High‐Performance, Layered, 3D‐LiCoO2 Cathodes with a Nanoscale Co3O4 Coating via Chemical Etching

Chemical etching concurrently modifies pristine to layer-by-layer 3D-LiCoO2 with a Co3O4 coating. Not only can the layered morphology affect the high electrochemical performance, but also the coating effect reduces the structure instability of the LiCoO2 during cycling. This process can be applied to design other compounds to enhance their performance in Li-ion batteries.