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<p>Achieving ultra-fast and stable charging is a critical goal for lithium-ion batteries (LIBs) in electric vehicle applications. Lithium cobalt oxide (LCO) is a prominent cathode material but is limited by low electronic conductivity and structural instability during high-rate cycling. In this study, we developed an interface engineering strategy by tailoring a single-walled carbon nanotubes (SWCNTs) top layer onto LCO electrodes using an ultrasonic spray coating technique. Polyacrylic acid (PAA) was utilized as a dispersant to ensure the de-bundling and uniform distribution of SWCNTs through synergistic steric and electrostatic effects. The thickness of the SWCNTs layer was controlled by varying the spray duration (3, 6, and 9&#xa0;min). The optimized SWCNTs layer (6&#xa0;m-SWCNT/LCO) provides a smooth surface and conductive network, which favors electron transport between LCO particles via increased electrical conductivity. Furthermore, the abundant functional groups enhance the electrode wettability, which improves Li-ion diffusion kinetics at the electrode − electrolyte interface. Accordingly, the 6&#xa0;m-SWCNT/LCO electrode exhibited superior rate capability, delivering 138.3 mAh/g at 10.0 C and demonstrating exceptional cycling stability with 80.9% capacity retention after 500 cycles at 10.0 C. Consequently, the 6&#xa0;m-SWCNT/LCO electrode represents a promising approach for interface engineering of high-performance LIBs cathodes.</p>

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Tailored single-wall carbon nanotube layer on lithium cobalt oxide for ultra-fast and ultra-stable cathodes

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Ha-Na Jang,
  • Un-Tae Kim,
  • Myeong-Hun Jo,
  • Hyo-Jin Ahn

摘要

Achieving ultra-fast and stable charging is a critical goal for lithium-ion batteries (LIBs) in electric vehicle applications. Lithium cobalt oxide (LCO) is a prominent cathode material but is limited by low electronic conductivity and structural instability during high-rate cycling. In this study, we developed an interface engineering strategy by tailoring a single-walled carbon nanotubes (SWCNTs) top layer onto LCO electrodes using an ultrasonic spray coating technique. Polyacrylic acid (PAA) was utilized as a dispersant to ensure the de-bundling and uniform distribution of SWCNTs through synergistic steric and electrostatic effects. The thickness of the SWCNTs layer was controlled by varying the spray duration (3, 6, and 9 min). The optimized SWCNTs layer (6 m-SWCNT/LCO) provides a smooth surface and conductive network, which favors electron transport between LCO particles via increased electrical conductivity. Furthermore, the abundant functional groups enhance the electrode wettability, which improves Li-ion diffusion kinetics at the electrode − electrolyte interface. Accordingly, the 6 m-SWCNT/LCO electrode exhibited superior rate capability, delivering 138.3 mAh/g at 10.0 C and demonstrating exceptional cycling stability with 80.9% capacity retention after 500 cycles at 10.0 C. Consequently, the 6 m-SWCNT/LCO electrode represents a promising approach for interface engineering of high-performance LIBs cathodes.