Loading…
Melamine-based polymer networks enabled N, O, S Co-doped defect-rich hierarchically porous carbon nanobelts for stable and long-cycle Li-ion and Li-Se batteries
N, O, S co-doped hierarchically porous carbon nanobelts with fast channels and special defects exhibit high capacity and excellent cycling stability for Li-ion and Li-Se batteries. [Display omitted] •Defect-rich HPCNBs are derived from the whole organic Melamnie-based polymer network.•N, O, S co-dop...
Saved in:
Published in: | Journal of colloid and interface science 2021-01, Vol.582, p.60-69 |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | N, O, S co-doped hierarchically porous carbon nanobelts with fast channels and special defects exhibit high capacity and excellent cycling stability for Li-ion and Li-Se batteries.
[Display omitted]
•Defect-rich HPCNBs are derived from the whole organic Melamnie-based polymer network.•N, O, S co-doping HPCNBs enhances the electrical conductivity and chemical affinity.•The Se@HPCNB nanocomposite has fast channels and dual confinement for active species.•The Se@HPCNB nanocomposite demonstrates stable and long-term cycle for Li-ion and Li-Se batteries.
Li-Se battery is a promising energy storage candidate owing to its high theoretical volumetric capacity and safe operating condition. In this work, for the first time, we report using the whole organic Melamine-based porous polymer networks (MPNs) as a precursor to synthesize a N, O, S co-doped hierarchically porous carbon nanobelts (HPCNBs) for both Li-ion and Li-Se battery. The N, O, S co-doping resulting in the defect-rich HPCNBs provides fast transport channels for electrolyte, electrons and ions, but also effectively relieve volume change. When used for Li-ion battery, it exhibits an advanced lithium storage performance with a capacity of 345 mAh g−1 at 500 mA g−1 after 150 cycles and a superior rate capacity of 281 mAh g−1 even at 2000 mA g−1. Further density function theory calculations reveal that the carbon atoms adjacent to the doping sites are electron-rich and more effective to anchor active species in Li-Se battery. With the hierarchically porous channels and the strong dual physical–chemical confinement for Li2Se, the Se@ HPCNBs composite delivers an ultra-stable cycle performance even at 2 C after 1000 cycles. Our work here suggests that introduce of heteroatoms and defects in graphite-like anodes is an effective way to improve the electrochemical performance. |
---|---|
ISSN: | 0021-9797 1095-7103 |
DOI: | 10.1016/j.jcis.2020.06.071 |