Ternary positive electrode material complex precursor for lithium battery and preparation method of ternary positive electrode material complex precursor

Abstract

The invention provides a ternary positive electrode material complex precursor for a lithium battery and a preparation method of the ternary positive electrode material complex precursor. The method comprises the steps of adding a nickel-cobalt-manganese ion water solution prepared at a stoichiometric ratio to a water solution containing lactic acid bacteria and coenzyme, adding sugars, sealing and then standing in a thermotank of 45 DEG C for 12h; taking out a product and adjusting the pH to an appropriate range through adding a precipitant and slowly stirring under nitrogen protection to form a precipitate; and filtering and drying the precipitate to obtain the ternary positive electrode material precursor. According to the ternary positive electrode material complex precursor, the defects that ammonia or oxalic acid is directly added as a complexing agent, is difficult to evenly combine with metal particles and is harmful to the human body and the environment in existing high-nickelternary material preparation are overcome; the sugars are decomposed into lactic acid through slow fermentation of the lactic acid bacteria to form a slow release effect; and the prepared ternary positive electrode material precursor is uniform and controllable in granularity, the preparation process is environment-friendly and pollution-free, raw materials are simple and available and the preparation method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of lithium ion positive electrode materials, in particular to a complex precursor of a lithium battery ternary positive electrode material and a preparation method thereof. Background technique [0002] Nickel-cobalt lithium manganate ternary material is a new type of lithium-ion battery cathode material developed in recent years, especially high-nickel ternary material, which has the advantages of high capacity and good safety performance. With the development of electric vehicles, lithium-ion batteries have been rising all the way, and have now become the main source of power for electric vehicles. There are various types, each with its own characteristics, and it will be difficult to be replaced by other power sources for a long time in the future. [0003] At present, according to the different molar ratios of nickel, cobalt, and manganese in the chemical formula, there are many high-nickel types. For example, t...

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Problems solved by technology

[0008] Aiming at the defect that ammonia water or oxalic acid is used as a complexing agent in the preparation of existing high-nickel ternary materials, it is difficult to uniformly combine with metal particles, and it is harmful to the human body and the environment. The present invention proposes a lithium battery ternary cathode material complexation precursor The body and its preparation method, through the slow fermentation of lactic acid bacteria, sugars are decomposed into lactic acid, forming a slow release effect, making the complexation of lactic acid and metal ions more uniform, the particle size of the precursor is easier to control, and the reaction process does not produce harmful gases to the human body