Carbon layer on the surface of PNb₉O₂₅ nanowires offers lots of areas for charge transfer

Carbon coating always has a positive effect on improving the electrochemical performance of electrode materials for lithium ions batteries and its mechanism has once drawn great attention, yet few studies offer a model to elaborate on it. In this study, we select PNb₉O₂₅ nanowires as anode material and coat carbon on them to investigate how carbon layer does affect its electrochemical performance. Meanwhile, a theoretical model has proposed for the investigation of mass transfer and electron transfer at the surface of PNb₉O₂₅. The result suggests that due to the presence of carbon layer, mass transfer and electron transfer at the surface of PNb₉O₂₅ shows a decent boost, leading to the improvement of electrochemical performance at the high current density.