Approach for manufacturing efficient mesoporous nano-composite positive electrode LiMn1-xFexPO4 materials

摘要

A process of preparing mesoporous nano-composite LiMn1-xFexPO4 (0≦x≦1, e.g., x=0, 0.2, 0.5 and 0.8) particles. The process contains the steps of providing a mixture of a soft-template compound, a lithium ion-containing compound, an iron ion-containing compound, a manganese ion-containing compound, and a phosphate ion-containing compound in a solvent, removing the solvent to obtain a LiMn1-xFexPO4 precursor, and calcining the precursor followed by milling and annealing. Also disclosed is a mesoporous nano-composite LiMn1-xFexPO4 particle prepared by this process.

主权项

1. A process of preparing nano-composite LiMn1-xFexPO4 particles, the process comprising:
providing a solvent containing a soft-template compound, a lithium ion-containing compound, an iron ion-containing compound, a manganese ion-containing compound, and a phosphate ion-containing compound; removing the solvent to obtain a LiMn1-xFexPO4 precursor; calcining the LiMn1-xFexPO4 precursor to obtain crystalline LiMn1-xFexPO4 grains; milling the crystalline LiMn1-xFexPO4 grains in the presence of conductive carbon to obtain nanostructured LiMn1-xFexPO4/C particles; and annealing the nanostructured LiMn1-xFexPO4/C particles to obtain nano-composite LiMn1-xFexPO4/C particles, wherein 0≦x≦1; the amounts of the lithium ion-containing compound, the ferrous ion-containing compound, the manganese ion-containing compound, and the phosphate ion-containing compound are in stoichiometric proportion; and the weight ratio of the soft-template compound to the lithium ion-containing compound is 1:1 to 10:1.