The inherently low conductivity and substantial volume expansion of Si-based anodes lead to significant capacity degradation and poor cycling stability. Although alumina (Al2O3) coating modification can mitigate these issues, its insulating nature increases electrode resistance and its rigidity provides insufficient buffering against repeated volume changes. To address these limitations, we propose a novel strategy for growing highly flexible, conductive, and tensile strength single-walled carbon nanotubes (SWNTs) on Al2O3 coating via chemical vapor deposition (CVD). The Al2O3 coating serves a dual function as a catalyst support and a buffering layer, while preserving the structural integrity of the anode. The surface hydroxyl groups on Al2O3 act as anchoring sites for metal catalysts, preventing their aggregation. By employing Ru as the catalyst, an interconnected SWNT network was grown on Al2O3-coated SiO anodes via CVD. The composite electrode exhibits improved electronic/ionic conductivity and volume buffering capability, achieving a high initial Coulombic efficiency of 72.2 %, excellent rate capability (730 mAh g−1 at 0.2 A g−1 after cycling at 2.5 A g−1), and long-term cycling stability (540 mAh g−1 after 300 cycles at 0.2 A g−1 with ∼100 % Coulombic efficiency). Moreover, this strategy is compatible with conventional Fe, Co, or Ni catalysts, enabling cost flexibility. The Al2O3 coating also prevents catalyst-Si reactions at elevated temperatures, inhibiting inactive silicide formation and promoting SWNT growth. This work offers a versatile strategy for constructing high-performance electrodes, extending beyond Si-based anodes.
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