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<p>Single-walled carbon nanotubes (SWCNTs), renowned for their excellent electrical conductivity, have long been recognized as an ideal conductive additive material. However, the high-quality and high-yield preparation of SWCNTs remains a significant challenge. In this study, we report the use of a catalyst consisting of magnesium oxide (MgO) as the substrate, with nickel (Ni) and tungsten (W) as the catalytic elements. After calcination, the catalyst formed a MgNiO₂ phase, which was then utilized in the chemical vapor deposition (CVD) method to prepare SWCNTs. The catalyst efficiency of SWCNTs reached 116% (the mass ratio of SWCNTs to catalyst). After acid treatment to remove metal impurities, the SWCNTs were incorporated as a conductive additive (5 wt%) in LiFePO₄ (LFP) lithium-ion batteries. The results demonstrate that the batteries containing this SWCNT conductive additive exhibited exceptional cycling and rate performance. At a 5 C discharge rate, the specific capacity reached 115.51 mAh/g. The capacity is still 123.93 mAh/g after 200 cycles at a 3 C discharge rate, with a retention rate of 90.90%. This test group had the lowest charge transfer impedance and the highest ion mobility rate when compared to the commercial carbon nanotubes and SuperP (SP) conductive agent control group. The findings of this study provide a simpler and more efficient method for the preparation of SWCNTs.</p>

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Synthesis of single-walled carbon nanotubes with Ni-W/MgO catalyst and their application as conductive additives in LiFePO₄ batteries

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Wei Xiong,
  • Qichuang Hu,
  • Lin Zeng,
  • Shengwen Zhong,
  • Yongzhi Wang

摘要

Single-walled carbon nanotubes (SWCNTs), renowned for their excellent electrical conductivity, have long been recognized as an ideal conductive additive material. However, the high-quality and high-yield preparation of SWCNTs remains a significant challenge. In this study, we report the use of a catalyst consisting of magnesium oxide (MgO) as the substrate, with nickel (Ni) and tungsten (W) as the catalytic elements. After calcination, the catalyst formed a MgNiO₂ phase, which was then utilized in the chemical vapor deposition (CVD) method to prepare SWCNTs. The catalyst efficiency of SWCNTs reached 116% (the mass ratio of SWCNTs to catalyst). After acid treatment to remove metal impurities, the SWCNTs were incorporated as a conductive additive (5 wt%) in LiFePO₄ (LFP) lithium-ion batteries. The results demonstrate that the batteries containing this SWCNT conductive additive exhibited exceptional cycling and rate performance. At a 5 C discharge rate, the specific capacity reached 115.51 mAh/g. The capacity is still 123.93 mAh/g after 200 cycles at a 3 C discharge rate, with a retention rate of 90.90%. This test group had the lowest charge transfer impedance and the highest ion mobility rate when compared to the commercial carbon nanotubes and SuperP (SP) conductive agent control group. The findings of this study provide a simpler and more efficient method for the preparation of SWCNTs.