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<p>It is a significant issue for lithium-ion batteries to develop hard carbon with high capacity and long cycling stability. Here, a sulfur-doped hard carbon (TT-SHC) is synthesized from thieno[3,2-b]thiophene-containing conjugated microporous polymers (TT-CMP), constructed from 1,3,5-triethynylbenzene and 3,6-dibromothieno[3,2-b]thiophene. TT-SHC is composed of nanoparticles in the range of 10–25&#xa0;nm, with large pore volume, high specific surface area, and a sulfur content of 4.74 wt%. TT-SHC displays an initial specific charge capacity of 871.3 mAh g<sup>−1</sup> at a current density of 100&#xa0;mA&#xa0;g<sup>−1</sup>. At 600&#xa0;mA&#xa0;g<sup>−1</sup>, TT-SHC delivers a charge capacity of 445.5 mAh g<sup>−1</sup> after 300 cycles, being slightly higher than the initial capacity. Such a synthesis strategy provides a new insight for the design and preparation of hard carbon.</p>

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Thieno[3,2-b]thiophene-containing conjugated microporous polymer–derived sulfur-doped hard carbon for enhanced lithium storage

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Qingtang Zhang,
  • Chenli Liang,
  • Zheng Wang,
  • Xiaomei Wang

摘要

It is a significant issue for lithium-ion batteries to develop hard carbon with high capacity and long cycling stability. Here, a sulfur-doped hard carbon (TT-SHC) is synthesized from thieno[3,2-b]thiophene-containing conjugated microporous polymers (TT-CMP), constructed from 1,3,5-triethynylbenzene and 3,6-dibromothieno[3,2-b]thiophene. TT-SHC is composed of nanoparticles in the range of 10–25 nm, with large pore volume, high specific surface area, and a sulfur content of 4.74 wt%. TT-SHC displays an initial specific charge capacity of 871.3 mAh g−1 at a current density of 100 mA g−1. At 600 mA g−1, TT-SHC delivers a charge capacity of 445.5 mAh g−1 after 300 cycles, being slightly higher than the initial capacity. Such a synthesis strategy provides a new insight for the design and preparation of hard carbon.