| abstract |
The present application relates to the field of negative electrode materials, and provides a composite negative electrode material, a preparation method thereof, and a lithium ion battery, wherein the composite negative electrode material includes an inner core and a coating layer located on the surface of the inner core; wherein, the inner core includes primary particles and a a nanoparticle layer on the surface of a primary particle; the primary particle includes a skeleton, the skeleton includes a main skeleton located inside the primary particle and a plurality of branches extending from the main skeleton to the surface of the primary particle; the The nanoparticle layer is formed with micropores and/or mesopores. The composite negative electrode material, the preparation method thereof, and the lithium ion battery provided by the present application can effectively suppress the volume expansion of the negative electrode material and improve the cycle performance of the battery. |