SCHEDULED MAINTENANCE
A highly nitrogen-doped porous graphene – an anode material for lithium ion batteries
Abstract
A novel nitrogen-doped porous graphene material (NPGM) was prepared by freeze-drying a graphene/melamine–formaldehyde hydrogel and subsequent thermal treatment. The use of melamine–formaldehyde resin as a cross-linking agent and nitrogen source enhances the nitrogen content. NPGM possesses a hierarchical porous structure, a large Brunauer–Emmett–Teller surface area (up to 1170 m2 g−1), and a considerable nitrogen content (5.8 at%). NPGM displays a discharge capacity of 672 mA h g−1 at a current density of 100 mA g−1 when used as an anode material for lithium ion batteries, much higher than that observed for a nitrogen-free graphene porous material (450 mA h g−1). The NPGM electrode also possesses superior cycle stability. No capacity loss was observed even after 200 charge/discharge cycles at a current density of 400 mA g−1. The enhanced electrochemical performance is attributed to nitrogen doping, high specific surface area, and the three-dimensional porous network structure.
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