| abstract |
Provided is a positive electrode active material for a lithium secondary battery having a high volume capacity density, high safety, excellent uniform coating properties, and excellent charge / discharge cycle durability and low temperature characteristics even at high charge voltages. Formula Li p N x M y O z F a (Wherein N is at least one element selected from the group consisting of Co, Mn and Ni, and M is at least one selected from the group consisting of transition metal elements other than N elements, Sn, Zn, Al and alkaline earth metal elements) Is an element of a species: 0.9 ≦ p ≦ 1.1, 0.97 ≦ x <1.00, 0 <y ≦ 0.03, 1.9 ≦ z ≦ 2.1, x + y = 1, 0 ≦ a ≦ 0.02) As a method, the carboxylic acid which has at least a carboxylic acid group in a M element source, a molecule, and the sum total of the number of carboxylic acid groups or the number of carboxylic acid groups and a hydroxyl group is 2 or more, and an average particle diameter (D50) is 2-20. Using an N element source powder having a μm and a lithium source powder and a fluorine source if necessary, an aqueous solution of M element salt of carboxylic acid is prepared from at least the M element source and the carboxylic acid, and the aqueous M element salt solution is prepared. Dry mixed powder impregnated and prepared in the said N element source powder In the oxygen-containing atmosphere and baked at 700 ~ 1050 ℃. |