Method for treatment on high-voltage Ni-Co-Mn ternary positive electrode material by surface drying method

Abstract

A method for treatment on a high-voltage Ni-Co-Mn ternary positive electrode material by a surface drying method comprises the following steps of firstly, sieving and dispersing a lithium salt, weighing and adding the lithium salt and a Ni-Co-Mn hydroxide into a blending mixer for mixing according to a mole ratio of (1.0-1.2):1, mixing the lithium salt and the Ni-Co-Mn hydroxide to obtain mixed raw powder; secondly, loading and compacting the mixed raw powder in a pot, carrying out sintering in a high-temperature air atmosphere, cooling until the tapping temperature is less than or equal to 80 DEG C, taking a powder body out, and carrying out weak breaking, dispersing and sieving on the powder body in a drying room to obtain a high-dispersion Ni-Co-Mn ternary material substrate; thirdly, weighing and adding the high-dispersion Ni-Co-Mn ternary material substrate and a cladding agent A into a grinding blending mixer for mixing according to a mole ratio of 1:(0.1-0.001), and allowing the high-dispersion Ni-Co-Mn ternary material substrate and the cladding agent to be in mixed contact, thereby obtaining a mixed material; loading the mixed material in the pot, cooling after sintering the mixed material in the high-temperature air atmosphere to a solid phase until the tapping temperature is less than or equal to 80 DEG C, taking the powder body out, and carrying out sieving to obtain the high-voltage Ni-Co-Mn ternary material. According to the method, the high-voltage Ni-Co-Mn ternary positive electrode material which has the characteristics of high capacity, high cycle, high temperature and favorable safety can be prepared.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a high-voltage nickel-cobalt-manganese ternary positive electrode material with a dry surface treatment. Background technique [0002] Nickel-cobalt-manganese (NCM) ternary materials have attracted extensive attention from researchers because of their high capacity, good safety, and low price. In order to meet the needs of high-energy batteries, researchers have proposed many modification ideas for the surface modification of high-voltage nickel-cobalt-manganese ternary materials. At present, wet coating is the most widely used coating of ternary materials, but its process is complicated, high cost, poor process controllability, high requirements for coating equipment, and wet processing has an impact on the capacity of ternary materials , The degree of improvement in high temperature and safety is controversial in the industry; the use of si...

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Problems solved by technology

At present, wet coating is the most widely used coating of ternary materials, but its process is complicated, high cost, poor process controllability, high requirements for coating equipment, and wet processing has an impact on the capacity of ternary materials , the degree of improvement in high temperature and safety is controversial in the industry; adopting a simple and effective coating method to solve the problem of surface instability of nickel-cobalt-manganese ternary materials has become a bottleneck in the lithium battery industry

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