Preparation method of low-alkali air-blocking high-nickel ternary lithium battery electrode material

Abstract

The invention provides a preparation method of a low-alkali air-blocking high-nickel ternary lithium battery electrode material. Soluble Li, Ni, Co and Mn compounds are mixed based on a high-nickel ternary proportion and uniformly dispersed in a chitosan glue solution; next, the product is subjected to high-pressure spraying and drying by a spray dryer, and the product is put into a combined liquid of aniline monomer and ammonium persulfate at the moment of a laser burn-in process by a nozzle, and constant-temperature processing is performed under N<2> protection to obtain the low-alkali air-blocking high-nickel ternary electrode material. By virtue of the method provided by the invention, the defects of increasing of irreversible capacity and extremely caused battery expansion caused by lithium carbonate easily generated by alkali residue in the preparation and use process of the existing high-nickel ternary material are overcome; the high-nickel ternary electrode material is preparedin an alkali-free condition; and by wrapping polyaniline, the high-nickel ternary electrode material has high air blocking function, thereby preventing surface separating out of lithium carbonate, lowering potential safety hazards of the battery in use, and further lowering process difficulty in manufacturing of the high-nickel ternary lithium battery.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a preparation method of a low-alkali, gas-barrier, high-nickel ternary lithium battery electrode material. Background technique [0002] With the process of economic globalization and the increasing demand for energy, finding new energy storage devices has become a hot spot in the field of new energy. Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Compared with traditional storage batteries, lithium-ion ...

AI Technical Summary

Problems solved by technology

[0009] For the preparation of existing high-nickel ternary materials, the alkali residues in the process of use are easy to produce lithium carbonate, which leads to an increase in irreversible capacity and can easily cause the defect of battery flatulence. In order to reduce the residual alkali and reduce the process difficulty in the manufacture of high-nickel ternary lithium batteries,