Prussian blue analogues‐derived nitrogen‐doped carbon‐coated FeO/CoO hollow nanocages as a high‐performance anode material for Li storage
Chen Liu, Shuang Yuan, Yang Yang, Xiaoxi Zhao, Xiao Duan, Bin Cao, Qiang Wang
Abstract
Abstract The design of electrode materials with specific structures is considered a promising approach for improving the performance of lithium‐ion batteries (LIBs). In this paper, FeO/CoO hollow nanocages coated with a N‐doped carbon layer (FCO@NC) was prepared using Fe‐Co‐based Prussian blue analogs (PBA) as a precursor. During the synthesis, dopamine was the carbon and nitrogen source. The reducing atmosphere was assured via NH 3 /Ar, which regulated the vacancies in the structure of FCO@NC as well as increased its conductivity. When used as anode materials for LIBs, the FCO@NC nanocages deliver a high reversible capacity of 774.89 mAh·g −1 at 0.3 A·g −1 after 200 cycles with a capacity retention rate of 80.4% and 426.76 mAh·g −1 after 500 cycles at a high current density of 1 A·g −1 . It is demonstrated that the hollow nanocage structure can effectively enhance the cycle stability, and the heat treatment in NH 3 /Ar atmosphere contributes to the oxygen vacancy content of the electrode materials, further facilitating its conductivity and electrochemical performance.