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<p>In this study, 1 wt% multiwalled carbon nanotubes (MWCNTs) were added to LiNi₀.₅Mn₁.₅O₄ (LNMO) to improve its low electronic conductivity. The addition of MWCNTs enhanced the initial discharge capacity of the electrode from 127.5 to 145.2 mAh/g at a low rate of 0.1&#xa0;C. Furthermore, the capacity retention after 100 cycles at 1&#xa0;C significantly improved from 50.0% to 83.5%, demonstrating excellent cycling stability. However, contrary to expectations, the performance degraded at the high rate of 5&#xa0;C, where the capacity retention of the MWCNT-added electrode was 43.90%, even lower than that of bare LNMO (49.61%). Impedance analysis revealed that this high-rate performance degradation was due to an increase in charge-transfer resistance at the electrode interface. This is attributed to the weakened adhesion and physical delamination of the electrode material resulting from the nonuniform dispersion of the MWCNTs. This study shows that the addition of MWCNTs offers a trade-off between electronic conductivity and mechanical/interfacial stability. Therefore, designing electrodes for high-power lithium-ion batteries requires more than simple additive incorporation; optimizing MWCNT dispersion and ensuring interfacial compatibility are crucial.</p>

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Trade-off analysis of MWCNT-Added LNMO

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • San Kang,
  • Min Seo Choi,
  • Jeong H. Cho,
  • JM One,
  • J. Hyuk Kim,
  • Yun Hyeok Choi,
  • SH Lee,
  • Tae-Whan Hong,
  • Jong-Tae Son

摘要

In this study, 1 wt% multiwalled carbon nanotubes (MWCNTs) were added to LiNi₀.₅Mn₁.₅O₄ (LNMO) to improve its low electronic conductivity. The addition of MWCNTs enhanced the initial discharge capacity of the electrode from 127.5 to 145.2 mAh/g at a low rate of 0.1 C. Furthermore, the capacity retention after 100 cycles at 1 C significantly improved from 50.0% to 83.5%, demonstrating excellent cycling stability. However, contrary to expectations, the performance degraded at the high rate of 5 C, where the capacity retention of the MWCNT-added electrode was 43.90%, even lower than that of bare LNMO (49.61%). Impedance analysis revealed that this high-rate performance degradation was due to an increase in charge-transfer resistance at the electrode interface. This is attributed to the weakened adhesion and physical delamination of the electrode material resulting from the nonuniform dispersion of the MWCNTs. This study shows that the addition of MWCNTs offers a trade-off between electronic conductivity and mechanical/interfacial stability. Therefore, designing electrodes for high-power lithium-ion batteries requires more than simple additive incorporation; optimizing MWCNT dispersion and ensuring interfacial compatibility are crucial.