| abstract |
The invention discloses a preparation method of a high compaction density lithium iron manganese phosphate/carbon composite positive electrode material. The general chemical formula is: LiMn x Fe y PO 4 /C, 0.5≤x≤0.9, x+y=1; The preparation method is as follows: dilute phosphoric acid for standby use, add manganese source, iron source, dispersant and deionized water in a sealable container, and introduce protective gas; add the diluted phosphoric acid into the sealed container, and age it so that the pH value is at 2.0 ～5.0, uniform nucleation; the formed precipitate is washed, vacuum dried, and sintered at high temperature for the first time to form spherical particles A; take lithium hydroxide monohydrate to prepare a solution, add spherical particles A into it, after spray drying, high temperature second Sintering for a second time to obtain spherical particles B; preparing a glucose solution, adding spherical particles B into it, after spray drying, and sintering at a high temperature for the third time to obtain a nano spherical lithium iron manganese phosphate/carbon composite material. The invention greatly improves the electrochemical performance of the material and the compaction density of the material. |