A highly nitrogen-doped porous graphene - an anode material for lithium ion batteries

Authors

Zhu Yin Sui, University of Wollongong
Caiyun Wang, University of WollongongFollow
Quan-Sheng Yang, National Center for Nanoscience & Technology
Kewei Shu, University of WollongongFollow
Yu-Wen Liu, Yanshan University
Bao Hang Han, National Center for Nanoscience and Technology Beijing
Gordon G. Wallace, University of WollongongFollow

RIS ID

102756

Publication Details

Sui, Z., Wang, C., Yang, Q., Shu, K., Liu, Y., Han, B. & Wallace, G. G. (2015). A highly nitrogen-doped porous graphene - an anode material for lithium ion batteries. Journal of Materials Chemistry A, 3 (35), 18229-18237.

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.