Preparation and characterization of MnFe2O4 in the solvothermal process: Their magnetism and electrochemical properties

• Effect of CTAB on the morphology and crystallization of MnFe2O4.
• The lowest coercivity of MnFe2O4 polyhedron is 11.9 Oe.
• MnFe2O4 as anode for LIB shows good reversible capacity and cycle performances.

The uniform different morphologies MnFe2O4, including cube, truncated cube, polyhedron and octahedron, were successfully synthesized via a solvothermal route using cetyltrimethylammonium bromide. The results of control experiments revealed that the concentration of cetyltrimethylammonium bromide was an important factor, which affected the morphology and crystallization of MnFe2O4 submicro-crystals. All the prepared samples exhibited soft-magnetic behavior at room temperature. Especially, the coercivity of MnFe2O4 polyhedron with 200 nm diameter was 11.9 Oe, which was among the lowest values reported so far. Moreover, MnFe2O4 submicro-crystals with special morphologies demonstrated higher reversible capacity (about 1000 mAh g−1) and different cycle performances. After 50 cycles, polyhedron structure remained 428 mAh/g. The MnFe2O4 would have a potential application as anode material for lithium ion batteries.

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