Positive electrode active material, method for producing same, and lithium secondary battery

Abstract

PROBLEM TO BE SOLVED: To effectively suppress the decomposition reaction of an electrolytic solution by an organic phosphate coating layer formed on the surface, thereby significantly improving an electrochemical performance of an electrochemical device including it, especially that of a lithium secondary battery.SOLUTION: Provided are a positive electrode active material, a manufacturing method thereof, and a lithium secondary battery including the positive electrode active material. The positive electrode active material comprises: lithium transition metal oxide-based particles; and an organic phosphate coating layer partially or totally formed on the surface of each particle.SELECTED DRAWING: Figure 1

Description

technical field [0001] The present invention relates to a novel positive electrode active material, its production method, and an electrochemical element (preferably a lithium secondary battery) equipped with such a positive electrode active material. , so that the decomposition reaction between the positive electrode material and the electrolyte can be suppressed and the electrochemical performance of the lithium secondary battery can be significantly improved. Background technique [0002] In recent years, as the miniaturization of electronic equipment has required high-capacity secondary batteries, lithium secondary batteries, which have a higher energy density than nickel-cadmium batteries and nickel-hydrogen batteries, have attracted attention in particular. [0003] Lithium-containing cobalt oxide (LiCoO 2 ), in addition, the use of LiMnO with a layered crystal structure is also considered 2 , LiMn with spinel crystal structure 2 o 4 Lithium-containing manganese ox...

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Problems solved by technology

Among the above positive electrode active materials, LiCoO 2 It is widely used due to its excellent life characteristics and charge-discharge efficiency, but it has the following disadvantages due to its small capacity and high price due to limited resources of cobalt used as a raw material. Limitations in terms of price competitiveness

[0004] In order to make up for such shortcomings, the demand for nickel-rich system (Ni rich system) has begun to increase as the positive electrode active material of the secondary battery. The reaction, showing the deterioration of battery performance

[0005] Although the technology for effectively suppressing the reaction of the above-mentioned cathode active material with the electrolyte solution is currently being developed, satisfactory results have not yet been obtained

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