Ternary precursor with radial spherical top cone structure, positive electrode material and preparation method

Abstract

A ternary precursor with a spherical pyramid-like structure, a positive electrode material, and a preparation method thereof, wherein the cone of the ternary precursor is long strip-shaped primary particles that grow radially, and the top of the sphere is an orderly stacked block-shaped primary particle , and form secondary aggregates; the chemical formula of the ternary precursor is Ni x co y mn (1‑x‑y) (OH) 2 , wherein, 0.3<x<0.9, 0.05<y<0.50, 0.05<1-x-y<0.50. The invention also discloses a preparation method of the ternary precursor with a radial spherical cone-like structure, an anode material and a preparation method. The ternary precursor and the positive electrode material of the present invention have regular morphology and uniform distribution, which is beneficial to the transportation of lithium ions during charge and discharge, and has stable discharge specific capacity, charge and discharge performance and Coulombic efficiency, and good cycle performance. The method of the invention has the advantages of simple process, low reaction temperature and low cost of raw materials, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a ternary precursor, a positive electrode material and a preparation method, in particular to a ternary precursor with a radial-like spherical top pyramid structure, a positive electrode material and a preparation method. Background technique [0002] Nickel-cobalt-manganese-based ternary material Li (Ni x Co y Mn 1-x-y )O 2 The high specific energy battery has become a research hotspot in the field of lithium-ion power battery. However, during the cycle of lithium-ion battery ternary cathode materials, a series of defects are often caused due to changes in various factors, thereby reducing the electrochemical performance of ternary cathode materials. To a certain extent, solve related problems and improve electrochemical performance. [0003] CN107959022A discloses a solvothermal method for preparing a ternary positive electrode material and a preparation method. The precursor is obtained by a hydrothermal method after fi...

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Problems solved by technology

However, this method combines part of the traditional co-precipitation process, and does not strictly control the influencing factors of the reaction process. Through simple reactions and repeated operations to make the crystal grow, the particle distribution of the obtained material is uneven, and the particle size varies greatly. low likelihood of repetition

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