Primary and secondary sintering: the uniformly mixed mixture is used in a box-type atmosphere resistance furnace for primary sintering, and two temperature zones are used for primary sintering, that is, 750℃ for 7 hours of sintering, 910℃ for 12 hours of sintering, the heating zone and each stage do the sintering temperature transition, and continue to pass the purified air; Then the semi-finished product is broken, graded and screened, PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field, control particle size d50=10~12um;
Then pour the broken MATERIAL into the reaction kettle for washing, add 3kg material, pour 9kg pure water, stir for 20 minutes, filter, recycle the filtrate PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC processing, and the mass ratio of the material: water =1: Add the ratio of 5 to pure water, and wash and filter 4 times; Finally, the cake was dried for 12 hours and the drying temperature was 120℃.
After drying, the primary sintering MATERIAL was screened, PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC, secondary sintering, the use of box atmosphere resistance furnace, a certain flow of purified air, the main temperature zone temperature set at 930℃, sintering and holding for 8 hours; This process produces high voltage solid density low ph nickel cobalt manganate lithium terpolymer cathode material, ph value is 10.78, compacted density is 3.72g/cm3, using 18650 battery test its electrical performance, 1c g capacity reached 152mah/g, 1c charge and discharge cycle 500 capacity retention rate of 90.1%.
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