Preparation method of single-crystal nickel-cobalt-manganese ternary positive electrode material

Abstract

The invention belongs to the technical field of battery positive electrode materials, and particularly relates to a preparation method of a single crystal type nickel-cobalt-manganese ternary positive electrode material. The preparation method comprises the following steps: S1, preparing a single crystal precursor; s2, carrying out dry mixing granulation on the single crystal precursor, a lithium compound, a doped metal compound, an additive and deionized water by using a stirring granulator, calcining in an oxygen atmosphere, and carrying out air jet pulverization to obtain a large-particle-size single crystal ternary material; and S3, adding lithium carbonate and aluminum nitrate into the obtained single crystal ternary material, and carrying out wet coating in a reaction kettle by adopting a sol-gel method to form a uniform coating layer on the surface. And S4, calcining in an air atmosphere to obtain the high-performance ternary positive electrode material. The preparation method provided by the invention is simple in process and easy in post-treatment, and the prepared material is relatively excellent in charge-discharge efficiency, specific discharge capacity, rate capability and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for batteries, and in particular relates to a preparation method of a single crystal nickel-cobalt-manganese ternary positive electrode material. Background technique [0002] As the most critical part of lithium batteries, cathode materials for lithium batteries will have a large market demand in the next few decades. Among the cathode materials for lithium-ion batteries, ternary cathode materials have the advantages of high energy density and long cycle life. The market demand in the field of power batteries has steadily increased, and it is one of the most promising cathode materials in the market. [0003] At present, the application of new energy electric vehicles still has a series of problems such as range anxiety, safety, service life, convenience of charging and discharging, and continuous cost reduction. Some of these problems can be solved through scale and engineer...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome defects and deficiencies such as high cost of producing low-cobalt ternary positive electrode materials in the prior art, low first-cycle coulombic efficiency, poor cycle stability, and poor rate performance, and provide a modified single-crystal low-cobalt ternary Preparation method of cathode material

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