Anode material having porous core-shell structure and method of preparing the same and battery

A method of preparing an anode material having a porous core-shell structure, comprising:

• dispersing, at least one selected from a group consisting of calcium carbonate and calcium oxalate, and at least one carbonaceous material selected from a group consisting of graphite, hard carbon and soft carbon, into a first solution to obtain a dispersion solution, wherein the first solution contains cobalt compound and tin compound;
• introducing a precipitant into the dispersion solution to carry out precipitation;
• obtaining a first solid phase by solid-liquid separation of the precipitated dispersion solution;
• dispersing the first solid phase into a second solution containing carbon source material;
• obtaining a second solid phase by removing solvent;
• and
• treating the second solid phase with a high temperature decomposition treatment in inert atmosphere,
• wherein the anode material comprises:
• a core formed of the at least one carbonaceous material;
• and
• a carbon shell coated on a surface of the core, wherein the carbon shell comprises amorphous carbon, a cobalt element, and a tin element, and the carbon shell is a porous structure that has a plurality of pores and a porosity percentage of a pore volume in a total volume of the carbon shell greater than 10%, and wherein a weight ratio of the cobalt element to the tin element to the amorphous carbon of the carbon shell is about 1:2-4:4-8, the cobalt element and the tin element are presented in the carbon shell in a form of tin cobalt alloy particles, and the tin cobalt alloy particles have a particle diameter of about 30 nanometers to about 70 nanometers.