Improved reaction kettle for synthesizing high nickel-based NCA ternary material precursor

Abstract

The invention provides an improved reaction kettle for synthesizing a high-nickel-based NCA ternary material precursor. The improved reaction kettle comprises: a kettle body, wherein a kettle cover is connected with the kettle body through a screw; a first motor, a speed reducer and a stirring assembly, wherein the first motor and the speed reducer are arranged on the kettle cover, the stirring assembly is arranged on the rotating shaft of the first motor, an accommodating cavity for accommodating inert gas is formed between the speed reducer and the kettle cover, and a detachable combined stirring paddle is arranged on the stirring assembly; a solid increasing device communicated with the kettle body through a connecting pipeline, wherein a circulating pump is arranged on the connecting pipeline, so that a slurry in the kettle body flows through the solid increasing device and then flows into the kettle body; and a flow guide cylinder arranged on the periphery of the stirring assembly, wherein the top end of the flow guide cylinder is connected with the kettle cover through a plurality of uniformly symmetrical suspension rods. According to the reaction kettle provided by the invention, the NCA high-nickel ternary positive electrode material precursor with high sphericity degree, compact surface and good index can be obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium battery material production equipment, in particular to an improved reaction kettle for synthesizing a high-nickel-based NCA ternary material precursor. Background technique [0002] Lithium-ion batteries have high volume specific energy and mass specific energy, are rechargeable, environmentally friendly and pollution-free, and are widely used in the market. The ternary precursor is an important raw material for the cathode material of lithium-ion batteries, and the cathode materials for lithium-ion batteries currently widely used are obtained by sintering with lithium sources. Therefore, the performance of the ternary precursor also closely affects the performance of the cathode material. Ternary precursor materials are generally prepared by co-precipitation method, and the reaction is regulated by adjusting the reaction temperature, ammonia concentration, pH value, stirring speed, reactor stru...

AI Technical Summary

Problems solved by technology

In the current situation, although the conventional reactor equipment has the ability to prepare NCA ternary precursors, due to the unreasonable design of the reactor, the morphology and physical and chemical indicators of the precursor materials for the synthesis of NCA are limited, and the structure is not dense enough. As a result, after it is sintered into a positive electrode material, the physical and chemical properties, electrical properties, etc. cannot be fully utilized by the current NCA ternary materials.

The reasonable setting of each component in the reactor will affect the convection effect of the slurry in the reactor, resulting in poor mixing effect, high local concentration, and reduced product quality, thus affecting the key indicators of ternary battery materials

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