Aluminum cladding method of high-safety lithium ion battery anode material

Abstract

The invention relates to a manufacturing method of a lithium ion battery anode material, in particular to an aluminum cladding method of a high-safety lithium ion battery anode material. The method comprises the following steps of: a, manufacturing a non-cladded anode material by adopting a conventional method; b, preparing a cladding solution, wherein the cladding solution is aluminum salt sol formed by mutually dissolving an aluminum source and a cosolvent, and the weight concentration of the aluminum salt in the sol is 15-30 percent; c, performing a cladding process: adding the non-cladded anode material to cladding-phase methanol or ethanol or acetone, stirring and mixing, and then adding an aluminum salt sol cladding solution, wherein the molar ratio Al / M of the element Al to the central element M of the anode material is 0.002-0.05; and d, heating and drying for 1-6h at 70-100 DEG C under the vacuumizing condition to form a finished product. According to the aluminum cladding method disclosed by the invention, the high-temperature storage safety and the cycle stability of the lithium ion anode material under high charging cutoff voltage can be ensured.

Description

Technical field [0001] The invention relates to a method for manufacturing a positive electrode material of a lithium ion battery, and a specific amount of aluminum coating method for a positive electrode material of a lithium ion battery with high safety. Background technique [0002] As a new type of secondary battery, Lithium-ion battery has the characteristics of high specific capacity, high voltage and good safety. It is widely used as the driving power of portable electric appliances such as mobile phones, notebook computers, camcorders, DVDs, MP3s, etc. However, with the continuous upgrading of electronic products, the requirements for their power sources have also been continuously improved, so there are higher requirements for the energy density of battery materials. There are two main methods to improve the energy density of materials: [0003] 1. In terms of improving material conductivity and compaction density [0004] Under the premise of exerting the same capacity, t...

AI Technical Summary

Problems solved by technology

After increasing the charging voltage (>4.2V), on the one hand, more than 50% of the lithium ions in lithium cobalt oxide will move out, which will cause the structure of lithium cobalt oxide to be unstable and prone to structural collapse; on the other hand, after increasing the voltage The surface activity of the material is enhanced, and it is easy to react with the electrolyte, which will bring potential safety hazards to the battery