Ferrosilicon composite negative electrode material and preparation method thereof

The invention provides a silicon iron composite negative electrode material and a preparation method thereof. The preparation method of the ferrosilicon composite negative electrode material comprises the following steps: adding ferrosilicon alloy into a solvent, and grinding and mixing to obtain ferrosilicon alloy slurry; adding the conductive agent slurry and a carbon source into the ferrosilicon alloy slurry, and dispersing and stirring to obtain nano mixed slurry; carrying out spray drying operation on the nano mixed slurry to obtain a spherical particle precursor; adding the carbon-coated material into the spherical particle precursor, and stirring and mixing to obtain a carbon-coated ferrosilicon alloy; and carrying out carbonization operation on the carbon-coated ferrosilicon alloy to obtain the ferrosilicon composite negative electrode material. According to the preparation method of the silicon iron composite negative electrode material, the specific capacity and the first charge-discharge efficiency