Wide-distribution cobalt-free lithium-rich manganese-based precursor and preparation method thereof

• Main Authors: SUN HAO, CHEN XUDONG, HE BAOYING, YANG LINGWEI
• Format: Patent
• Language: Chinese; English
• Published: 06.06.2023
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

The invention relates to the field of battery materials, in particular to a wide-distribution cobalt-free lithium-rich manganese-based precursor and a preparation method thereof. The preparation method comprises the following steps: preparing a precipitant solution, a complexing agent solution and a metal salt solution; preparing a reaction base solution, wherein the pH value of the reaction base solution is m0; the method comprises the following steps: in an inert atmosphere, introducing a metal salt solution, a precipitator solution and a complexing agent solution into a reaction base solution in a reaction kettle to form a mixed reaction solution, reacting for t0 time to obtain material particles with an initial median particle size, and reducing the pH value of the mixed reaction solution to m1 to enable the material particles to continuously grow; and detecting the real-time median particle size of the material particles, and adjusting the pH value of the mixed reaction liquid according to the real-time