Fiber-reinforced CNT-integrated quartz fabrics as multifunctional electrodes for structural lithium-ion batteries

The long-term stability of lithium-ion batteries is a critical factor limiting their broader adoption in multifunctional and structural energy storage systems. However, conventional metallic current collectors tend to be heavier and less mechanically adaptable than fiber-based materials such as quartz woven fabrics (QWFs), particularly when structural integration is required. Quartz fabrics, composed primarily of silica, offer high thermal stability, mechanical robustness, and low areal weight, making them attractive candidates for multifunctional electrode platforms. In this study, carbon nanotubes (CNTs) were directly grown on QWFs via chemical vapor deposition, using Ni nanoparticles as catalysts and C₂H₄ as the carbon source. The growth process was optimized by varying temperature over a 2-h duration to form uniform, conductive CNT networks. The resulting CNT-coated QWFs functioned dually as current collectors and active electrode supports, delivering an initial discharge capacity of 201.54 mAh g^-1 at a 0.1 C-rate. The electrodes retained 89.8% of their initial capacity after 50 cycles at a 0.5 C-rate, demonstrating excellent rate capability and cycling stability, with performance nearly equivalent to that of conventional Al foil-based electrodes. Although quartz fabrics are inherently insulating, the CNT coating formed an integrated conductive network, enabling efficient charge transport while maintaining the structural integrity required for load-bearing applications. This work presents a novel fiber-based electrode design for structural lithium-ion batteries, offering a promising route toward lightweight, mechanically integrated energy storage systems suitable for advanced electronics, electric vehicles, and aerospace technologies.