Design and synthesis of yolk-shell FeO/N-doped carbon nanospindles with rich oxygen vacancies for robust lithium storage.

Ferric oxide (FeO) is an attractive anode material for lithium-ion batteries (LIBs) with a high theoretical capacity of 1005 mA h g. However, its practical application is greatly restrained by the rapid capacity fading caused by the large volume expansion upon lithiation. To address this issue, we have designed and synthesized a unique yolk-shell FeO/N-doped carbon hybrid structure (YS-FeO@NC) with rich oxygen vacancies for robust lithium storage.