High-voltage nickel-cobalt-manganese ternary precursor and preparation method thereof

Abstract

The invention relates to the field of nickel-cobalt-manganese ternary precursor manufacturing, and in particular, relates to a high-voltage nickel-cobalt-manganese ternary precursor and a preparation method thereof. The preparation method comprises the steps: mixing a nickel-cobalt-manganese ternary metal salt solution, a carbonate solution, a complexing agent solution and a first base solution, carrying out a co-precipitation reaction, and carrying out solid-liquid separation after precipitate reaches a required particle size range to obtain a nickel-cobalt-manganese composite basic carbonate seed crystal; and mixing the nickel-cobalt-manganese ternary metal salt solution, a precipitant solution, the ammonia water solution and a second base solution containing the nickel-cobalt-manganese composite basic carbonate seed crystal, enabling the nickel-cobalt-manganese composite basic carbonate seed crystal to continuously grow, and after the seed crystal reaches the required particle size range, carrying out solid-liquid separation, drying, batch mixing, sieving and demagnetizing to obtain the ternary precursor, wherein the core of the ternary precursor is nickel-cobalt-manganese composite basic carbonate, and the shell of the ternary precursor is nickel-cobalt-manganese composite hydroxide. A battery assembled by a ternary positive electrode material prepared from the precursor shows high discharge capacity, high first coulombic efficiency and excellent rate capability under 4.5 V high cut-off voltage.

Description

technical field [0001] The present invention relates to the technical field of manufacturing nickel-cobalt-manganese ternary precursors, specifically, to a high-voltage nickel-cobalt-manganese ternary precursor and a preparation method thereof, and more specifically, to a high-voltage nickel-cobalt-manganese ternary precursor modified by special structural design. A nickel-cobalt-manganese ternary cathode material precursor for a voltage-type lithium ion battery and a preparation method thereof, a lithium ion battery cathode material, and a lithium ion battery. Background technique [0002] The field of 3C lithium battery (referring to the capacity type lithium ion battery made of nickel cobalt lithium manganese oxide, lithium manganate and other material systems represented by mobile phones, tablets and notebook computers) is the main application market of lithium cobalt oxide. Accelerated commercialization, high cobalt prices, and the continuous emergence of new electronic...

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Problems solved by technology

[0004] However, the nickel-cobalt-manganese ternary cathode material precursor in the prior art is a secondary spherical particle formed by the agglomeration of primary particles of fine grains, which has a dense structure and a low specific surface area.

This nickel-cobalt-manganese ternary cathode material has some problems to be solved, such as fast cycle capacity decay under high voltage conditions, low initial Coulombic efficiency, agglomerated particle pulverization, poor rate performance, poor structural stability, etc., which will limit its application in the field. Applications under high voltage conditions

[0005] Moreover, as the lithium-ion battery prepared by the above-mentioned ternary precursor increases in the number of cycles of the lithium battery at high voltage, secondary particle expansion and shrinkage may cause fragmentation, pulverization, and structural collapse, resulting in increased battery impedance and low activity. The reduction of components will aggravate the side reaction with the electrolyte, cause serious capacity fading, and the rate and cycle performance will drop sharply, which will lead to battery bulging, flatulence, and even fire

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