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On the basis of stober method,the Fe3O4 was passivated by silica,and the lithium manganese oxide was grown at the interface of silica.Li1.6Mn1.6O4 @ SiO2 @ Fe3O4 nanometer lithium ion sieve precursors were produced after aged,filtered,dried and calcined.SEM and EDX tests showed that the lithium manganese spinel is relatively uniformly coated on the passivated magnetic core surface.