The invention discloses a
precipitation method for preparing nanometer level
iron phosphate lithium coated with carbon. The method comprises the following steps: firstly, weighing iron salt, deionized water and a compound of metallic elements; after the stirring and the mixing are performed, adding a phosphorous compound and
citric acid diluted with water to the mixture; after the stirring is performed again, adding a
precipitation agent to the mixture and controlling to the neutrality; stirring to react in a container, and after the static placement, respectively adding the deionized water, a
carbon source and
lithium salt to mix uniformly after the precipitate is filtered and washed; stirring again to react, and
drying the water at 30 to 160 DEG C and
warming up at the heating rate under the protection of non-oxidized gas after a product is crashed; baking at a constant temperature of 450 to 850 DEG C,
cooling down to a
room temperature at a
cooling rate or with a stove, and finally obtaining the nanometer level
ferric phosphate lithium coated with the carbon after crashing is performed. The
precipitation method has the
advantage that the
raw material cost and the
processing cost are low because bivalent iron is taken as the
raw material. The
iron phosphate lithium prepared by using the process has the characteristics of good physical
processing performance and good
electrochemistry performance, and is suitable for industrialized production.