General Synthesis of Multiple‐Cores@Multiple‐Shells Hollow Composites and Their Application to Lithium‐Ion Batteries

Rational nanostructure design has proved fruitful in addressing the bottlenecks of diverse fields. Especially hollow multi‐shelled structures (HoMS) have stood out due to their temporal–spatial ordering mass transfer and buffering effect. Localizing multiple cores in a HoMS is highly desired, which could endow it with more fascinating properties. However, such a structure has been barely reported due to the highly challenging fabrication. Here, we develop a controllable synthesis strategy to realize such a structure, which is applicable for diverse cores and shells. Additionally, cores and shells could be tuned to be homogeneous or heterogeneous, with the core and shell number well controlled. In situ TEM analysis verifies that the inner shell confines the expansion orientation of cores, while the outer shell maintains a stable interface. In addition to energy storage, such structure is also promising for multi‐drug co‐delivery and sequential responsive release as well as tandem catalysis applications. A controllable synthesis strategy is developed to fabricate multiple‐cores@multiple‐shells composite, which is applicable for diverse cores and shells. The cores and shells could be tuned to be homogeneous or heterogeneous with the number of cores and shells well controlled. Such a structure shows great promise for superior energy storage, multi‐drug co‐delivery and sequential release, and tandem catalysis applications.