| abstract |
The present invention relates to a lithium phosphorus composite oxide carbon composite material in which a surface of a lithium phosphorus composite oxide used in a positive electrode active material of an electrochemical device is coated with carbon and is characterized in that fluorine ions dissolved in an effluent obtained by dispersing a lithium phosphorus composite oxide carbon composite material in ultrapure water (1): ???????? Li 1 - x Fe 1 - z M z PO 4 - a F a (-0.1 ? X ) in the composition of the lithium phosphorus composite oxide is in the range of 500 ppm or more and 15000 ppm or less in the mass ratio with respect to the lithium phosphorus- <1, 0? Z? 1, 0? A? 4) ... (1), wherein M represents at least one metal element selected from the group consisting of Mn, Ni, Co, V, Cr, Al, Nb, Ti, Cu and Zn. Complex oxide carbon composite. Thereby, even when a raw material containing trivalent is used, a lithium phosphorus complex oxide carbon composite material in which a high charge / discharge capacity is obtained when used as a positive electrode active material of an electrochemical device is provided. |