Negative active material, method of preparing negative active material and lithium ion battery comprising the same

A lithium ion battery, comprising:

• a battery shell;
• and
• an electrical core and an electrolyte in the battery shell, the electrical core comprising a positive electrode, a negative electrode and a separator disposed therebetween;
• the negative electrode comprising a substrate and a negative active material;
• wherein the negative active material comprises:
• a core comprising a carbon material;
• and
• a plurality of composite material particles attached to a surface of the core, each of the composite material particles comprising a first material and a second material coated on the first material;
• wherein the first material is at least one selected from the elements that can form an alloy with lithium, and the second material is at least one selected from the group consisting of transition metal oxides, transition metal nitrides and transition metal sulfides.