Solution a with a metal ion concentration of 105g/l was prepared by nickel sulfate, manganese sulfate and ferrous sulfate heptahydrate according to the molar ratio of ni, mn and fe at 6:2:2, and 30% ammonia solution (solution b) and 20% sodium hydroxide solution (solution c) were added at 400rpm and 60℃. A substrate with an ammonia concentration of 8g/l and a ph of 11.8 was prepared, and then the iron was removed by PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field.
Solution a, b and c were added into the reactor at a flow rate of 12l/h, 1.5l/h and 2.8l/h, respectively. The ph of the reaction system controlled by PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC magnetic was 11, and the coprecipitation reaction was carried out. After the particle size of the product reached 18μm, After washing, filtration and drying, the precursor with a specific surface area of 8m2/g and a solid density of 1.2g/cm3 was obtained.
After the precursor was evenly mixed with lithium oxalate and sodium oxalate according to the molar ratio of lithium, sodium and transition metal 0.4:0.6:1.0, the precursor was heated at 5℃/min to 550℃ for 6h, and then heated at 5℃/min to 800℃ for 16h to obtain na cathode material. By controlling the ph of the reaction system to 11.2, the na cathode material was finally prepared. In the sintering process, only sodium carbonate is added, PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC removal of iron to obtain na cathode material.
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