Technical field

The invention belongs to the field of nanomaterials preparation, in particular relates to a preparation method of a hollow iron-manganese composite oxide material for lithium-ion battery.

Background technique

Due to the decreasing of non-renewable resources such as coal, oil and natural gas and the resulting environmental deterioration, the development and utilization of new clean energy has become an urgent task that mankind is facing. Lithium-ion batteries have attracted great attention because of advantages such as high voltage, high energy density, good safety, light weight, small self-discharge, long cycle life, no memory effect, and no pollution. 

At present, most of the negative electrode materials of lithium-ion batteries are carbon materials such as graphite, but the research shows that carbon materials have disadvantages such as large capacity loss and high rate charge and discharge performance. Carbon anode is easy to form passivation film in organic electrolyte, causing irreversible loss of initial capacity, and the electrode potential of carbon material is similar to that of lithium metal. When the battery is overcharged, lithium metal is easy to precipitate on the surface of the carbon electrode, forming dendrites and causing short circuit. Therefore, the search for better and more reliable new lithium ion battery anode materials has become an important research direction.

Content of invention

The invention aims to provide a preparation method of hollow iron-manganese composite oxide material for lithium ion battery. Potassium ferricyanide was dissolved in water, surfactant was added, the solution was mixed with aqueous solution of manganese divalent salt, stirring at 30-80℃ for 1-3 h, the precipitation was centrifuged, washed with water and dried to obtain the precursor Mn3[Fe(CN)6]2. The precursor Mn3[Fe(CN)6]2 was calcined at 400-700℃ for 2-5 h to obtain the hollow nanostructures of Fe-Mn composite oxides with regular particle shapes.

Because the hollow structure of the material can provide a buffer space for lithium embedding and delithium, and reduce the volume change of the material during the charge and discharge cycle, the material shows excellent lithium storage performance and cycle stability, and it is expected to be applied to the negative electrode material of lithium-ion batteries.

The invention provides a new method for preparing Fe-mn composite oxide hollow nanostructure material, which shows the characteristics of simple preparation process, short reaction time, good controllability, low production cost and easy industrialization implementation.