Preparation method for nickel-manganese-cobalt compound hydroxide and reaction kettle for preparing nickel-manganese-cobalt compound hydroxide

Abstract

The invention relates to a preparation method for nickel-manganese-cobalt compound hydroxide and a reaction kettle for preparing the nickel-manganese-cobalt compound hydroxide. The preparation method comprises the following steps: 1) dissolving a nickel salt, a manganese salt, a cobalt salt and an M-salt to obtain a multi-metal salt solution; and 2) introducing a complexing agent solution, an alkali solution and the multi-metal salt solution into the reaction kettle through a complexing agent tube, an alkali solution tube and a main salt solution tube respectively, heating, stirring, performing nucleation in a system in which pH is between 12.5 and 14, performing nucleus growth in a system in which the pH is between 10 and 12, and adjusting the flow proportion of a main salt solution tube to a branch salt solution tube if a granularity distribution width is detected to be over large in the nucleus growth process in order to control the granularity distribution width. In the preparation method for the nickel-manganese-cobalt compound hydroxide provided by the invention, a nucleating process and the nucleus growth process are separated through control of the two-segment pH values, and narrow-granularity distribution nickel-manganese-cobalt compound hydroxide is obtained finally through adjustment of new crystal nucleuses and a growth speed in the nucleus growth process.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery ternary material precursors, and in particular relates to a preparation method of nickel-manganese-cobalt composite hydroxide with narrow distribution characteristics and a reaction kettle for preparing nickel-manganese-cobalt composite hydroxide. Background technique [0002] In recent years, along with the development of consumer electronics products, electric tools, green and environment-friendly power vehicles, as well as distributed power supply systems based on solar and wind energy, power grid peak regulation, and reserve power, it is strongly expected to have high energy density, high power density and more Research and development of long-life rechargeable and dischargeable energy storage devices. Lithium-ion batteries have the advantages of high energy density, high energy efficiency, long cycle life, no memory effect, fast discharge, low self-discharge rate, wide operating temperature...

AI Technical Summary

Problems solved by technology

At present, the production process of the ternary precursor is mainly a co-current continuous production method, that is, the salt solution of nickel, manganese and cobalt, sodium hydroxide solution, and ammonia water are simultaneously added to the reactor in parallel flow, and the generated ternary precursor is overflowed through the upper part of the reactor. Discharged from the orifice, forming a continuous production of feeding, reacting, and discharging at the same time, but the ternary precursor produced by this production method has a wide particle size distribution, uneven particle size, and poor sphericity

If a ternary precursor with uniform particle size is to be obtained, it can only be obtained through physical classification in the later stage on the basis of continuous production of the ternary precursor. After separating the material with uniform particle size, a large part of the particle size is too small or Materials that are too large cannot be used, resulting in waste, while reducing the yield of ternary precursors and increasing production costs

Images