Low-temperature continuous production process for lithium iron phosphate and dedicated device therefor

• Main Authors: SHEN CHAO, PENG CHUNLI, CHEN HEZHANG, ZHANG JIAFENG, ZHANG BAO
• Format: Patent
• Language: Chinese; English
• Published: 07.09.2011
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention discloses a low-temperature continuous production process for lithium iron phosphate and a dedicated device therefor. The process comprises the following steps: preparing ferrous oxalate, lithium dihydrogen phosphate, an organic composite carbon source and a composite metal compound which are used as raw materials; mechanically stirring the raw materials in a way of circulation reflux in methanol which is used as a medium; performing fluidized drying on the resulting slurry to obtain a lithium iron phosphate precursor containing the composite carbon source and the composite metal compound; performing micronization and mechanical compaction and then calcining at a low temperature in a protective atmosphere with extremely-low oxygen content; and performing air flow classification and vibratory screening to obtain fine-particle lithium iron phosphate which has uniform grain-size distribution and excellent electrochemical properties and is used as an anode material for lithium ion batteries. The pro