Ternary cathode material of lithium ion battery and preparation method thereof

Abstract

The invention discloses a ternary cathode material of a high-performance lithium ion battery and a preparation method thereof. The ternary cathode material is characterized by having an alpha-NaFeO2 laminar structure and comprising chemical components of Li[1+z]Ni[x]Co[y]Mn[1-x-y]O[2], wherein z is not smaller than 0 and not more than 0.2, x is not smaller than 0.5 and not more than 0.8, and y is not smaller than 0.1 and not more than 0.2. The invention has the advantages and effects that: oxides of nickel, cobalt and manganese are used as raw materials, so that the influences of other anions are reduced; the raw materials are cracked into smaller particle sizes by using a pneumatic cracker, so that the reaction activity of the materials is enhanced; and solid-phase ball milling fusion is directly adopted, so that the reaction activity and the uniformity of the materials are increased, and no wastewater and waste gas are generated in the whole process, and environment friendliness is achieved. According to the invention, a special postprocessing manner is adopted to remove residual lithium on the surfaces of the materials, so that the cyclic property, the high-temperature property and the safety property of the materials are greatly increased. The preparation method disclosed by the invention has the advantages of simple process, easily controlled production process, easiness for realizing large-scale production, short production cycle and low cost. The ternary cathode material prepared in the invention has the characteristics of high specific capacity, large tap density, good cycle property, favorable high-temperature performance and good safety.

Description

technical field [0001] The invention relates to a high-performance lithium-ion battery ternary cathode material and a preparation method of the material. Background technique [0002] Lithium Ion Battery (LIB for short) is the third generation of small batteries after nickel-cadmium batteries and nickel-metal hydride batteries. As a new type of chemical power source, it has the outstanding advantages of high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low temperature performance, no memory, no pollution, etc. The batteries required by electrical appliances meet the dual requirements of small size, light weight and environmental protection. They are widely used in small electronic devices such as mobile communications, notebook computers, and video cameras. They are also ideal power sources for future electric vehicles. [0003] At present, as one of the important components of lithium-ion batteries, L...

AI Technical Summary

Problems solved by technology

Although the co-precipitation method improves the uniform distribution of ions to a certain extent, there are also some defects: the co-precipitation preparation method is costly, the process is complicated, the process control is difficult, and a large amount of waste water and waste gas are generated during the production process, which is very polluting to the environment. The tap density of the prepared material is too small