One‐Nanometer‐Precision Control of Al 2 O 3 Nanoshells through a Solution‐Based Synthesis Route

Forming uniform metal oxide nanocoatings is a well‐known challenge in the construction of core–shell type nanomaterials. Herein, by using buffer solution as a specific reaction medium, we demonstrate the possibility to grow thin nanoshells of metal oxides, typically Al 2 O 3 , on different kinds of core materials, forming a uniform surface‐coating layer with thicknesses achieving one nanometer precision. The application of this methodology for the surface modification of LiCoO 2 shows that a thin nanoshell of Al 2 O 3 can be readily tuned on the surface for an optimized battery performance.