| abstract |
An embodiment of the present invention provides a composite negative electrode material, the composite negative electrode material includes a carbon core and a carbon coating layer, the carbon coating layer is a carbon layer coated on the surface of the carbon core, and is characterized in that , the carbon inner core and the carbon coating layer both contain doping elements, and the doping elements are at least one of N, P, B, S, O, F, Cl, and H elements. Embodiments of the present invention also provide a method for preparing a composite negative electrode material, a lithium ion secondary battery negative electrode pole piece comprising the composite negative electrode material, and a lithium ion secondary battery comprising a lithium ion secondary battery negative electrode active material. |