Ferrous Phosphate Hydrate Crystal, Process for Preparing the Same, and Process for Preparing Lithium-Iron-Phosphor Based Combination

摘要

PPROBLEM TO BE SOLVED: To prepare a fine ferrous phosphate hydrate crystal excellent in processability and suitable as a raw material for producing a functional inorganic material, particularly that for LiFePOSB4/SBor LiFeMePOSB4/SB(Me is at least one metal element selected from Mn, Co, Ni and Al) to be used for the positive material of a lithium secondary battery, and to provide a method for industrially advantageously producing the above crystal in a high yield and a production method for a lithium/iron/phosphorus-based complex oxide using the crystal. PSOLUTION: The ferrous phosphate hydrate crystal is represented by the formula: FeSB3/SB(POSB4/SB)SB2/SB/8HSB2/SBO and has an average particle size of 5 m or less. It is preferable that the crystal has a half value width of a diffraction peak in a lattice place (020 plane) obtained by an X-ray diffraction analysis of 0.20. PCOPYRIGHT: (C)2004,JPO