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<p>Silicon-carbon composite anode materials have been widely considered for their high theoretical capacity and good cycle performance. Even though, polypyyrole, a conductive polymer, exhibits poor lithium storage performance, it can be used as both a carbon source and a nitrogen source for material carbonization and doping. This study aimed to synthesize a nitrogen-doped carbon-coated silicon/graphite (NC@Si/G) composite Anode material by high-temperature carbonization. Nitrogen-doped carbon layer is An effective way to address the ill-effect of polypyrrole in the electrode performance, and additionally, it acts synergistically with the graphite core, which inhibits volumetric expansion in silicon to produce a negative effect on the electrode performance. This two-fold task increases the cycling abilities and electrical conductivity of the anode material. The composite particles show an initial discharge specific capacity of 676.45 mAh g<sup>−1</sup> And 91.1 percent capacity remaining after 130 cycles with 6 wt% of nitrogen-doped carbon additions. This paper focuses on the cyclic stability performance enhancement mechanism of nitrogen-doped silicon-based anode materials, inspiring novel perspectives for preparing anode materials.</p>

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Polypyrrole-derived nitrogen-doped carbon-coated nanosilicon/graphite composite with enhanced cyclic stability as anode materials for lithium-ion battery

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Yanlu Lv,
  • Weichao Zhang,
  • Weibing Lv,
  • Wenping Liu,
  • Xiaoxu Lei,
  • Haiqing Qin

摘要

Silicon-carbon composite anode materials have been widely considered for their high theoretical capacity and good cycle performance. Even though, polypyyrole, a conductive polymer, exhibits poor lithium storage performance, it can be used as both a carbon source and a nitrogen source for material carbonization and doping. This study aimed to synthesize a nitrogen-doped carbon-coated silicon/graphite (NC@Si/G) composite Anode material by high-temperature carbonization. Nitrogen-doped carbon layer is An effective way to address the ill-effect of polypyrrole in the electrode performance, and additionally, it acts synergistically with the graphite core, which inhibits volumetric expansion in silicon to produce a negative effect on the electrode performance. This two-fold task increases the cycling abilities and electrical conductivity of the anode material. The composite particles show an initial discharge specific capacity of 676.45 mAh g−1 And 91.1 percent capacity remaining after 130 cycles with 6 wt% of nitrogen-doped carbon additions. This paper focuses on the cyclic stability performance enhancement mechanism of nitrogen-doped silicon-based anode materials, inspiring novel perspectives for preparing anode materials.