Method of quickly synthesizing ternary lithium battery cathode material precursor with double kettles

Abstract

The invention belongs to the field of manufacturing battery materials and particularly relates to a method of quickly synthesizing a ternary lithium battery cathode material precursor with double kettles. Materials are fed into a reaction kettle, and when the liquid level in the reaction kettle is raised to an overflow port, the slurry overflows into a thickener. The bottom of the thickener is connected to a circulating pump. An outlet of the circulating pump is led to interior of the reaction kettle so as to pump the slurry in the thickener back to the reaction kettle. In a filter portion in the thickener, filter bars are regularly arranged and are gathered and connected to a vacuum buffer tank; a part of the slurry is filtered through the filter bars so that granules in the slurry is blocked in the thickener; the condensed slurry is pumped back to the reaction kettle through the circulating pump and is continuously subjected to the reaction, while a mother liquid passing through the filter bars is discharged into the vacuum buffer tank. In the method, due to the structure of large kettle and small kettle, crystal seeds are produced in the small kettle and crystal is grown in the large kettle, so that synthesis time is reduced from more than 180 h to lower than 100 h. In addition, due to large feeding quantity to the reaction system, the method has no loss of solid granules and is high in yield; therefore, synthesis efficiency is increased by 275% and yield is increased to 99.0%.

Description

technical field [0001] The invention belongs to the field of battery material manufacturing, and in particular relates to a method for rapidly synthesizing a precursor of a ternary lithium battery positive electrode material in a single kettle. Background technique [0002] Nickel-cobalt-manganese hydroxide is the precursor of the positive electrode material of the ternary finished battery (nickel-cobalt-manganese oxide). The ternary lithium polymer battery is low in cost, high in capacity (>150mAh / g), and the working voltage is the same as that of the existing electrolyte. Matching, good safety, excellent circulation, high gram capacity and other advantages. It is now widely used in small electrical appliances, electric tools, electric vehicles and other fields. The nickel-cobalt-manganese hydroxide synthesis process mostly uses an independent reactor for reaction. During the reaction process, before the particle size reaches the standard, the material directly overflow...

AI Technical Summary

Problems solved by technology

Gradually, some manufacturers make simple thickening tanks and connect them to the reactor so that the materials overflow from the simple thickening tanks. Since there is no stirring in the thickening tanks, it can play a role in settling particles, which can reduce the loss of particles and properly increase the solid content in the reactor. But the yield of this method is still not good, and the reaction time is long

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