Pomegranate-like CoO@nitrogen-doped carbon microspheres with outstanding rate behavior and stability for lithium storage
Rational design and preparation of CoO-based materials with excellent electrochemical performances for lithium ion batteries (LIBs) are highly desirable. In this work, we develop a CoO-based material with novel pomegranate-like microspherical structure, in which ultrafine CoO nanoparticles coupled with carbon framework are intimately confined within N-doped carbon outer shells (denoted as CoO@NC). Such robust pomegranate-like architecture can not only facilitate the electron/mass transport in CoO/carbon electrode to boost rate capability, but also minimize aggregation of CoO microstructures to prolong cycle life during the electrochemical process. Correspondingly, the CoO@NC nanocomposite manifests high capacity of around 1200 mAh g−1 at 0.1 C, excellent cycling stability up to 150 cycles, and superior rate capability of 533 mAh g−1 at 10 C as an anode material for LIBs.