Oxygen-deficient Niobium Oxide in Carbon Matrix as Anode for Lithium-Ion Battery
Herein, we report a one-step facile hydrothermal synthesis of Nb2O5/carbon matrix using glucose as the carbon source. After post-heat treatment under H2 gas, the glucose is carbonized to form carbon matrix and Nb2O5 nanocrystals are homogeneously immersed in carbon matrix. The stoichiometric Nb2O5 insulator becomes to oxygen-deficient niobium oxide semiconductor, and this carbon matrix can efficiently prevent niobium oxide nanocrystals from pulverization during the charge-discharge processes, resulting in improved recyclability. In addition, the carbon matrix and oxygen-deficient niobium oxide can effectively enhance the electronic conductivity and lithium ion conductivity of our electrode material, which results in enhanced rate performance and cycle durability. We believe that such a kind of niobium oxide/carbon matrix structure provides a new design toward high cycle durability niobium oxide based anode materials.