A kind of preparation method of ncma quaternary precursor containing la, ce co-doping

Abstract

The invention discloses a method for preparing a NCMA quaternary precursor containing La and Ce co-doped, comprising: 1) configuring soluble nickel salt, cobalt salt, and manganese salt so that the total metal ion concentration is 1.5mol / L-2.0mol / L solution A; 2) Add lanthanum salt and cerium salt solution to mixed solution A and mix evenly to obtain solution B; 3) Add sodium metaaluminate solution to sodium hydroxide solution at a preset rate to obtain solution C; 4) Add solution B, sodium hydroxide solution, and ammonia solution to the reaction kettle for co-precipitation reaction; 5) When the crystal particle size D50 grows to 6um, pass solution C into the reaction kettle to continue the reaction; 6) The particle size of the product to be overflowed After the D50 grows to 10±1um, the reaction is stopped, and the overflow slurry is aged, washed, dried, and iron-removed to obtain a nickel-cobalt-manganese-aluminum precursor; the present invention prepares high sphericity, NCMA precursor with high crystallinity and high vibration.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode material preparation, and in particular relates to a method for preparing an NCMA precursor containing La and Ce co-doped. Background technique [0002] Currently, the automotive industry is facing increasingly stringent requirements in terms of fuel economy and emission reduction. As a result, much attention has been paid to rechargeable lithium-ion batteries used in electric and electric hybrid vehicles. In lithium-ion batteries, the cathode material plays a vital role. The cathode materials currently occupying the lithium battery market mainly include lithium cobaltate, lithium manganate, ternary materials, and lithium iron phosphate. Ni-rich lithium transition metal oxides are considered to be the most promising candidates because they can increase the specific capacity of Li-ion batteries by increasing the nickel content. Among the ternary materials, Ni provides most of the...

AI Technical Summary

Problems solved by technology

[0003] During the charge and discharge process of high nickel ternary materials, due to Ni 2+ Radius and Li + The radius is similar, there will be some Ni 2+ into the Li layer to form Li + / Ni + Mixed cations hinder the Li + The reversible deintercalation seriously affects the stability and conductivity of the ternary cathode material

Aiming at these problems, the method of doping with appropriate amount of elements is generally adopted. The traditional doping method is to do it through solid phase sintering after the precursor process. Although this method is simple, it will inevitably lead to uneven mixing, resulting in local If the content is too high, the discharge specific capacity will deteriorate significantly, while the content in other positions will be low, and the conductivity will not be improved.

At present, the mainstream feeding method of nickel-cobalt-manganese or aluminum precursors is to inject salt, alkali, ammonia and other materials into the reaction system synchronously from the upper end of the reaction kettle through a single liquid inlet pipe, which will easily cause uneven mixing of materials and local supersaturation of metal ions , and the pH is high, a large number of crystal nuclei are generated

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