Patent ID: 9444098
Filing Date: 2016-09-13
CPC Classification: H01M,Y02E,Y02P

Claim Text:
1. A positive active material comprising: a lithium-containing oxide; and a lithium-intercalatable phosphate compound disposed on the lithium-containing oxide, wherein the phosphate compound includes both primary particles and secondary particles including the primary particles, wherein the primary particles of the phosphate compound have an average particle diameter of from about 0.01 nanometers to about 1,000 nanometers, wherein the secondary particles of the phosphate compound have an average particle diameter of from about 0.02 nanometers to about 15 micrometers, wherein at least some of the phosphate compound is in a form of a coating on at least a portion of a surface of a particle of the lithium-containing oxide, and the phosphate compound is further disposed inside a particle of the lithium-containing oxide, wherein the phosphate compound is a compound represented by Formula 1: wherein, in Formula 1, M is at least one selected from a transition metal having an ionic diameter of from about 60 angstroms to about 90 angstroms and an oxidation number of +5, and wherein the lithium-containing oxide comprises at least one compound selected from compounds represented by Formulas 2 to 4: wherein, in Formula 2, wherein in Formula 3, wherein, in Formula 4,