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

Wen Da Dong, Wen Bei Yu, Fan Jie Xia, Liang Dan Chen, Yun Jing Zhang, Hai Ge Tan, Liang Wu, Zhi Yi Hu, Hemdan S.H. Mohamed, Jing Liu, Zhao Deng, Yu Li, Li Hua Chen, Bao Lian Su

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

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.

langue originaleAnglais
Pages (de - à)60-69
Nombre de pages10
journalJournal of Colloid and Interface Science
Volume582
Les DOIs
Etat de la publicationPublié - 15 janv. 2021

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