A preparation method of ternary cathode material for coated lithium ion battery

Abstract

A method for preparing ternary cathode material of coated lithium ion battery includes such steps as sequentially adding solution with different ion solubility to carry out coprecipitation reaction, adding polyacrylamide during coprecipitation reaction, pre-sintering and removing polyacrylamide to obtain porous spherical ternary material precursor; Then the precursor of porous spherical ternary material was coated with Al2O3, and sodium dodecyl benzene sulfonate was added into the coated solution. Finally, the cathode active material of lithium ion battery was obtained by sintering. A method for preparing a ternary cathode material of a coated lithium ion battery according to that present embodiment greatly improve the capacity, rate performance and cycle stability of the ternary cathode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a positive electrode active material of a lithium ion battery, in particular to a preparation method of a coated lithium ion battery ternary positive electrode material. Background technique [0002] Lithium-ion battery is a clean, efficient, small and green energy storage device. It is becoming more and more popular in space development, aerospace equipment and people's daily life. Moreover, the demand for lithium-ion batteries in electric vehicles and electronic products is gradually increasing. Lithium-ion batteries will surely become the mainstream power supply in the future. LiCoO is currently the most widely used cathode material for lithium-ion batteries on the market. 2 , but LiCoO 2 However, due to the disadvantages of high cost, low capacity, and large pollution, lithium-ion batteries have obviously fallen behind the pace of the times. Therefore, it is particularly important to find a new lithium-ion battery cathod...

AI Technical Summary

Problems solved by technology

However, the solution deposition method is generally used to coat the surface of the ternary material at present. It is difficult to completely disperse the ternary cathode material during the reaction. Once agglomeration occurs, the inner core and inner core of the coated product The structure of the ternary cathode material is unstable, and at the same time, it is easy to appear that the coating layer is not tightly combined with the core during coating, which affects the transmission of lithium ions inside the ternary cathode material, resulting in poor rate performance.