Preparation method of high-safety ternary composite material

Abstract

The invention belongs to the field of lithium ion battery material preparation, and specifically relates to a preparation method of a high-safety ternary composite material. The preparation process of the preparation method comprises the following steps: firstly mixing a porous metal lithium oxygen compound with a lithium compound to form a solution, adding a ternary material, dispersing uniformly at a high speed to obtain a mixed sizing agent, and then preparing a ternary composite material through sintering, carbonization and an electrochemical lithium supplementing process thereof. The prepared composite material is combined with negative ions of the porous metal lithium oxygen compound by using lithium ions, in the charging and discharging process of batteries, the lithium ions of the porous metal lithium oxygen compound can exchange lithium ions in an electrolyte constantly, so that the safety of the ternary material is maintained, and the transmission rate of the lithium ions is also improved; and moreover, the electrical conductivity of the lithium ions in the lithium compound is high and the lithium ions are coated on the surface of the ternary material so that the probability of occurrence of secondary reaction is reduced, and the safety performance and rate capability are improved.

Description

technical field

[0001] The invention belongs to the field of preparation of lithium ion battery materials, in particular to a high-safety ternary composite material and a preparation method thereof. Background technique

[0002] Ternary materials are widely used in lithium-ion batteries due to their advantages such as high energy density, and are also used in pure electric vehicles, energy storage and other fields. However, the cycle stability and thermal stability of nickel-cobalt-manganese ternary materials are poor, which restricts their wide application. The traditional method to improve the electrochemical stability and thermal stability of ternary materials used in lithium-ion batteries is surface modification, such as surface coating of metal oxides, fluorides, metal phosphates, etc., these coatings can improve the activity The interface stability between the substance and the electrolyte prevents the generation of hydrogen fluoride during charge and discharge. Howe...

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