Composite negative electrode material and method for preparing composite negative electrode material, negative electrode plate of lithium ion secondary battery, and lithium ion secondary battery

A negative electrode plate of a lithium ion secondary battery, comprising:

• a current collector;
• and
• a composite negative electrode that covers the current collector, wherein the composite negative electrode comprises:
• a doped carbon core containing a first doping element, wherein the first doping element comprises nitrogen, wherein a nitrogen atom of the first doping element and a carbon atom in the doped carbon core are bonded in at least one form of pyridinic nitrogen, graphite nitrogen or pyrrolic nitrogen;
• and
• a doped carbon coating layer that coats a surface of the doped carbon core, wherein the doped carbon coating layer comprises a second doping element that is N, P, B, S, F, Cl, or H, and wherein the first doping element of the carbon core is different from the second doping element.

A lithium ion secondary battery, comprising:

• a negative electrode plate of the lithium ion secondary battery that comprises:
• a current collector;
• and
• a composite negative electrode that covers the current collector, wherein the composite negative electrode comprises:
• a doped carbon core containing a first doping element, wherein the first doping element comprises nitrogen, wherein a nitrogen atom of the first doping element and a carbon atom in the doped carbon core are bonded in at least one form of pyridinic nitrogen, graphite nitrogen or pyrrolic nitrogen;
• and
• a doped carbon coating layer that coats a surface of the doped carbon core, wherein the doped carbon coating layer comprises a second doping element that is N, P, B, S, O, F, Cl, or H, and wherein the first doping element is different from the second doping element;
• a positive electrode;
• a separator separating the negative electrode plate and positive electrode from each other;
• a non-aqueous electrolyte;
• and
• a shell that houses the negative electrode plate, the positive electrode, the separator, and the non-aqueous electrolyte to form the lithium ion secondary battery.