Solution-processed nitrogen-rich graphene-like holey conjugated polymer for efficient lithium ion storage

• Published in: Nano energy 2017-11, Vol.41, p.117-127
• Main Authors: Lin, Zong-Qiong, Xie, Jian, Zhang, Bo-Wei, Li, Jie-Wei, Weng, Jiena, Song, Rong-Bin, Huang, Xiao, Zhang, Hao, Li, Hai, Liu, Ye, Xu, Zhichuan J., Huang, Wei, Zhang, Qichun
• Format: Article
• Language: English
• Subjects: 2D holey conjugated polymer (HCP); Electrochemistry; Graphene-like; Li-ion batteries; Microporous materials
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2017.08.038

Preparing well-defined single-layer two-dimensional (2D) holey conjugated polymers (HCP) is very challenging. Here, we report a bottom-up method to produce free-standing single-layer nitrogen-rich graphene-like holey conjugated polymers (NG-HCP) nanosheets through solution-process. The as-prepared 2D NG-HCP sheet possesses a thickness of 1.0 ± 0.2nm and consists of graphene-like subunits as well as homogeneous hexagonal micropores (ca. 11.65Å). The synergistic effect of high porosity, heteroatomic doping and good dispersity of NG-HCP nanosheets make them suitable as excellent anode materials for Li-ion batteries (LIBs), leading to an extremely high reversible capacity of 1320mAhg−1 (at 20mAg−1), a good rate performance, and an excellent cycle life with an approximate 100% Coulombic efficiency for more than 600 cycles. Our findings would open new opportunities to develop state-of-the-art free-standing 2D-HCP materials for low-cost and high performance energy storage as well as optoelectronic devices. [Display omitted] •A 2D nitrogen-rich holey conjugated polymer (NG-HCP) is design as the anode of LIBs.•It possesses highly nitrogen doping, graphene subunits and honeycomb microporous.•A high reversible capacity, excellent cycle life and good rate performance achieves.•The synergistic porosity, nitrogen doping and dispersity lead to a high performance.