Patent ID: 9216907
Filing Date: 2015-12-22
Classification: C01B,H01M,Y02E

Abstract:
1. A method of manufacturing a positive electrode active material for lithium ion batteries, comprising: preparing a mixture containing (A) Li3PO4, or a Li source and a phosphoric acid source; (B) at least one selected from the group of an Fe source, a Mn source, a Co source and a Ni source; water; and an aqueous organic solvent having a boiling point of 150° C. or more, wherein the amounts of (A), (B), and water in the mixture are adjusted to amounts necessary to manufacture therefrom LiMPO4 at a concentration of more than or equal to 0.5 mol/L and less than or equal to 1.5 mol/L, wherein M represents at least one selected from the group of Fe, Mn, Co, and Ni; substituting a part of the water with additional aqueous organic solvent having a boiling point of 1500° C. or more so that the total content of the aqueous organic solvent is 3 to 30% by mass of the total mass of the mixture, before the reaction starts at a high temperature and a high pressure; and generating fine particles of LiMPO4 having an average primary particle diameter of 30 to 80 nm by reacting the (A), the (B), water, and the aqueous organic solvent at the high temperature and the high pressure, wherein M represents at least one selected from the group of Fe, Mn, Co, and Ni.