有色设备

The ternary precursor of high nickel single crystal with narrow particle size was prepared by discontinuous method. At the beginning of the reaction, nitrogen was introduced into the reactor to prevent the crystal nucleus from being out of control, and then the precursor was oxidized by air to modify its microstructure. The effects of pH, ammonia concentration and air flow rate on the physical properties of the precursor were investigated. The optimum conditions were as follows: pH 11.2, ammonia concentration 0.1~0.15mol/L, air flow rate 0.5~1m³/h. The ternary precursor Ni_0.7Co_0.1Mn_0.2(OH)₂ which prepared under optimal conditions has the characteristics of narrow particle size distribution, high crystallinity, regular primary particle morphology and radiate inside the secondary particle. The first discharge capacity of the cathode material sintered by the precursor and lithium is 180.1mAh/g and the first efficiency is 90.22% under the charge-discharge system of 3.0~4.3V, 0.1C/0.1C.