▎ 摘　　要

NOVELTY - A carbon-graphene double modified lithium iron phosphate cathode material preparing method involves weighing iron source, phosphorus source and lithium source, and dispersing the weighed sources in graphene oxide. Citric acid is added to the dispersion and mixed. The obtained dispersion is spray dried, sintered and cooled. Certain amount of obtained graphene modified lithium iron phosphate kernel is weighed and water-soluble organic carbon is added. The obtained carbon-containing kernel is dissolved in deionized water, spray dried, sintered and cooled to obtain the finished product. USE - Method for preparing a carbon-graphene double modified lithium iron phosphate cathode material that is utilized for a high-power lithium-ion battery. ADVANTAGE - The method enables preparing the lithium iron phosphate cathode material with high tap density, excellent electric conductivity and electrochemical property. DETAILED DESCRIPTION - A carbon-graphene double modified lithium iron phosphate cathode material preparing method involves weighing iron source, phosphorus source and lithium source, and dispersing the weighed sources in 0.5-10 mass% graphene oxide. Citric acid as complexing agent is added to the dispersion, mixed and adjusted to pH value of 2-6. The obtained dispersion is spray dried at 100-250 degrees C under non-oxidizing atmosphere, and sintered at 550-900 degrees C for 1-20 hours and cooled to obtain graphene modified lithium iron phosphate kernel. Certain amount of the lithium iron phosphate kernel is weighed and water-soluble organic carbon is added to obtain carbon-containing lithium iron phosphate kernel. The obtained carbon-containing kernel is dissolved in deionized water, spray dried at 100-250 degrees C in a non-oxidizing atmosphere, sintered at 400-850 degrees C for 30-300 minutes and cooled in a furnace to obtain the finished product.