13October2019

Nano-Micro Letters

High-performance Na-ion Storage of S-doped Porous Carbon Derived from Conjugated Microporous Polymers

Yuquan Li1, †, Bin Ni1, †, Xiaodan Li2, Xianghui Wang1, *, Dafeng Zhang3, Qingfei Zhao5, Jinliang Li2, *, Ting Lu1, 4, *, Wenjie Mai2, Likun Pan1

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Nano-Micro Lett. (2019) 11: 60

First Online: 17 July 2019 (Article)

DOI:10.1007/s40820-019-0291-z

*Corresponding author. E-mail: xhwang@phy.ecnu.edu.cn  (Xianghui Wang); lijinliang@email.jnu.edu.cn (Jinliang Li); tlu@phy.ecnu.edu.cn (Ting Lu)

 

Abstract

 


Toc

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.


 

Keywords

Conjugated microporous polymer; S-doped porous carbons; Anode; Na-ion batteries; Reaction mechanism

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