Preparation of ZnNb2O6/N-doped carbon composites for lithium ion storage

Recently, conductive M-Nb-O composites have gained much attention as a novel lithium ion storage anode material. However, the conductivity and rate performance of M-Nb-O composites still need to be further enhanced. Herein, we have designed a facile strategy to prepare ZnNb 2 O 6 /N-doped carbon (ZnNb 2 O 6 /NC) which is derived from Nb 2 O 5 @zeolitic imidazole frameworks precursor. The ZnNb 2 O 6 /NC exhibits advanced energy storage properties including high initial capacity (673 mA h g −1 at 100 mA g −1 ), superior reversible specific capacity (412.6 mA h g −1 until 100 cycles at 100 mA g −1 ), long-term cyclic stability and excellent rate capability (470.5 mA h g −1 after 800 cycles at a relatively high current density of 2 A g −1 ).