Positive electrode active material

Abstract

The invention provdies a positive electrode active material including lithium- ithium transition metal complex oxide which contains lithium, a main transition metal M1 and metal element M2 different from the main transition metal M1, wherein the metal element M2 has a concentration gradient from the particle center toward a particle surface. Within a range where a ratio d(%) from the particle surface to a prescribed depth(=[(mass of main transition metal M1)+(mass of metal element M2)] / (particle all mass)) satisfies a relation of 0.020%<=d<=0.050%, a mole fraction r (=(material amount of metal element M2) / [(material amount of main transition metal M1)+(material amount of metal element M2)]) is within a range of 0.20<=r<=0.80. The main transition metal M1 is selected from at least one of nickel (Ni), cobalt (Co) and manganese (Mn), and the main transition metal M1 is selected from at least one of the manganese (Mn), magnesium (Mg), aluminum (Al), nickel (Ni), boron (B), titanium (Ti), cobalt (Co) and iron (Fe).

Description

[0001] This application is a divisional application with an application date of September 9, 2010, an application number of 201410014566.X, and an invention title of "Positive Electrode Active Material", and the application number of 201410014566.X is an application date of September 2010 On the 9th, the divisional application of the invention patent application with the application number 201010279232.7 and the invention title "positive electrode active material and its preparation method, positive electrode and non-aqueous electrolyte battery". technical field [0002] The invention relates to a positive pole active material, a positive pole, a nonaqueous electrolyte battery and a method for preparing the positive pole active material. More particularly, the present invention relates to a positive electrode active material, a positive electrode, a nonaqueous electrolyte battery and a preparation thereof by which a nonaqueous electrolyte battery having high performance and exh...

AI Technical Summary

Problems solved by technology

When the inventors of the present invention prepared a positive electrode active material by mixing metal fluorides and heat-treating the mixture according to the disclosure, a practical effect on high-temperature storage stability was observed, but the effect was limited to the effect on the surface of the particles and based on actual Performance is insufficient

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