kinds of ions was prepared into solution B of 64ml. Lactic acid 1.8 times the molar amount of lithium nitrate was prepared into 320ml solution C.
[0070] Step 2: At 50°C, solution B and solution C were simultaneously and uniformly added dropwise to solution A being stirred at a rate of 0.5ml / min to obtain solution D. NaOH was added to solution D to adjust the pH of solution D to 9.5. Solution D was then stirred at 60°C to evaporate the solvent to give a purple sol. Dry at 120°C for 15 h to dry the purple sol into a black foamy powder. Add 2% Al in the molar amount of lithium nitrate to the powder 2 o 3 and mix ...
Embodiment 2
[0073] A preparation method of a ternary positive electrode material, comprising the following steps:
[0074] Step 1: Prepare nickel sulfate, cobalt sulfate, and manganese sulfate at a molar ratio of 0.4:0.2:0.4 to prepare 80ml of solution A with a concentration of 1.0M. 1.15 times the total molar weight of three ions of nickel, cobalt and manganese were prepared into 20ml solution B of lithium sulfate. The citric acid of 1.8 times of the molar weight of lithium sulfate was prepared into 100ml solution C.
[0075] Step 2: At 100°C, solution B and solution C were simultaneously and uniformly added dropwise to solution A being stirred at a rate of 20ml / min to obtain solution D. KOH was added to solution D to adjust the pH of solution D to 8.8. Solution D was then stirred at 80 °C to evaporate the solvent to give a purple sol. Dry at 150°C for 12 hours to dry the purple sol into a black foamy powder. Add 5% MgO in the molar amount of lithium sulfate to the powder and mix eve...
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