Encapsulation of core-satellites silicon in carbon for rational balance the void space and capacity

The void space is widely proposed in anode materials for relieving the volume expansion during the lithium insertion and extraction process. Generally, the void is randomly generated or exceeded the expansion to ensure the structural stability, which thus sacrifices the capacity and energy density. Herein, we raise a core-satellites architecture with elaborately structural design for rational balance the void space and capacity. Such well fabricated Si@pSi@C core-satellites nanoparticles with precise void space present decent capacity of 1002 mA h g-1 over 100 cycles at current of 100 mA g-1. This delicate core-satellites architecture could promote the structural design in high-energy density lithium-ion batteries.