| 微孔共轭聚合物热解制备氮、硫杂原子硬炭及其储锂性能 |
| Preparation of Nitrogen, Sulfur Heteroatom Hard Carbon by Pyrolysis of Conjugated Microporous polymers |
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| 摘要: 选取溴代噻唑和三乙炔基苯为单体，利用聚合反应自下而上构建含噻唑共轭微孔聚合物(NSCMP)，通过热解和KOH活化热解NSCMP制备了氮、硫杂原子硬炭(NSHC)和活化NSHC(KNSHC)。利用SEM、EDS、氮气吸脱附和恒流充放电等表征两个样品的结构与电化学性能。研究表明KNSHC中N和S含量分别为10.42wt%和2.23wt%，KNSHC比表面积高达2140 m2·g-1。在0.2 A·g-1电流密度下循环500次后KNSHC和NSHC的可逆比容量分别为946.2和493.7 mAh·g-1。KNSHC的优异电化学性能归因于其独特的孔结构和氮、硫杂原子的协同作用。 |
| 关键词: 共轭微孔聚合物 硬炭 负极材料 锂离子电池 |
| 基金项目: 国家自然科学基金 |
| Abstract: A bottom-up approach was employed to build thiazole containing conjugated microporous polymer (NSCMP) by choosing bromo-thiazole and triacetylene benzene as monomers. The pyrolyzation and KOH assisted pyrolyzation of NSCMP were performed to obtain the N, S heteroatom hard carbon (NSHC) and KOH activated NSHC (KNSHC). NSHC and KNSHC were further characterized by scanning electronic microscope (SEM), energy-dispersive spectra (EDS), nitrogen adsorption/desorption test and galvanostatic charge-discharging test. The EDS reveals that the N and S contents of KNSHC are 10.42 wt% and 2.23 wt%, respectively. The specific surface area of KNSHC is as high as 2140 m2·g-1, which is distinctly higher than that of NSHC (657 m2·g-1). The specific capacity of KNSHC after 500 cycles at 0.2·A g-1 is as high as 946.2 mAh·g-1, while that of NSHC is only 493.7 mAh·g-1. The excellent electrochemical performance of KNSHC may be due to the synergistic effect of N and S heteroatoms as well as the unique porous structure. |
| Keywords: Conjugated microporous polymer Hard carbon Anode materials Lithium ion battery |
| 投稿时间：2022-05-30 修订日期：2022-10-06 |
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