High-Performance Na-Ion Storage of S-Doped Porous Carbon Derived from Conjugated Microporous Polymers

Autor: Yuquan Li, Bin Ni, Xiaodan Li, Xianghui Wang, Dafeng Zhang, Qingfei Zhao, Jinliang Li, Ting Lu, Wenjie Mai, Likun Pan
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Nano-Micro Letters, Vol 11, Iss 1, Pp 1-13 (2019)
Druh dokumentu: article
ISSN: 2311-6706
2150-5551
DOI: 10.1007/s40820-019-0291-z
Popis: Abstract Na-ion batteries (NIBs) have attracted considerable attention in recent years owing to the high abundance and low cost of Na. It is well known that S doping can improve the electrochemical performance of carbon materials for NIBs. However, the current methods for S doping in carbons normally involve toxic precursors or rigorous conditions. In this work, we report a creative and facile strategy for preparing S-doped porous carbons (SCs) via the pyrolysis of conjugated microporous polymers (CMPs). Briefly, thiophene-based CMPs served as the precursors and doping sources simultaneously. Simple direct carbonization of CMPs produced S-doped carbon materials with highly porous structures. When used as an anode for NIBs, the SCs exhibited a high reversible capacity of 440 mAh g−1 at 50 mA g−1 after 100 cycles, superior rate capability, and excellent cycling stability (297 mAh g−1 after 1000 cycles at 500 mA g−1), outperforming most S-doped carbon materials reported thus far. The excellent performance of the SCs is attributed to the expanded lattice distance after S doping. Furthermore, we employed ex situ X-ray photoelectron spectroscopy to investigate the electrochemical reaction mechanism of the SCs during sodiation–desodiation, which can highlight the role of doped S for Na-ion storage.
Databáze: Directory of Open Access Journals
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